DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
This document discusses the design and testing of a dual-band ceramic patch antenna for use in automotive GPS applications. It aims to characterize the antenna's phase center variation and offset to enable high-precision positioning. The antenna was tested on a 250mm ground plane, integrated into a shark-fin antenna product, and mounted on a vehicle roof to measure its performance in different scenarios. The results will help estimate receiver position accurately by accounting for phase errors introduced by the antenna geometry.
SUBSIDENCE MONITORING USING THE GLOBAL POSITIONING SYSTEM(GPS)maneeb
GPS uses signals from satellites to determine position on Earth. It consists of 3 segments - space (satellites), control (monitoring satellites), and user (receivers). Receivers use trilateration of signals from 4 satellites to calculate 3D position and time. Precise positioning GPS and kinematic RTK are used to monitor subsidence by repeatedly measuring points on the ground surface. Factors like number of satellites visible and differential corrections impact accuracy.
The document provides an overview of existing radio navigation systems prior to and leading up to the development of GPS. It describes ground-based low and high frequency systems like Omega, Loran, VOR/DME, and ILS, as well as early space-based systems like Transit. It explains that higher frequency systems enable higher precision but require line-of-sight, while lower frequencies can propagate further but with lower precision. The development of GPS aimed to leverage satellites to provide worldwide coverage without line-of-sight limitations, building on lessons from prior navigation systems.
GPS Space Service Volume Increasing the Utility of GPS for ...webhostingguy
This document discusses increasing the utility of GPS for space users by defining requirements for signal availability, accuracy, and power in different orbital regimes. It outlines NASA experiments that characterized GPS performance at various altitudes and new requirements adopted for the GPS III system. These aim to standardize minimum performance for users from low Earth orbit to geosynchronous orbit, while allowing for improved accuracy through side lobe signals and objective requirements. Defining space service volume requirements enhances interoperability for civil and military space missions relying on GPS beyond low Earth orbit.
Errors and biases in GPS measurements arise from a variety of sources including satellite positions, weather, multipath, timing errors, and signal propagation through the atmosphere. These errors are broadly classified as those originating from satellites (ephemeris, clock errors), receivers (clock errors, multipath, noise), and signal propagation (ionospheric and tropospheric delays). Selective availability intentionally added error for non-authorized users until being discontinued in 2000. Differential GPS and other techniques can help reduce or eliminate some biases to achieve sub-meter accuracy.
GPS Instrumental Biases Estimation Using Continuous Operating Receivers NetworkCSCJournals
Precise Total Electron Content (TEC) are required to produce accurate spatial and temporal resolution of Global Ionosphere Maps (GIMs). Receivers and Satellites Instrumental Biases (IBs) are one of the main error sources in estimating precise TEC from Global Positioning Systems (GPS) data. Recently, researchers are interested in developing models and algorithms to compute IBs of receivers and satellites close to those computed from the Ionosphere Associated Analysis Centers (IAAC). Here we introduce a MATLAB code called Multi Station IBs Estimation (MSIBE) to calculate satellites and codeless tracking receivers IBs from GPS data. MSIBE based on spherical harmonic function and geometry free combination of GPS carrier phase and pseudo-range code observations and weighted least square were applied to solve observation equations, to improve estimation of IBs values. There are many factors affecting estimated value of IBs. The premier factor is the observations weighting function which relying on the satellite elevation angle. The second factor concerned with estimating IBs using single GPS Station Precise Point Positioning (PPP) or using GPS network. The third factor is the number of GPS receivers in the network. Results from MSIBE were evaluated and compared with data from IAAC and other codes like M_DCB and ZDDCBE. The results of weighted (MSIBE) least square shows an improvement for estimated IBs, where mean differences from CODE less than 0.746 ns. IBs estimated from Continuous Operating Receivers (CORs) GPS network shows a good agreement with IAAC than IBs estimated from PPP where the mean differences are less than 0.1477 ns and 1.1866 ns, respectively. The mean differences of computed IBs improved by increasing number of GPS stations in the network.
GPS processing techniques & some applicationsVrince Vimal
The document discusses GPS processing techniques, including pseudo-range processing and carrier-phase measurements. Pseudo-ranges are a measure of distance between a GPS receiver and satellite based on the time shift needed to align code signals. Carrier-phase measurements provide even higher precision but require resolving the integer cycle ambiguity. Methods for ambiguity resolution include receiver initialization, antenna swapping, and on-the-fly processing. Good satellite geometry as measured by dilution of precision (DOP) helps improve positioning accuracy. Applications discussed include surveying, geographical positioning, control networks, and determining heights and the geoid.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
This document discusses the design and testing of a dual-band ceramic patch antenna for use in automotive GPS applications. It aims to characterize the antenna's phase center variation and offset to enable high-precision positioning. The antenna was tested on a 250mm ground plane, integrated into a shark-fin antenna product, and mounted on a vehicle roof to measure its performance in different scenarios. The results will help estimate receiver position accurately by accounting for phase errors introduced by the antenna geometry.
SUBSIDENCE MONITORING USING THE GLOBAL POSITIONING SYSTEM(GPS)maneeb
GPS uses signals from satellites to determine position on Earth. It consists of 3 segments - space (satellites), control (monitoring satellites), and user (receivers). Receivers use trilateration of signals from 4 satellites to calculate 3D position and time. Precise positioning GPS and kinematic RTK are used to monitor subsidence by repeatedly measuring points on the ground surface. Factors like number of satellites visible and differential corrections impact accuracy.
The document provides an overview of existing radio navigation systems prior to and leading up to the development of GPS. It describes ground-based low and high frequency systems like Omega, Loran, VOR/DME, and ILS, as well as early space-based systems like Transit. It explains that higher frequency systems enable higher precision but require line-of-sight, while lower frequencies can propagate further but with lower precision. The development of GPS aimed to leverage satellites to provide worldwide coverage without line-of-sight limitations, building on lessons from prior navigation systems.
GPS Space Service Volume Increasing the Utility of GPS for ...webhostingguy
This document discusses increasing the utility of GPS for space users by defining requirements for signal availability, accuracy, and power in different orbital regimes. It outlines NASA experiments that characterized GPS performance at various altitudes and new requirements adopted for the GPS III system. These aim to standardize minimum performance for users from low Earth orbit to geosynchronous orbit, while allowing for improved accuracy through side lobe signals and objective requirements. Defining space service volume requirements enhances interoperability for civil and military space missions relying on GPS beyond low Earth orbit.
Errors and biases in GPS measurements arise from a variety of sources including satellite positions, weather, multipath, timing errors, and signal propagation through the atmosphere. These errors are broadly classified as those originating from satellites (ephemeris, clock errors), receivers (clock errors, multipath, noise), and signal propagation (ionospheric and tropospheric delays). Selective availability intentionally added error for non-authorized users until being discontinued in 2000. Differential GPS and other techniques can help reduce or eliminate some biases to achieve sub-meter accuracy.
GPS Instrumental Biases Estimation Using Continuous Operating Receivers NetworkCSCJournals
Precise Total Electron Content (TEC) are required to produce accurate spatial and temporal resolution of Global Ionosphere Maps (GIMs). Receivers and Satellites Instrumental Biases (IBs) are one of the main error sources in estimating precise TEC from Global Positioning Systems (GPS) data. Recently, researchers are interested in developing models and algorithms to compute IBs of receivers and satellites close to those computed from the Ionosphere Associated Analysis Centers (IAAC). Here we introduce a MATLAB code called Multi Station IBs Estimation (MSIBE) to calculate satellites and codeless tracking receivers IBs from GPS data. MSIBE based on spherical harmonic function and geometry free combination of GPS carrier phase and pseudo-range code observations and weighted least square were applied to solve observation equations, to improve estimation of IBs values. There are many factors affecting estimated value of IBs. The premier factor is the observations weighting function which relying on the satellite elevation angle. The second factor concerned with estimating IBs using single GPS Station Precise Point Positioning (PPP) or using GPS network. The third factor is the number of GPS receivers in the network. Results from MSIBE were evaluated and compared with data from IAAC and other codes like M_DCB and ZDDCBE. The results of weighted (MSIBE) least square shows an improvement for estimated IBs, where mean differences from CODE less than 0.746 ns. IBs estimated from Continuous Operating Receivers (CORs) GPS network shows a good agreement with IAAC than IBs estimated from PPP where the mean differences are less than 0.1477 ns and 1.1866 ns, respectively. The mean differences of computed IBs improved by increasing number of GPS stations in the network.
GPS processing techniques & some applicationsVrince Vimal
The document discusses GPS processing techniques, including pseudo-range processing and carrier-phase measurements. Pseudo-ranges are a measure of distance between a GPS receiver and satellite based on the time shift needed to align code signals. Carrier-phase measurements provide even higher precision but require resolving the integer cycle ambiguity. Methods for ambiguity resolution include receiver initialization, antenna swapping, and on-the-fly processing. Good satellite geometry as measured by dilution of precision (DOP) helps improve positioning accuracy. Applications discussed include surveying, geographical positioning, control networks, and determining heights and the geoid.
The document discusses GPS receivers and positioning methods. It provides details on:
- How GPS receivers obtain data from at least 4 satellites to determine position through measuring pseudo-ranges or carrier phase.
- Modern receivers can track all visible satellites simultaneously through multiple channels.
- Basic positioning involves measuring distances to 3 satellites, but using 4 eliminates clock bias errors.
- Carrier phase measurements provide more accurate positioning needed for engineering surveys.
This document provides an overview of the Global Positioning System (GPS). It discusses what GPS is, its evolution, how it works, and its three segments: the space segment consisting of 24 satellites, the control segment of 5 ground stations, and the user segment of GPS receivers. The document outlines the information contained in GPS signals, how triangulation is used to determine position, and sources of errors like the ionosphere. It also discusses differential GPS, applications of GPS, and concludes with a bibliography.
1. The document discusses various topics related to GPS signals including transmitting frequencies, codes, ionospheric and tropospheric effects, and linear combinations of observations.
2. It explains the C/A and P codes transmitted by GPS satellites, and how their phases are related. Doppler shift from satellite motion is also discussed.
3. Different types of single, double, and triple differences between receiver and satellite observations are defined, which help eliminate various error sources. Cycle slips which cause discontinuities are also summarized.
Global Navigation Satellite System (GNSS) allows mappers and resource managers to locate features using satellite positioning. GNSS receivers determine position by measuring distances to at least 4 satellites via signal travel time. Accuracy is typically 10-20 meters but can be improved to 1-5 meters using real-time differential corrections which account for errors. GNSS data can be incorporated into a GIS by converting point, line and polygon features collected using GNSS receivers.
GPS uses a constellation of satellites and ground stations to provide location and time information to receivers. It operates in three segments: the space segment consisting of satellites, the control segment of ground stations that monitor the satellites, and the user segment of GPS receivers. GPS works by precisely measuring the time for signals to travel from satellites to a receiver, allowing the receiver to triangulate its position using signals from at least three satellites. Sources of error include factors like atmospheric conditions and receiver noise, but accuracy is improved using techniques like differential GPS which corrects errors.
Remote sensing and GIS are useful tools for civil engineering projects. The Global Positioning System (GPS) uses 24 satellites that orbit the earth to provide location and time information to GPS receivers. It has three segments: space (satellites), control (monitoring stations), and user (receivers). GPS works by precisely measuring the time it takes signals from multiple satellites to reach a receiver, allowing the device to triangulate its position. Its applications include navigation, mapping, precision agriculture, and more. Other global satellite systems include GLONASS, Galileo, BeiDou, and future systems like Compass.
This document provides an overview of the global positioning system (GPS). It discusses the history of GPS, describing how it was first introduced and used by the US Navy in 1960. The structure and basic concepts of the GPS system are explained, noting how GPS satellites transmit signals that allow receivers to precisely calculate their position by timing the signals. Applications of GPS are reviewed, such as in car, airplane, and ship navigation systems. Advantages and disadvantages of GPS are also summarized. The document concludes with an index of the topics covered.
The document provides an overview of the Global Positioning System (GPS) including its history, components, functionality, accuracy, sources of error, and differential correction technologies. It describes the three segments that make up GPS (space, control, and user), how positioning is determined through satellite signal time measurements, common applications, and factors that influence accuracy such as satellite geometry and atmospheric effects.
The document discusses the integration of inertial navigation systems (INS) and global positioning systems (GPS) to improve navigation accuracy, especially in urban areas. It outlines the history and different architectures for INS-GPS integration, and describes a research study that implemented tight coupling using a Kalman filter to post-process data from a low-cost INS and differential GPS during field tests in Nottingham, finding substantial accuracy improvements from the smoothing algorithm. The conclusions determined that integrated GPS and low-cost INS systems can meet performance needs for applications like surveying where satellite availability is restricted.
Satellite navigation systems use satellites to allow receivers to determine their precise location using time signals from satellites. Global Navigation Satellite Systems (GNSS) provide global coverage and include GPS, GLONASS, Galileo, BeiDou, and IRNSS. Regional systems augment global systems to improve accuracy through corrections broadcast by geostationary satellites.
This document summarizes navigation and address location. It discusses the history and principles of navigation, including the development of GPS. It describes the main functional categories in navigation such as positioning, route planning, route guidance, map display, and address location. It provides details on how each function works, including examples of positioning, route planning algorithms, and map display features.
This document discusses GPS error sources and techniques for improving GPS accuracy, including:
- The troposphere causes delays in GPS signals and is a source of error. Techniques like WAAS and LAAS use reference stations and satellites to correct for tropospheric delays.
- Good satellite geometry with low PDOP provides the most accurate GPS positioning. Dilution of precision metrics like PDOP indicate satellite geometry quality.
- Ambiguity resolution techniques using dual or triple frequency carrier phase and code data can fix integer ambiguities and improve positioning accuracy to centimeter-level.
GPS is a global navigation satellite system that provides location and time information to GPS receivers anywhere on Earth. It consists of three segments - the space segment with 24 satellites orbiting Earth, the control segment of ground stations that monitor the satellites, and the user segment of GPS receivers used by individuals. GPS works by precisely measuring the travel time of signals from multiple satellites to triangulate the receiver's position. It provides accurate positioning 24/7 globally and has many applications including navigation, mapping, and tracking.
Sentinel-4 and Sentinel-5 will be satellites dedicated to monitoring atmospheric composition as part of the European Union's GMES program. Sentinel-4 will launch in 2018 onboard the MTG-S satellite, while Sentinel-5 will launch in 2018+ onboard the MetOp-SG satellite. Both missions aim to measure key atmospheric gases and aerosols to support air quality monitoring and climate change research.
survey method "Tendua Geo-Special & Construction (OPC) Private Limited"HimanshuSinghGaharwa
The document provides an overview of the Global Positioning System (GPS) including its three segments and how it determines position. It discusses the early methods of celestial navigation and development of satellite navigation systems like TRANSIT. It describes how the 24-satellite GPS constellation works along with the control and user segments. It summarizes positioning methods like absolute and differential GPS and applications such as navigation, surveying, mapping and timing.
The document provides an introduction to the NAVSTAR GPS system, including its history, components, and functions. It describes the three segments (space, control, and user), how GPS determines position via satellite timing signals, sources of error, and applications for civilian and military use. It also covers differential GPS techniques which improve accuracy, such as WAAS.
This document describes the Wide Aperture Reflection and Refraction Profiling (WARRP) seismic method. WARRP utilizes both refracted and wide-angle reflected seismic waves to develop a detailed velocity-depth model with precisely defined velocities and interface geometries. It allows the construction of very long seismic arrays on land or offshore using autonomous recording units. This provides high-resolution travel time data and penetration to greater depths than conventional methods. The document outlines the WARRP data acquisition, processing, velocity modeling, dynamic modeling, and migration techniques to obtain accurate subsurface images.
Current & Future Spaceborne Sar Systemsgpetrie
This document summarizes current and future spaceborne synthetic aperture radar (SAR) systems. It reviews SAR systems by wavelength/frequency used and resulting ground resolution, including X-band, C-band, S-band, and L-band systems. It describes technological developments that have enabled smaller, less expensive SAR satellites. Many countries have recently launched or plan to launch X-band SAR satellites for civil and military use. Continuity of C-band SAR is ensured by Radarsat-2 and upcoming RISAT and Sentinel-1.
Global positioning system and its mathematical form.
By Mustahsan Khan _ BS(physics-Nanotechnology) (International Islamic University Islamabad) Pakistan.
Accuracy improvement of gnss and real time kinematic using egyptian network a...Alexander Decker
1) The document discusses improving the accuracy of differential GNSS and real-time kinematic (RTK) using the Egyptian network as a case study.
2) It investigates an integrated system to reduce orbital, ionospheric, and tropospheric errors affecting GNSS measurements.
3) The results of the study include an analysis of the improved accuracy achieved by the integrated system using precise ephemerides, ionosphere modeling, and troposphere modeling, as well as a comparison of DGPS and RTK solutions for the Egyptian network coordinates.
This document presents a study on designing a model-based controller for two interacting conical tank level systems. The system is highly nonlinear. It first develops mathematical models for the system using mass and energy balance equations. The nonlinear system is linearized around four operating regions. An internal model controller is designed for each region using the process models. Simulation results in MATLAB Simulink show that the internal model controller is able to maintain the liquid levels at the set points and reject disturbances effectively for all four regions of operation. The controller provides good performance without oscillation or slow settling times.
Scan-Based Delay Measurement Technique Using Signature RegistersIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
The document discusses GPS receivers and positioning methods. It provides details on:
- How GPS receivers obtain data from at least 4 satellites to determine position through measuring pseudo-ranges or carrier phase.
- Modern receivers can track all visible satellites simultaneously through multiple channels.
- Basic positioning involves measuring distances to 3 satellites, but using 4 eliminates clock bias errors.
- Carrier phase measurements provide more accurate positioning needed for engineering surveys.
This document provides an overview of the Global Positioning System (GPS). It discusses what GPS is, its evolution, how it works, and its three segments: the space segment consisting of 24 satellites, the control segment of 5 ground stations, and the user segment of GPS receivers. The document outlines the information contained in GPS signals, how triangulation is used to determine position, and sources of errors like the ionosphere. It also discusses differential GPS, applications of GPS, and concludes with a bibliography.
1. The document discusses various topics related to GPS signals including transmitting frequencies, codes, ionospheric and tropospheric effects, and linear combinations of observations.
2. It explains the C/A and P codes transmitted by GPS satellites, and how their phases are related. Doppler shift from satellite motion is also discussed.
3. Different types of single, double, and triple differences between receiver and satellite observations are defined, which help eliminate various error sources. Cycle slips which cause discontinuities are also summarized.
Global Navigation Satellite System (GNSS) allows mappers and resource managers to locate features using satellite positioning. GNSS receivers determine position by measuring distances to at least 4 satellites via signal travel time. Accuracy is typically 10-20 meters but can be improved to 1-5 meters using real-time differential corrections which account for errors. GNSS data can be incorporated into a GIS by converting point, line and polygon features collected using GNSS receivers.
GPS uses a constellation of satellites and ground stations to provide location and time information to receivers. It operates in three segments: the space segment consisting of satellites, the control segment of ground stations that monitor the satellites, and the user segment of GPS receivers. GPS works by precisely measuring the time for signals to travel from satellites to a receiver, allowing the receiver to triangulate its position using signals from at least three satellites. Sources of error include factors like atmospheric conditions and receiver noise, but accuracy is improved using techniques like differential GPS which corrects errors.
Remote sensing and GIS are useful tools for civil engineering projects. The Global Positioning System (GPS) uses 24 satellites that orbit the earth to provide location and time information to GPS receivers. It has three segments: space (satellites), control (monitoring stations), and user (receivers). GPS works by precisely measuring the time it takes signals from multiple satellites to reach a receiver, allowing the device to triangulate its position. Its applications include navigation, mapping, precision agriculture, and more. Other global satellite systems include GLONASS, Galileo, BeiDou, and future systems like Compass.
This document provides an overview of the global positioning system (GPS). It discusses the history of GPS, describing how it was first introduced and used by the US Navy in 1960. The structure and basic concepts of the GPS system are explained, noting how GPS satellites transmit signals that allow receivers to precisely calculate their position by timing the signals. Applications of GPS are reviewed, such as in car, airplane, and ship navigation systems. Advantages and disadvantages of GPS are also summarized. The document concludes with an index of the topics covered.
The document provides an overview of the Global Positioning System (GPS) including its history, components, functionality, accuracy, sources of error, and differential correction technologies. It describes the three segments that make up GPS (space, control, and user), how positioning is determined through satellite signal time measurements, common applications, and factors that influence accuracy such as satellite geometry and atmospheric effects.
The document discusses the integration of inertial navigation systems (INS) and global positioning systems (GPS) to improve navigation accuracy, especially in urban areas. It outlines the history and different architectures for INS-GPS integration, and describes a research study that implemented tight coupling using a Kalman filter to post-process data from a low-cost INS and differential GPS during field tests in Nottingham, finding substantial accuracy improvements from the smoothing algorithm. The conclusions determined that integrated GPS and low-cost INS systems can meet performance needs for applications like surveying where satellite availability is restricted.
Satellite navigation systems use satellites to allow receivers to determine their precise location using time signals from satellites. Global Navigation Satellite Systems (GNSS) provide global coverage and include GPS, GLONASS, Galileo, BeiDou, and IRNSS. Regional systems augment global systems to improve accuracy through corrections broadcast by geostationary satellites.
This document summarizes navigation and address location. It discusses the history and principles of navigation, including the development of GPS. It describes the main functional categories in navigation such as positioning, route planning, route guidance, map display, and address location. It provides details on how each function works, including examples of positioning, route planning algorithms, and map display features.
This document discusses GPS error sources and techniques for improving GPS accuracy, including:
- The troposphere causes delays in GPS signals and is a source of error. Techniques like WAAS and LAAS use reference stations and satellites to correct for tropospheric delays.
- Good satellite geometry with low PDOP provides the most accurate GPS positioning. Dilution of precision metrics like PDOP indicate satellite geometry quality.
- Ambiguity resolution techniques using dual or triple frequency carrier phase and code data can fix integer ambiguities and improve positioning accuracy to centimeter-level.
GPS is a global navigation satellite system that provides location and time information to GPS receivers anywhere on Earth. It consists of three segments - the space segment with 24 satellites orbiting Earth, the control segment of ground stations that monitor the satellites, and the user segment of GPS receivers used by individuals. GPS works by precisely measuring the travel time of signals from multiple satellites to triangulate the receiver's position. It provides accurate positioning 24/7 globally and has many applications including navigation, mapping, and tracking.
Sentinel-4 and Sentinel-5 will be satellites dedicated to monitoring atmospheric composition as part of the European Union's GMES program. Sentinel-4 will launch in 2018 onboard the MTG-S satellite, while Sentinel-5 will launch in 2018+ onboard the MetOp-SG satellite. Both missions aim to measure key atmospheric gases and aerosols to support air quality monitoring and climate change research.
survey method "Tendua Geo-Special & Construction (OPC) Private Limited"HimanshuSinghGaharwa
The document provides an overview of the Global Positioning System (GPS) including its three segments and how it determines position. It discusses the early methods of celestial navigation and development of satellite navigation systems like TRANSIT. It describes how the 24-satellite GPS constellation works along with the control and user segments. It summarizes positioning methods like absolute and differential GPS and applications such as navigation, surveying, mapping and timing.
The document provides an introduction to the NAVSTAR GPS system, including its history, components, and functions. It describes the three segments (space, control, and user), how GPS determines position via satellite timing signals, sources of error, and applications for civilian and military use. It also covers differential GPS techniques which improve accuracy, such as WAAS.
This document describes the Wide Aperture Reflection and Refraction Profiling (WARRP) seismic method. WARRP utilizes both refracted and wide-angle reflected seismic waves to develop a detailed velocity-depth model with precisely defined velocities and interface geometries. It allows the construction of very long seismic arrays on land or offshore using autonomous recording units. This provides high-resolution travel time data and penetration to greater depths than conventional methods. The document outlines the WARRP data acquisition, processing, velocity modeling, dynamic modeling, and migration techniques to obtain accurate subsurface images.
Current & Future Spaceborne Sar Systemsgpetrie
This document summarizes current and future spaceborne synthetic aperture radar (SAR) systems. It reviews SAR systems by wavelength/frequency used and resulting ground resolution, including X-band, C-band, S-band, and L-band systems. It describes technological developments that have enabled smaller, less expensive SAR satellites. Many countries have recently launched or plan to launch X-band SAR satellites for civil and military use. Continuity of C-band SAR is ensured by Radarsat-2 and upcoming RISAT and Sentinel-1.
Global positioning system and its mathematical form.
By Mustahsan Khan _ BS(physics-Nanotechnology) (International Islamic University Islamabad) Pakistan.
Accuracy improvement of gnss and real time kinematic using egyptian network a...Alexander Decker
1) The document discusses improving the accuracy of differential GNSS and real-time kinematic (RTK) using the Egyptian network as a case study.
2) It investigates an integrated system to reduce orbital, ionospheric, and tropospheric errors affecting GNSS measurements.
3) The results of the study include an analysis of the improved accuracy achieved by the integrated system using precise ephemerides, ionosphere modeling, and troposphere modeling, as well as a comparison of DGPS and RTK solutions for the Egyptian network coordinates.
This document presents a study on designing a model-based controller for two interacting conical tank level systems. The system is highly nonlinear. It first develops mathematical models for the system using mass and energy balance equations. The nonlinear system is linearized around four operating regions. An internal model controller is designed for each region using the process models. Simulation results in MATLAB Simulink show that the internal model controller is able to maintain the liquid levels at the set points and reject disturbances effectively for all four regions of operation. The controller provides good performance without oscillation or slow settling times.
Scan-Based Delay Measurement Technique Using Signature RegistersIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Fatigue Analysis of Acetylene converter reactorIJMER
The structural integrity of mechanical components during several transients should be
assured in the design stage. This requires a fatigue analysis including thermal and structural analysis. As
an example, this study performs a fatigue analysis of the acetylene converter reactor during arbitrary
transients. Using heat transfer coefficients determined based on the operating environments, a transient
thermal analysis is performed and the results are applied to a finite element model along with the
pressure to calculate the stresses. The total stress intensity range and cumulative fatigue usage factor are
investigated to determine the adequacy of the design.
Removal of Clutter by Using Wavelet Transform For Wind ProfilerIJMER
ABSTRACT: Removal of clutter in the radar wind profiler
is the utmost important consideration in radar. Wavelet
transform is very effective method to remove the clutter.
This paper presents a technique based on the wavelet
transform to remove the clutter. In this technique we used
Fourier transform and descrete wavelet transform after
that applied inverse discrete wavelet transform for signal.
These techniques applied for inphase and quadrature
phase, total spectrum and single range gate. Very
encouraging results got with this technique that have
shown practical possibilities for a real time
implementation and for applications related to frequency
domain.
Keywords: Wind profiler, wavelet transform, Fourier transform, clutter, signal processing
This document discusses the different types of diabetes, including Type 1, Type 2, and gestational diabetes. It covers the symptoms, causes, treatment options, and management of diabetes through diet, exercise, and medication. The key points are that there are different types of diabetes, symptoms can include frequent urination and thirst, and treatment involves monitoring blood sugar levels through diet, exercise, and insulin or other medication.
Este documento describe los fundamentos y clasificación de las eflorescencias en ladrillos de construcción. Explica que las eflorescencias son depósitos de sales solubles que aparecen en la superficie de los ladrillos, reduciendo su calidad estética. Los tipos y causas de eflorescencias son diversos y están influenciados por múltiples factores como la migración de sales, la capacidad de absorción de agua del ladrillo, y las condiciones ambientales. Finalmente, detalla las sales solubles más comunes que causan eflorescencias
Effect of Air Entrainment on Compressive Strength, Density, and Ingredients o...IJMER
The micro air bubbles in concrete mix act as fine aggregates which lead to reduction of the
aggregates. The reduction of fine aggregates will cause reduction of water required for concrete mix
without impairing the strength of concrete mix. This reduction has to be considered in designing an air
entrained concrete mix. Theoretical (equations) and experimental study have been carried out to study the
effect of air entrainment on compressive strength, density and ingredients of fresh concrete mix. During
all the study, water cement ratio (w/c) was maintained constant at 0.5 to study the affection of air
entrainment (a %) on concrete mix. The results have shown substantial decreasing in cement, water,
aggregates and concrete density followed with decreasing in compressive strength of concrete. The results
of this study has given more promising to use it as a guide for concrete mix design to choose the most
appropriate concrete mix design economically.
On some locally closed sets and spaces in Ideal Topological SpacesIJMER
This document introduces and studies the concept of δˆ s-locally closed sets in ideal topological spaces. Some key points:
- A subset A is δˆ s-locally closed if A can be written as the intersection of a δˆ s-open set and a δˆ s-closed set.
- Various properties of δˆ s-locally closed sets are introduced and characterized, including relationships to other concepts like generalized locally closed sets.
- It is shown that a subset A is δˆ s-locally closed if and only if A can be written as the intersection of a δˆ s-open set and the δˆ s-closure of A.
- Theore
This document summarizes a study on the finite element analysis and design of experiments of a parabolic leaf spring for a mini loader truck. The leaf spring was modeled in CATIA V5 and analyzed for maximum von Mises stress and displacement. Design of experiments was conducted by varying the camber and eye distance. The results showed that increasing camber decreases displacement while increasing stress, and increasing eye distance increases both displacement and stress. The optimum leaf spring dimensions can be determined from the design of experiments analysis.
Wavelet Based Analysis of Online Monitoring of Electrical Power by Mobile Tec...IJMER
Electrical automation is an important option for obtaining optimal solution while monitoring the electrical power consumption. While using the conventional methods the errors in continuous monitoring of power consumption is more. But the system requires not only the monitoring of the energy but also requires the analysis of the monitored energy. In this paper wavelet analysis is used for the analysis of the monitored energy/power which is monitored by GPRS technology. By using the GPRS mobile technology the energy consumption is monitored continuously and the observed data is interfaced to the computer by RS 232 port. By using MATLAB the monitored data is processed to obtain in depth analysis of the monitored power. The proposed method not only monitors the data but also provides efficient means to analyze the observed data by Wavelet Transform
Numerical Investigation of Multilayer Fractal FSSIJMER
Numerical investigations are presented for a multilayer frequency selective surface with Koch
fractal (levels 1 and 2) conducting patch elements. The structure investigated is obtained using two FSS
screens separated by an air gap layer. For the proposed investigation were used three different values an
air gap height. The results obtained using the numerical method were compared with other technique and
using the commercial software Ansoft DesignerTM. A good agreement was observed in terms of the
bandwidth.
This document announces Windows 8 app labs and camps to help people build their first Windows Store apps. It lists storytellers and organizers for the events, including Kristof Rennen and Elise Daans from AppStory, as well as links and Twitter handles for AppStory and other organizers like MADN and AZUG. The camps will teach absolute beginners how to build Windows Store apps with C#.
The Minimum Cost Forwarding Using MAC Protocol for Wireless Sensor NetworksIJMER
The document discusses the Minimum Cost Forwarding (MCF) routing protocol for wireless sensor networks. MCF establishes optimal routing paths with few message exchanges and is scalable and simple to implement. The authors formally model MCF as timed automata and use model checking to verify its properties. Their analysis identified weaknesses in MCF concerning equal-cost paths and node failures. The authors present improvements to address deficiencies in the original MCF protocol.
This document discusses the synthesis of nano materials using sputtering. It first provides background on nanomaterials and describes electron beam lithography and sputtering processes. The document then details an experiment where alumina and silica nano materials were synthesized. Electron beam lithography was used to create a pattern on a resist-coated wafer, which was then subjected to sputtering deposition of alumina and silica. Scanning electron microscopy and atomic force microscopy characterization revealed uniformly distributed 50nm cubes with good adhesive properties and low surface roughness.
Performance Analysis of Trust-Aware Routing Framework for Wireless Mesh NetworksIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
PV/Diesel Hybrid System for Fuel Production from Waste Plastics RecyclingIJMER
The treatment of wastes has become one of the most important concerns of modern society. Converting waste plastic into gasoline and diesel fuel through a highly effective low-cost pyrolysis process is a promising technology. In this paper PV/Diesel/Battery hybrid system is suggested to fulfill the load demand of waste plastic recycling pyrolysis process. A Mathematical and simulation models using MATLAB/ SIMULINK software for the hybrid PV/Diesel/Battery system components have been developed. Also, this paper presents a control strategy using Artificial Neural Network Controller
(NNC) technique for coordinating the power flow among the different components of the PV/Diesel/Battery hybrid system. The results indicate that the proposed control unit using NNC can be successfully used for controlling the power system for the waste plastic recycling pyrolysis process.
Mitigation of Fault in the Distribution System by using Flexible Distributed ...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
An Efficient System for Traffic Control in Networks Using Virtual Routing Top...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
High Performance Germanium Double Gate N-MOSFETIJMER
The current MOSFET technology supports scaling down to nanometer. To achieve
enhanced transistor switching, it is difficult to keep the equivalent driver current at the same level
since it changes by the certain restrictions like effective masses, density of states, uniaxial- and
biaxial- strain; band structure, channel orientation, channel mobility, off-state leakage, switching
delay in nano-scale and parasitic latch up. Current strained-Si is the ruling technology for
intensifying the performance of MOSFET and development of strain can provide a better solution to
the scaling. The future of nano-scale MOSFETs relies on exploration of novel higher mobility channel
materials such as stained-Ge and strained III-V groups that might perform even better than very
highly strained-Si. In addition, parameters such as injection velocity, short channel length effect and
Band-to-Band Tunneling (BTBT) result in reduction of inversion charge, increase in leakage current,
resulting in decrease in the drive current. While developing accurate model of MOSFETs all these
complex effects should be captured. It is proposed to
1. Design high performance double gate n-MOSFET with channel material Ge.
2. Benchmarked & stimulate high performance double gate n-MOSFET by using the simulation
techniques.
This document discusses generalized closed sets in topological spaces. It begins by introducing several types of generalized closed sets that have been defined in previous literature, such as g-closed sets, sg-closed sets, gs-closed sets, etc. It then defines a new type of generalized closed set called a g*s-closed set, which is a subset A such that the semi-closure of A is contained in every g-open set containing A. Examples are provided to illustrate g*s-closed sets. Properties of g*s-closed sets are discussed, such as every semi-closed set being g*s-closed, but the converse is not true. The relationship between g*s-closed sets and other
This document discusses GPS systems and how they work. It begins with defining GPS as the Global Positioning System, which uses satellites and radio signals to pinpoint a receiver's location anywhere in the world. It then discusses where GPS is used, including for military and civilian navigation, and how GPS works by measuring distances to multiple satellites. The document also provides details on GPS satellite locations and movements, the radio frequencies used, and how GPS receivers use timing data from satellites to triangulate their position. It concludes with an example of a GPS circuit using a PIC microcontroller.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
High-accuracy Global Navigation Satellite System (GNSS) positioning is a prospective technology that will be used in future automotive navigation systems. This system will be a composite of the United States' Global Positioning System (GPS), the Russian Federation's Global Orbiting Navigation Satellite System (GLONASS), China Beidou Navigation Satellite System (BDS) and the European Union’s Galileo. The major improvement in accuracy and precision is based on (1) multiband signal transmitting, (2) carrier phase correction, (3) Real Time Kinematic (RTK). Due to the size and high-cost of today’s survey-grade antenna solutions, this kind of technology is difficult to use widely in the automotive sector. In this paper, a low-cost small size dual-band ceramic GNSS patch antenna is presented from design to real sample. A further study of this patch antenna illustrates the absolute phase center variation measured in an indoor range to achieve a received signal phase error correction. In addition, this low-cost antenna solution is investigated when integrated into a standard multi-band automotive antenna product. This product is evaluated both on its own in an indoor range and on a typical vehicle roof at an outdoor range. By using this evaluation file to estimate the receiver position could achieve phase motion error-free result.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
High-accuracy Global Navigation Satellite System (GNSS) positioning is a prospective technology that will be used in future automotive navigation systems. This system will be a composite of the United States' Global Positioning System (GPS), the Russian Federation's Global Orbiting Navigation Satellite System (GLONASS), China Beidou Navigation Satellite System (BDS) and the European Union’s Galileo. The major improvement in accuracy and precision is based on (1) multiband signal transmitting, (2) carrier phase correction, (3) Real Time Kinematic (RTK). Due to the size and high-cost of today’s survey-grade antenna solutions, this kind of technology is difficult to use widely in the automotive sector. In this paper, a low-cost small size dual-band ceramic GNSS patch antenna is presented from design to real sample. A further study of this patch antenna illustrates the absolute phase center variation measured in an indoor range to achieve a received signal phase error correction. In addition, this low-cost antenna solution is investigated when integrated into a standard multi-band automotive antenna product. This product is evaluated both on its own in an indoor range and on a typical vehicle roof at an outdoor range. By using this evaluation file to estimate the receiver position could achieve phase motion error-free result.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
High-accuracy Global Navigation Satellite System (GNSS) positioning is a prospective technology that will be used in future automotive navigation systems. This system will be a composite of the United States' Global Positioning System (GPS), the Russian Federation's Global Orbiting Navigation Satellite System (GLONASS), China Beidou Navigation Satellite System (BDS) and the European Union’s Galileo. The major improvement in accuracy and precision is based on (1) multiband signal transmitting, (2) carrier phase correction, (3) Real Time Kinematic (RTK). Due to the size and high-cost of today’s survey-grade antenna solutions, this kind of technology is difficult to use widely in the automotive sector. In this paper, a low-cost small size dual-band ceramic GNSS patch antenna is presented from design to real sample. A further study of this patch antenna illustrates the absolute phase center variation measured in an indoor range to achieve a received signal phase error correction. In addition, this low-cost antenna solution is investigated when integrated into a standard multi-band automotive antenna product. This product is evaluated both on its own in an indoor range and on a typical vehicle roof at an outdoor range. By using this evaluation file to estimate the receiver position could achieve phase motion error-free result.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
This document discusses the design and evaluation of a dual-band ceramic GNSS patch antenna for automotive applications. It aims to characterize the antenna's phase center variation and offset to achieve carrier phase correction and improve positioning accuracy. The antenna was evaluated on a 250mm ground plane, integrated into a shark-fin antenna on the same ground plane, and mounted on a vehicle roof. The results from indoor and outdoor testing can be used to estimate receiver position with reduced phase error for different vehicle platforms and antenna locations.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
This document discusses the design and testing of a dual-band ceramic patch antenna for use in automotive GPS applications. It aims to characterize the antenna's phase center variation and offset to enable high-precision positioning. The antenna was tested on a 250mm ground plane, integrated into a shark-fin antenna product, and mounted on a vehicle roof to measure its performance in different scenarios. The results will help estimate receiver position accurately by accounting for phase errors introduced by the antenna geometry.
DUAL BAND GNSS ANTENNA PHASE CENTER CHARACTERIZATION FOR AUTOMOTIVE APPLICATIONSjantjournal
High-accuracy Global Navigation Satellite System (GNSS) positioning is a prospective technology that will
be used in future automotive navigation systems. This system will be a composite of the United States'
Global Positioning System (GPS), the Russian Federation's Global Orbiting Navigation Satellite System
(GLONASS), China Beidou Navigation Satellite System (BDS) and the European Union’s Galileo. The
major improvement in accuracy and precision is based on (1) multiband signal transmitting, (2) carrier
phase correction, (3) Real Time Kinematic (RTK). Due to the size and high-cost of today’s survey-grade
antenna solutions, this kind of technology is difficult to use widely in the automotive sector. In this paper, a
low-cost small size dual-band ceramic GNSS patch antenna is presented from design to real sample. A
further study of this patch antenna illustrates the absolute phase center variation measured in an indoor
range to achieve a received signal phase error correction. In addition, this low-cost antenna solution is
investigated when integrated into a standard multi-band automotive antenna product. This product is
evaluated both on its own in an indoor range and on a typical vehicle roof at an outdoor range. By using
this evaluation file to estimate the receiver position could achieve phase motion error-free result.
GPS uses Doppler shift from satellite radio signals to determine position. The first operational satellite navigation system was TRANSIT/NAVSAT in the 1960s, with 0.1 nautical mile accuracy. GPS later provided greater accuracy using pseudoranges from 4 satellites and correcting for ionospheric delay and receiver clock bias. Differential GPS further improves accuracy to 1m or better by transmitting corrections from a reference station. Selective availability was discontinued in 2000, improving civilian GPS accuracy from around 100m to the current sub-meter level.
The GPS system uses 24 satellites that continuously transmit radio signals. A GPS receiver uses these signals to calculate its position by precisely measuring travel times and triangulating its location based on distances to 4 or more satellites. The receiver must compensate for clock errors to get an accurate fix. The system consists of 3 segments - space, control, and user. The space segment contains the satellites, the control segment maintains satellite orbits and timing, and the user segment includes various receivers for different applications.
Application of differential systems in global navigation satellite systemsAli N.Khojasteh
Global Navigation Satellite Systems (GNSS) include different parts such as control and monitoring stations for the Earth and space settings. Timing, positioning, and control of navigation methods are the main outputs of GNSS. Based on Approach Procedure with Vertical guidance (APV), local and global Satellite Navigation Systems used for positioning and precision approach in aviation instead of present systems like Instrumental Landing Systems (ILS) and its future predict of ICAO. But these systems have errors in positioning and
velocity measurements. The differential corrections are determined by single or multiple reference stations. The single reference station concept is simple but the position accuracy is decreases. This article compares differential systems methods for correcting the errors.
Modern surveying methods and instrumentsATHIRA B K
EDM uses modulated microwave or infrared signals to measure distance. The distance is determined by emitting multiple frequencies and calculating the number of wavelengths to the target. Total stations integrate EDM, digital data storage, and angle measurement to provide position coordinates of points. GPS uses satellite triangulation to determine 3D position within meters by measuring signals from four satellites. It has made surveying faster and more efficient but relies on clear satellite signals.
This document discusses modern survey techniques, including electronic distance measurement (EDM), total stations, and global positioning systems (GPS). It provides details on:
- The three methods of EDM - microwave, infrared, and light wave instruments.
- The components, operation, and applications of total stations, including advantages over conventional surveying.
- Sources of error in EDM and total station surveys.
- How GPS uses satellites to determine receiver location and its use in surveying applications.
This document summarizes the key components and working of the Global Positioning System (GPS). It discusses the three main segments of GPS - the space segment consisting of 24 satellites, the control segment which monitors the satellites, and the user segment of GPS receivers. It describes how GPS receivers use triangulation of radio signals from four satellites to determine the receiver's precise location, velocity, and time. The document also discusses some challenges with GPS signals and provides an example of how a GPS receiver could be used to navigate and find locations within a city by comparing real-time positional data to coordinates stored in a "location master" database.
Location in ubiquitous computing, LOCATION SYSTEMSSalah Amean
The document discusses several indoor location tracking systems, including Active Badge, Active Bat, and Cricket. Active Badge uses infrared signals from badges worn by users to triangulate their location within a building using sensors. Active Bat employs ultrasonic signals and time-of-flight calculations to determine a tag's 3D location. Cricket is an ultrasound and radio frequency system that can locate a listener node within a few feet of resolution through messages from fixed beacon nodes. The document provides details on the techniques, capabilities, and example uses of these seminal indoor localization systems.
The document discusses the global positioning system (GPS) and how it has changed navigation worldwide. It provides details on the three segments of GPS - the space segment consisting of 24 satellites in orbit, the control segment of 5 ground stations that monitor the satellites, and the user segment of GPS receivers. GPS uses trilateration of radio signals from satellites to determine precise location and timing information for users. Its widespread applications now include navigation, tracking, mapping, and more.
Latest Advances in GPS technology Seminar reportMode Gautam Raj
The document summarizes the latest advances in GPS technology. It provides an overview of how GPS works with 24 satellites that orbit Earth and transmit radio signals. A GPS receiver can locate 4 or more satellites to calculate the user's position via trilateration. The document then describes the 3 segments of GPS - the space segment consisting of satellites, the control segment that tracks satellites, and the user segment of receivers. It outlines objectives of GPS for military like navigation and targeting, and for other uses such as automotive navigation, aviation, agriculture, and disaster relief.
Differential GPS (DGPS) improves the accuracy of standard GPS by using a stationary reference unit to calculate errors in the GPS signal caused by things like atmospheric conditions. This error data is transmitted to a mobile GPS unit in real-time to correct its position reading. DGPS can achieve sub-meter level accuracy compared to the 15 meter accuracy of standard GPS. It works by having a base station calculate positioning errors compared to its known location and sending corrections to a roving unit. This allows the roving unit to correct its reported position and improve accuracy.
The Global Positioning System (GPS) consists of three segments - the control segment, space segment, and user segment. The control segment monitors the satellites and ground stations. The space segment is made up of 24 satellites that orbit the Earth. The user segment includes all GPS receivers on Earth. GPS uses trilateration to determine the precise position of receivers by calculating distances to multiple satellites. Sources of error include clock errors, atmospheric delays, and multipath interference. Error correction techniques like differential GPS improve accuracy. GPS has many applications including navigation, mapping, and timing systems. Its accuracy and uses are continuing to improve in the future.
Similar to Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using Single and Dual Frequency GPS Receivers. (20)
A Study on Translucent Concrete Product and Its Properties by Using Optical F...IJMER
- Translucent concrete is a concrete based material with light-transferring properties,
obtained due to embedded light optical elements like Optical fibers used in concrete. Light is conducted
through the concrete from one end to the other. This results into a certain light pattern on the other
surface, depending on the fiber structure. Optical fibers transmit light so effectively that there is
virtually no loss of light conducted through the fibers. This paper deals with the modeling of such
translucent or transparent concrete blocks and panel and their usage and also the advantages it brings
in the field. The main purpose is to use sunlight as a light source to reduce the power consumption of
illumination and to use the optical fiber to sense the stress of structures and also use this concrete as an
architectural purpose of the building
Developing Cost Effective Automation for Cotton Seed DelintingIJMER
A low cost automation system for removal of lint from cottonseed is to be designed and
developed. The setup consists of stainless steel drum with stirrer in which cottonseeds having lint is mixed
with concentrated sulphuric acid. So lint will get burn. This lint free cottonseed treated with lime water to
neutralize acidic nature. After water washing this cottonseeds are used for agriculter purpose
Study & Testing Of Bio-Composite Material Based On Munja FibreIJMER
The incorporation of natural fibres such as munja fiber composites has gained
increasing applications both in many areas of Engineering and Technology. The aim of this study is to
evaluate mechanical properties such as flexural and tensile properties of reinforced epoxy composites.
This is mainly due to their applicable benefits as they are light weight and offer low cost compared to
synthetic fibre composites. Munja fibres recently have been a substitute material in many weight-critical
applications in areas such as aerospace, automotive and other high demanding industrial sectors. In
this study, natural munja fibre composites and munja/fibreglass hybrid composites were fabricated by a
combination of hand lay-up and cold-press methods. A new variety in munja fibre is the present work
the main aim of the work is to extract the neat fibre and is characterized for its flexural characteristics.
The composites are fabricated by reinforcing untreated and treated fibre and are tested for their
mechanical, properties strictly as per ASTM procedures.
Hybrid Engine (Stirling Engine + IC Engine + Electric Motor)IJMER
Hybrid engine is a combination of Stirling engine, IC engine and Electric motor. All these 3 are
connected together to a single shaft. The power source of the Stirling engine will be a Solar Panel. The aim of
this is to run the automobile using a Hybrid engine
Fabrication & Characterization of Bio Composite Materials Based On Sunnhemp F...IJMER
This document summarizes research on the fabrication and characterization of bio-composite materials using sunnhemp fibre. The document discusses how sunnhemp fibre was used to reinforce an epoxy matrix through hand lay-up methods. Various mechanical properties of the bio-composites were tested, including tensile, flexural, and impact properties. The results of the mechanical tests on the bio-composite specimens are presented. Potential applications of the sunnhemp fibre bio-composites are also suggested, such as in fall ceilings, partitions, packaging, automotive interiors, and toys.
Geochemistry and Genesis of Kammatturu Iron Ores of Devagiri Formation, Sandu...IJMER
The Greenstone belts of Karnataka are enriched in BIFs in Dharwar craton, where Iron
formations are confined to the basin shelf, clearly separated from the deeper-water iron formation that
accumulated at the basin margin and flanking the marine basin. Geochemical data procured in terms of
major, trace and REE are plotted in various diagrams to interpret the genesis of BIFs. Al2O3, Fe2O3 (T),
TiO2, CaO, and SiO2 abundances and ratios show a wide variation. Ni, Co, Zr, Sc, V, Rb, Sr, U, Th,
ΣREE, La, Ce and Eu anomalies and their binary relationships indicate that wherever the terrigenous
component has increased, the concentration of elements of felsic such as Zr and Hf has gone up. Elevated
concentrations of Ni, Co and Sc are contributed by chlorite and other components characteristic of basic
volcanic debris. The data suggest that these formations were generated by chemical and clastic
sedimentary processes on a shallow shelf. During transgression, chemical precipitation took place at the
sediment-water interface, whereas at the time of regression. Iron ore formed with sedimentary structures
and textures in Kammatturu area, in a setting where the water column was oxygenated.
Experimental Investigation on Characteristic Study of the Carbon Steel C45 in...IJMER
In this paper, the mechanical characteristics of C45 medium carbon steel are investigated
under various working conditions. The main characteristic to be studied on this paper is impact toughness
of the material with different configurations and the experiment were carried out on charpy impact testing
equipment. This study reveals the ability of the material to absorb energy up to failure for various
specimen configurations under different heat treated conditions and the corresponding results were
compared with the analysis outcome
Non linear analysis of Robot Gun Support Structure using Equivalent Dynamic A...IJMER
Robot guns are being increasingly employed in automotive manufacturing to replace
risky jobs and also to increase productivity. Using a single robot for a single operation proves to be
expensive. Hence for cost optimization, multiple guns are mounted on a single robot and multiple
operations are performed. Robot Gun structure is an efficient way in which multiple welds can be done
simultaneously. However mounting several weld guns on a single structure induces a variety of
dynamic loads, especially during movement of the robot arm as it maneuvers to reach the weld
locations. The primary idea employed in this paper, is to model those dynamic loads as equivalent G
force loads in FEA. This approach will be on the conservative side, and will be saving time and
subsequently cost efficient. The approach of the paper is towards creating a standard operating
procedure when it comes to analysis of such structures, with emphasis on deploying various technical
aspects of FEA such as Non Linear Geometry, Multipoint Constraint Contact Algorithm, Multizone
meshing .
Static Analysis of Go-Kart Chassis by Analytical and Solid Works SimulationIJMER
This paper aims to do modelling, simulation and performing the static analysis of a go
kart chassis consisting of Circular beams. Modelling, simulations and analysis are performed using 3-D
modelling software i.e. Solid Works and ANSYS according to the rulebook provided by Indian Society of
New Era Engineers (ISNEE) for National Go Kart Championship (NGKC-14).The maximum deflection is
determined by performing static analysis. Computed results are then compared to analytical calculation,
where it is found that the location of maximum deflection agrees well with theoretical approximation but
varies on magnitude aspect.
In récent year various vehicle introduced in market but due to limitation in
carbon émission and BS Séries limitd speed availability vehicle in the market and causing of
environnent pollution over few year There is need to decrease dependancy on fuel vehicle.
bicycle is to be modified for optional in the future To implement new technique using change in
pedal assembly and variable speed gearbox such as planetary gear optimise speed of vehicle
with variable speed ratio.To increase the efficiency of bicycle for confortable drive and to
reduce torque appli éd on bicycle. we introduced epicyclic gear box in which transmission done
throgh Chain Drive (i.e. Sprocket )to rear wheel with help of Epicyclical gear Box to give
number of différent Speed during driving.To reduce torque requirent in the cycle with change in
the pedal mechanism
Integration of Struts & Spring & Hibernate for Enterprise ApplicationsIJMER
This document discusses integrating the Spring, Struts, and Hibernate frameworks to develop enterprise applications. It provides an overview of each framework and their features. The Spring Framework is a lightweight, modular framework that allows for inversion of control and aspect-oriented programming. It can be used to develop any or all tiers of an application. The document proposes an architecture for an e-commerce website that integrates these three frameworks, with Spring handling the business layer, Struts the presentation layer, and Hibernate the data access layer. This modular approach allows for clear separation of concerns and reduces complexity in application development.
Microcontroller Based Automatic Sprinkler Irrigation SystemIJMER
Microcontroller based Automatic Sprinkler System is a new concept of using
intelligence power of embedded technology in the sprinkler irrigation work. Designed system replaces
the conventional manual work involved in sprinkler irrigation to automatic process. Using this system a
farmer is protected against adverse inhuman weather conditions, tedious work of changing over of
sprinkler water pipe lines & risk of accident due to high pressure in the water pipe line. Overall
sprinkler irrigation work is transformed in to a comfortableautomatic work. This system provides
flexibility & accuracy in respect of time set for the operation of a sprinkler water pipe lines. In present
work the author has designed and developed an automatic sprinkler irrigation system which is
controlled and monitored by a microcontroller interfaced with solenoid valves.
Intrusion Detection and Forensics based on decision tree and Association rule...IJMER
This paper present an approach based on the combination of, two techniques using
decision tree and Association rule mining for Probe attack detection. This approach proves to be
better than the traditional approach of generating rules for fuzzy expert system by clustering methods.
Association rule mining for selecting the best attributes together and decision tree for identifying the
best parameters together to create the rules for fuzzy expert system. After that rules for fuzzy expert
system are generated using association rule mining and decision trees. Decision trees is generated for
dataset and to find the basic parameters for creating the membership functions of fuzzy inference
system. Membership functions are generated for the probe attack. Based on these rules we have
created the fuzzy inference system that is used as an input to neuro-fuzzy system. Fuzzy inference
system is loaded to neuro-fuzzy toolbox as an input and the final ANFIS structure is generated for
outcome of neuro-fuzzy approach. The experiments and evaluations of the proposed method were
done with NSL-KDD intrusion detection dataset. As the experimental results, the proposed approach
based on the combination of, two techniques using decision tree and Association rule mining
efficiently detected probe attacks. Experimental results shows better results for detecting intrusions as
compared to others existing methods
Natural Language Ambiguity and its Effect on Machine LearningIJMER
This document discusses natural language ambiguity and its effect on machine learning. It begins by introducing different types of ambiguity that exist in natural languages, including lexical, syntactic, semantic, discourse, and pragmatic ambiguities. It then examines how these ambiguities present challenges for computational linguistics and machine translation systems. Specifically, it notes that ambiguity is a major problem for computers in processing human language as they lack the world knowledge and context that humans use to resolve ambiguities. The document concludes by outlining the typical process of machine translation and how ambiguities can interfere with tasks like analysis, transfer, and generation of text in the target language.
Today in era of software industry there is no perfect software framework available for
analysis and software development. Currently there are enormous number of software development
process exists which can be implemented to stabilize the process of developing a software system. But no
perfect system is recognized till yet which can help software developers for opting of best software
development process. This paper present the framework of skillful system combined with Likert scale. With
the help of Likert scale we define a rule based model and delegate some mass score to every process and
develop one tool name as MuxSet which will help the software developers to select an appropriate
development process that may enhance the probability of system success.
Material Parameter and Effect of Thermal Load on Functionally Graded CylindersIJMER
The present study investigates the creep in a thick-walled composite cylinders made
up of aluminum/aluminum alloy matrix and reinforced with silicon carbide particles. The distribution
of SiCp is assumed to be either uniform or decreasing linearly from the inner to the outer radius of
the cylinder. The creep behavior of the cylinder has been described by threshold stress based creep
law with a stress exponent of 5. The composite cylinders are subjected to internal pressure which is
applied gradually and steady state condition of stress is assumed. The creep parameters required to
be used in creep law, are extracted by conducting regression analysis on the available experimental
results. The mathematical models have been developed to describe steady state creep in the composite
cylinder by using von-Mises criterion. Regression analysis is used to obtain the creep parameters
required in the study. The basic equilibrium equation of the cylinder and other constitutive equations
have been solved to obtain creep stresses in the cylinder. The effect of varying particle size, particle
content and temperature on the stresses in the composite cylinder has been analyzed. The study
revealed that the stress distributions in the cylinder do not vary significantly for various combinations
of particle size, particle content and operating temperature except for slight variation observed for
varying particle content. Functionally Graded Materials (FGMs) emerged and led to the development
of superior heat resistant materials.
Energy Audit is the systematic process for finding out the energy conservation
opportunities in industrial processes. The project carried out studies on various energy conservation
measures application in areas like lighting, motors, compressors, transformer, ventilation system etc.
In this investigation, studied the technical aspects of the various measures along with its cost benefit
analysis.
Investigation found that major areas of energy conservation are-
1. Energy efficient lighting schemes.
2. Use of electronic ballast instead of copper ballast.
3. Use of wind ventilators for ventilation.
4. Use of VFD for compressor.
5. Transparent roofing sheets to reduce energy consumption.
So Energy Audit is the only perfect & analyzed way of meeting the Industrial Energy Conservation.
An Implementation of I2C Slave Interface using Verilog HDLIJMER
This document describes the implementation of an I2C slave interface using Verilog HDL. It introduces the I2C protocol which uses only two bidirectional lines (SDA and SCL) for communication. The document discusses the I2C protocol specifications including start/stop conditions, addressing, read/write operations, and acknowledgements. It then provides details on designing an I2C slave module in Verilog that responds to commands from an I2C master and allows synchronization through clock stretching. The module is simulated in ModelSim and synthesized in Xilinx. Simulation waveforms demonstrate successful read and write operations to the slave device.
Discrete Model of Two Predators competing for One PreyIJMER
This paper investigates the dynamical behavior of a discrete model of one prey two
predator systems. The equilibrium points and their stability are analyzed. Time series plots are obtained
for different sets of parameter values. Also bifurcation diagrams are plotted to show dynamical behavior
of the system in selected range of growth parameter
Application of Parabolic Trough Collectorfor Reduction of Pressure Drop in Oi...IJMER
Pipelines are the least expensive and most effective method for the oil transportation.
Due to high viscosity of crude oil, the pressure drop and pumping power requirements are very high.
So it is necessary to bring down the viscosity of crude oil. Heated pipelines are used reduce the oil
viscosity by increasing the oil temperature. Electrical heating and direct flame heating are the common
method used for heating the oil pipeline. In this work, a new application of Parabolic Trough Collector
in the field of oil pipeline transport is introduced for reducing pressure drop in oil pipelines. Oil
pipeline is heated by applying concentrated solar radiation on the pipe surface using a Parabolic
Trough Collector in which the oil pipeline acts as the absorber pipe. 3-D steady state analysis is
carried out on a heated oil pipeline using commercial CFD software package ANSYS Fluent 14.5. In
this work an effort is made to investigate the effect of concentrated solar radiation for reducing
pressure drop in the oil pipeline. The results from the numerical analysis shows that the pressure drop
in oil pipeline is get reduced by heating the pipe line using concentrated solar radiation. From this
work, the application of PTC in oil pipeline transportation is justified.
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
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JavaLand 2024: Application Development Green Masterplan
Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using Single and Dual Frequency GPS Receivers.
1. International
OPEN
Journal
ACCESS
Of Modern Engineering Research (IJMER)
Assessment of the Accuracy of Processing GPS Static Baselines
Up To 40 Km Using Single and Dual Frequency GPS Receivers.
Khaled Mohamed Abdel Mageed
Assoc. Prof., Dept. of Civil Eng., Higher Technological Institute, Egypt
ABSTRACT: GPS applications can be grouped into static applications and kinematic applications.
Static applications of GPS can be used in geodetic surveying, Arial photogrammetric surveying, land
surveying, orthometric height determination, topographic mapping, monitoring structural
deformations, and engineering surveys; while kinematic applications of GPS, can be used in attitude
determination of a moving body. On the other hand, GPS receivers can be categorized into two types:
single frequency receivers which access the L1 frequency only, while dual frequency receivers which
access both L1 and L2 frequencies. Single frequency receivers are affected more by ionospheric
errors than dual frequency receivers, but they are less expensive, making them adaptable for certain
surveying applications.
This paper investigates the accuracy of the discrepancies in Cartesian coordinates X, Y, and
Z and the horizontal and spatial position P, in case of using single frequency and dual frequency GPS
receivers for solving GPS baselines up to 40 km by static GPS technique. The results supported with
statistical analysis showed that the horizontal positional discrepancy P2d between the single and
dual frequency data has a mean value of 11.5mm with 3.5mm standard deviation, while the spatial
positional discrepancy P3d has a mean value of 14.2mm with standard deviation 4.2mm. These
findings are satisfying the standard and specification of establishing the first-order geodetic
networks, as per the Federal Geodetic Control Committee FGCC. This means that the GPS single
frequency receivers, which are less expensive than the dual frequency receivers, can be used in
establishing GPS first-order control networks, up to 40 km baseline’s lengths.
Keywords: GPS; Single frequency data; Dual frequency data.
I.
INTRODUCTION
GPS has several applications in the field of geodesy, surveying, and mapping. GPS can be considered
as one of the most distinct positioning systems for modern geodetic applications. Its benefits can be clearly
shown in its practical applications as applied in surveying tasks. Generally, GPS applications can be grouped
into static applications and kinematic applications. Static applications are concerned with positioning of
stationary points, while kinematic applications are concerned with the positioning of moving objects. Static
applications of GPS can be used in geodetic surveying, Arial photogrammetric surveying, land surveying,
orthometric height determination, topographic mapping, monitoring structural deformations, and engineering
surveys. On the other hand, kinematic applications of GPS, can be used in attitude determination of a moving
body, where the attitude is defined as the orientation of a specific coordinate system in a land vehicle, a ship, or
an aircraft, with respect to a global or local coordinate system [1].
GPS measurements are subjected to some errors, which are affecting the accuracy of the final results.
There are two basic types of errors, which are the systematic errors or biases, and the random errors. Generally,
the biases affecting the GPS measurements fall into three categories, which are: satellite biases, station biases,
and signal propagation biases. Satellite biases consist of biases in satellite ephemeris and satellite clock. Ground
station biases usually consist of receiver clock bias, receiver noise and antenna phase center variation. The
signal propagation biases appear due to tropospheric refraction, ionospheric refraction, and multipath. Biases in
GPS are greatly eliminated either by modeling or by using special observing techniques, based on the concept of
differenced modes. In addition to the mentioned three groups of GPS biases, the accuracy of the computed GPS
position is also affected by the geometric locations of the GPS satellites as can be detected by the receiver. The
more spread out the satellites are in the sky, the better the obtained accuracy of the GPS derived 3-d coordinates
[2].
| IJMER | ISSN: 2249–6645 |
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2. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
GPS receivers can be categorized into two types: single frequency receivers which access the L1
frequency only, while dual frequency receivers which access both L1 and L2 frequencies. The single frequency
receivers output the raw C/A code pseudoranges, the L1 carrier phase measurements, and the navigation
message, and gives accuracy about 1cm+2ppm. The dual frequency receivers is the most sophisticated and most
expensive receiver type. This type of receiver is capable of measuring all the GPS observables, which are: L1,
L2 carriers, C/A code, and P-code, and gives accuracy 5mm+1ppm [3]. Single frequency receivers are affected
more by ionospheric errors than dual frequency receivers, but they are less expensive, making them adaptable
for certain surveying applications. On the other hand, Dual frequency, multiple channel receivers can
compensate better for ionospheric errors and these receivers are ideal for geodetic applications.
This paper investigates the accuracy of the discrepancies in Cartesian coordinates X, Y, and Z and the
horizontal and spatial position P, in case of using single frequency and dual frequency GPS receivers for solving
GPS baselines up to 40 km by static GPS technique. The GPS observables including code and phase
measurements will be reviewed. The static GPS technique along with its field procedure and desired accuracy
will be introduced. The methodology of investigation and the description of the field test will be presented.
Finally, the analysis of the obtained results supported with the statistical analysis will be shown, from which the
important conclusions and recommendations will be drawn.
II.
REVIEW OF GPS OBSERVABLES
GPS observables are ranges which are deduced from measured time or phase differences based on a
comparison between received signals and generated signals. Unlike the terrestrial distance measurements, GPS
uses the so-called one-way concept, where, two clocks are used, namely one in the satellite, and the other in the
receiver. Thus, the ranges are affected by satellite and receiver clocks errors and, consequently, they are denoted
as pseudoranges. There are two types of GPS observables, namely the code pseudoranges and carrier phase
observables. In general, the pseudorange observations are used for coarse navigation, whereas the carrier phase
observations are used in high-precision surveying applications. That is due to the fact that the accuracy of the
carrier phase observations is higher than the accuracy of code observations, [4].
Beside the two GPS observables, the GPS satellite transmits a navigation message. The navigation
message is a data stream added to both L1 and L2 carriers as binary biphase modulation at a low rate of 50 Kbps. It
consists of 25 frames of 1500 bits each, or 37500 bits in total. This means that, the transmition of the complete
navigation message takes 750 seconds. The navigation message contains, along with other information, the
coordinates of the GPS satellites as a function of time, the satellite health status, the satellite clock correction, the
satellite almanac, and atmospheric data. Each satellite transmits its own navigation message with information on
the other satellites, such as the approximate location and health status [5].
2.1 Code Pseudorange Observables
The code pseudorange is a measure of the distance between the satellite and the receiver. The P-code,
C/A-code can be used to determine the code pseudorange. These ranges can be determined by multiplying the
speed of light by the time shift required to match the code generated in the receiver with the code received from
the satellite (figure 1). Analogously, the delays of the clocks with respect to GPS system time frame will lead to
timing error. The tropospheric and ionospheric delays affect the measured code pseudorange [6]. The general
form of code pseudorange observation equation is:
(1)
P = + c( dt – dT ) + dion + dtrop + dorb + p
Where: P is the observed pseudorange, is the unknown geometric satellite to receiver range, c is
speed of light which is approximately equal to 300,000 km/s, dt and dT are satellite and receiver clock errors
respectively, dion, dtrop, are the error due to ionospheric, tropospheric refraction respectively, d orb is the orbital
error and p is the code measurement noise.
Fig. 1: GPS Pseudorange Observables
| IJMER | ISSN: 2249–6645 |
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3. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
The precision of a pseudorange derived from code measurement has been about 1% of the chip length.
Consequently, a precision of about 3m, 0.3m is achieved with C/A-code and P-code pseudoranges respectively.
However, recent development indicates that a precision of about 0.1% of the chip length may be obtained [7].
Many applications are based on the pseudorange observations, mostly related to the fields of navigation,
where the instantaneous positions are required. Note in equation (1) that, the bias term d ion can be determined,
with high percentage, in case of using dual frequency receivers, since the ionospheric effect is frequency
dependant, and its estimation parameters are usually transmitted within the satellite message [8]. Concerning the
tropospheric effect term dtrop, it can be evaluated to more than 95%, using an adopted model, which is a function
of measured meteorological quantities, such as humidity, pressure, and temperature, of the atmosphere
surrounding the receiver position. Concerning the orbital bias term d orb, it can be estimated from satellite orbital
dynamics continuous analysis, at the master control station, and included in the satellite-transmitted message
also. The satellite and receiver clocks biases term (dt-dT), is usually treated as one unknown parameter. Hence,
equation (1) of observed pseudorange will be left out with only four unknowns parameters, which are the 3-d
geocentric cartesian coordinates (X, Y, Z) of the receiver antenna position, in addition to the clock bias term. Of
course, in order to solve such an equation, for the four unknown parameters, one needs to have four of these
observation equations. This is why the GPS system is designed, such that at least four GPS satellites can be
observed simultaneously at the same time from the ground receiver. However, for more reliability of the derived
receiver 3-d coordinates, collected observations from several satellites, over a certain period called session, must
be performed, in order to apply the least squares estimation process, with a high degree of freedom [9].
2.2 Carrier Phase Observables
The range between the receiver and satellite can be obtained through the carrier phase. The range
would simply be the sum of the total number of full carrier cycles plus fractional cycle at the receiver and the
satellite, multiplied by the carrier wave length (figure 2). The ranges determined with the carriers are more
accurate than those obtained by the codes [10]. This is due to the fact that, the wavelength of the carrier signal
(19cm in case of L1) is smaller than the codes. However, there is a problem that the carriers are just pure
sinusoidal waves, which means that all cycles look the same. Therefore, the GPS receiver has no means to
differentiate one cycle from the other. In other words, the receiver cannot determine the total number of the
complete cycles between the satellite and receiver when switched on. The receiver can only measure a fraction
of a cycle accurately, while the initial number of complete cycles remains unknown, or ambiguous [11]. This
initial cycle ambiguity remains unchanged over time as long as no signal loss or cycle slip occurs.
Fig. 2: GPS Carrier Phase Observables
The observation equation of the phase pseudorange is:
(2)
= + c(dt – dT) + N – dion + dtrop + dorb +
Where, the measured phase is indicated in meters by , is the carrier wavelength, N is the phase ambiguity,
and is the combined receiver and multipath noise, and the other remaining symbols are the same as defined
| IJMER | ISSN: 2249–6645 |
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4. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
in equation (2). The same analysis of the bias terms and unknown parameters, as given in the previous
subsection, holds true here also for the case of carrier phase observation equation. The only difference here is
the ambiguity term N, which can be solved for, using a certain adopted technique, which will be discussed later.
This means, again, that at least four satellites should be in view at the time, which can be simultaneously tracked
from the same ground receiver. On the other hand, for both cases of code pseudorange and carrier phase
pseudorange, most of the bias terms can be eliminated, or minimized by following a certain technique for
collecting GPS measurements, such as single, double, and triple differences; and/or using mathematical model;
and/or using linear combination [12].
Accuracy of the carrier phase measurements can reach the centimetre level or even less. Accordingly,
all GPS precise geodetic applications are mainly based on this type of observables. Such applications include
monitoring of local and regional crustal deformations, and the establishment of geodetic control networks. Both
types of GPS observables are different in their nature. The pseudorange is an instantaneous observation, which is in
principle independent of post measurements, whereas the carrier phase measurement is continuous and dependent
on the tracking history. In fact, the two types of GPS observables can be combined in the so-called phase-smoothed
pseudorange, [13]. In this concept, the change of phase over time is added to the initial pseudorange to get an
estimate of the current pseudorange observation. The noise of the resulting new observable will be lower than the
noise of the original pseudorange. In addition, this approach has the advantage of the significant reduction of
multipath effect, which affects the carrier phase observations much less than the pseudoranges.
III.
GPS STATIC TECHNIQUE
The selection of the observation technique in a GPS survey depends upon the particular requirements
of the project, and the desired accuracy especially is playing a dominant role. The GPS observation techniques
include: single point positioning SPP; differential positioning DGPS; and relative positioning. Relative
positioning includes: static, rapid static, stop and go, kinematic, real time kinematic RTK. GPS single point
positioning employs one GPS receiver, while DGPS and relative GPS positioning employ two or more GPS
receivers, simultaneously tracking the same satellites. Surveying works with GPS have conventionally been
carried out in the relative and differential positioning techniques. This is mainly due to the higher positioning
accuracy obtained from the relative and differential techniques, compared to that of the GPS point positioning.
A major disadvantage of GPS relative and differential techniques, however, is the dependency on the
measurements or corrections from the reference receiver [14].
GPS Static relative positioning is the common method for control networks, due to its high accuracy.
Static relative positioning by carrier phase at present, is the most frequently used method by surveyors, as it is
more accurate as compared to the code pseudorange measurements. The principle of static relative positioning,
is based on determining the vector between two stationary receivers, this vector is often called baseline.
According to this terminology, the process is called single or multipoint baseline determination. In static
surveying 1 ppm to 0.1 ppm accuracies are achieved, which is equivalent to few centimetres and millimetres
accuracy, for short baselines of some kilometres [3].
The field procedure of relative static survey, is performed by placing a receiver on a known point, and
placing the second receiver on the unknown point, and collecting simultaneously data from at least four
satellites. The observing time required to fix the position, is called a session. This time is varying according to
baseline length, satellite configuration, selective availability, atmospheric conditions, and the required accuracy.
Normally, one-hour observation period is required to each baseline. However, to increase the accuracy, the
receiver may be kept observing for longer period especially, in case of long length baselines. Figure (3) shows
the basic idea of GPS static technique. Typically, the range of accuracy for static survey, is normally 0.3–1.0 cm
+ 1–2 ppm. [2].
Fig. 3: Concept of GPS Static Technique
| IJMER | ISSN: 2249–6645 |
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| Vol. 4 | Iss. 1 | Jan. 2014 |182|
5. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
After completing the field work, the collected date is downloaded from the receivers to the PC for
processing. Different processing options may be selected depending on the baseline length, and other factors.
For example, if the baseline is relatively short, say, 15-20km, resolving the ambiguity would be a key issue to
ensure high precision accuracy. On the other hand, if the baseline is relatively long, the user may select the
ionosphere free linear combination to remove the effect of the ionosphere. For very long baselines, over
1000km, it is recommended to process the data using scientific software such as BERNESE software, developed
by the University of Bern, rather than using commercial software [3]. The static surveying is usually applied in
high accuracy surveying projects, such as establishing new geodetic networks, densification of existing first
order control networks or lower order network, crustal movements, and structural deformation.
IV.
METHODOLOGY OF INVESTIGATION
The objective of this paper is to statically analyze the difference in 3-d coordinates, as well as the
horizontal and spatial positions, resulted from processing GPS baselines up to 40 km collected by static GPS
technique, using single frequency data L1, and dual frequency data L1 and L2. A number of 15 GPS static
baselines with approximate distances from 1.5 km to 42.5 km, were processed two times: the first one using
single frequency L1 data, and the second one using the dual frequency data L1 and L2.
The field test was conducted at Taif city, Saudi Arabia on April 2012. A dual frequency GPS receiver
of Topcon GR3 was setup at a reference control point [15]. A second dual frequency receiver of the same type
of Topcon GR3 was set up sequentially on 15 new control points of approximate distances from 1.5 km to 42.5
km, from the base station. The observational operating parameters were the same for the two receivers, which
are: static mode, elevation angle 150, and 10 seconds rate of observations. The observational durations of the
baselines were as shown in table 1.
Table 1: duration of GPS static observation data
Baselines Range (km)
Duration (minutes)
1 to 5
30
5 to 10
45
10 to 15
60
15 to 20
90
20 to 25
120
25 to 30
150
30 to 35
180
35 to 42
210
The raw data of the GPS campaign were downloaded and transferred to Rinex format using Topcon
Link software [16]. The processing of the Rinex data was conducted using Leica Geo Office software [17] . The
data were processed two times: the first run was using L1 data, while the second run was using L1 and L2 data.
The 3-d cartesian coordinates for every baseline in each run were archived for the statistical analysis.
V.
ANALYSIS OF RESULTS
The analysis of the results will be based on comparing the discrepancies in X, Y, and Z coordinates
between processing 15 GPS baselines using dual frequency data L1 and L2, against processing the same
baselines with single frequency data L1 only. The cartesian discrepancies are:
∆𝑋 𝑑𝑢𝑙 −𝑠𝑖𝑛 = 𝑋 𝑑𝑢𝑙 − 𝑋 𝑠𝑖𝑛
∆𝑌 𝑑𝑢𝑙 −𝑠𝑖𝑛 = 𝑌 𝑑𝑢𝑙 − 𝑌𝑠𝑖𝑛
(3)
∆𝑍 𝑑𝑢𝑙 −𝑠𝑖𝑛 = 𝑍 𝑑𝑢𝑙 − 𝑍 𝑠𝑖𝑛
Where: ΔXdul-sin , ΔYdul-sin , and ΔZdul-sin : the X, Y, and Z discrepancies between using dual and single
frequency data.
Xdul , Ydul , and Zdul : the X, Y, and Z coordinates resulted from using dual frequency data L1 and L2.
Xsin, Ysin , and Zsin : the X, Y, and Z coordinates resulted from using single frequency data L1.
The 2-d and 3-d positional discrepancy between the two solutions ∆P2d , ∆P3d , as well as the standard
deviation
p
2d
, p3 d can be calculated from [18]:
P2 d (X dulsin ) 2 (Ydulsin ) 2
2
2
p X
2d
dulsin
2
Ydulsin
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(4)
P3d (X dulsin ) 2 (Ydulsin ) 2 (Z dulsin ) 2
2
2
p X
3d
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dulsin
2
2
Ydulsin Z dulsin
(5)
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6. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
The discrepancies in X, Y, Z and 2-d and 3-d position P, between processing the GPS data using dual and single
frequency data are shown in Table (2).
Baseli
ne
Id
Table 2: The discrepancies in X, Y, Z, and position P
Baseline
ΔX
ΔY
ΔZ (mm) ΔP2d (mm)
ΔP3d (mm)
Length
(mm) (mm)
(km)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1.6
3.0
4.8
7.3
9.4
11.0
13.7
15.4
18.7
22.2
25.7
28.2
33.4
37.3
42.5
-0.9
4.5
3.8
-0.5
4.0
10.3
16.0
-12.1
16.2
-5.2
-15.6
-10.0
15.3
6.3
2.0
1.4
8.2
0.8
-3.3
-1.2
3.6
15.3
-6.4
-13.8
1.0
4.7
-14.5
-0.4
-19.2
-7.1
0.8
5.8
-15.9
-5.0
-4.8
-4.5
12.6
-2.1
11.9
1.4
1.2
-14.0
-17.6
-7.2
-1.1
1.7
9.4
3.9
3.3
4.2
10.9
22.1
13.7
21.3
5.3
16.3
17.6
15.3
20.2
7.4
1.8
11.0
16.4
6.0
6.4
11.8
25.5
13.8
24.4
5.5
16.3
22.5
23.3
21.5
7.5
Figures (4) shows the X, Y, and Z coordinate discrepancies for the 15 baselines derived from dual and single
frequency data. In addition, Figure (5) shows the 2-d and 3-d positional discrepancies P for the same baselines.
30
25
20
15
Discrepancy (mm)
10
5
0
dX
-5
dY
-10
-15
dZ
-20
42.5
37.3
33.4
28.2
25.7
22.2
18.7
15.4
13.7
11.0
9.4
7.3
4.8
3.0
1.6
-25
-30
Approx. Baseline Length (km)
Figure 4: Variation of the X, Y, and Z coordinate discrepancies
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7. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
40
dP (2d)
35
dP (3d)
30
Discrepancy
25
20
15
10
5
42.5
37.3
33.4
28.2
25.7
22.2
18.7
15.4
13.7
11.0
9.4
7.3
4.8
3.0
1.6
0
Approx. Baseline Length (km)
Figure 5: Variation of the Positional discrepancies
The previous figures are supported by descriptive statistics to measure the quality of the obtained
results. Table (3) shows these descriptive statistics. For instance, the X-coordinate discrepancies have mean
value 2.3mm and SD 10mm for single determination. The Y-coordinate discrepancies have mean value of 2.1mm and 9.1mm SD for single determination. The Z-coordinate discrepancies have -2.6mm mean value and
9mm SD for single determination. Finally, the 2-d and 3-d positional discrepancies have 11.5mm, 14.2mm
mean value respectively; with SD 13.5mm, and 16.2mm respectively.
Table 3: Descriptive statistics of the discrepancies (mm)
Disc.
Max.
Min. Range
Mean
S.Dsingle S.Dmean
ΔX
ΔY
ΔZ
-15.6
-19.2
-17.6
1.7
31.8
34.5
30.2
20.5
2.3
-2.1
-2.6
11.5
10.0
9.1
9.0
13.5
2.6
2.3
2.3
3.5
25.5
ΔP2d
ΔP3d
16.2
15.3
12.6
22.1
1.8
23.6
14.2
16.2
4.2
In order to check any systematic errors in the sample of the resulted discrepancies, the sample mean
should be examined according to its deviation from the mean of the population which equal to zero [18]. This
random sample is assumed to be normaly distributed and had taken from a population of unknown true mean μ
equal to zero. The following confidence interval can be used:
𝜇 − 𝑇 (6) 𝑚𝑒𝑎𝑛 < 𝑚 < 𝜇 + 𝑇 . 𝑆
. 𝑆𝐷
Where μ is the population mean (μ =0), 𝑆𝐷 𝑚𝑒𝑎𝑛 is the sample standard deviation, T is the Student tdistribution corresponding to sample size n and degree of freedom df equal to n-1, assuming that the confidence
level is 95%. Table 4 shows the results of this test which indicates that no significant systematic errors are
existing in the discrepancies between the two solutions.
Disc.
Df
ΔX
ΔY
ΔZ
14
Table 4: Testing of deviation of the sample mean
SDmean
Lower limit
Mean
Upper limit
2.6 mm
-5.6 mm
2.3 mm
5.6 mm
2.14 2.3 mm
-4.9 mm
-2.1 mm
4.9 mm
2.3 mm
-4.9 mm
-2.6 mm
4.9 mm
T
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Test result
pass
pass
pass
| Vol. 4 | Iss. 1 | Jan. 2014 |185|
8. Assessment of the Accuracy of Processing GPS Static Baselines Up To 40 Km Using…
VI.
CONCLUSIONS
This paper analyzes the difference in Cartesian coordinates X, Y, and Z between processing GPS
baselines which are collected with static technique, in case of using single frequency data L1, and in case of
using dual frequency data L1 and L2. A field test consists of 15 GPS static baselines, was made for the purpose
of the analysis. The baseline lengths were ranged from 1.5 km to 42.5 km.
The results supported with statistical analysis showed that the differences in the cartesian coordinates
between processing GPS static baselines using single and dual frequency data have mean values of 2.3mm,
2.1mm, and 2.6mm in X, Y, and Z coordinates respectively. The standard deviations of these means are: 2.6mm,
2.3mm, and 2.3mm for the 3-d cartesian components respectively. The horizontal positional discrepancy P 2d
between the single and dual frequency data has a mean value of 11.5mm with 3.5mm standard deviation, while
the spatial positional discrepancy P3d has a mean value of 14.2mm with standard deviation 4.2mm. The relative
accuracy of the horizontal positioning using GPS single frequency data is about 1:370,000, which satisfying the
standard and specification of establishing the first-order geodetic networks which is 1:120,000, as per the
Federal Geodetic Control Committee FGCC.
The previous results showed that there are no significant differences in the resulted cartesian
coordinates in case of processing GPS baselines collected with static technique, using single frequency data L1,
or using dual frequency data L1 and L2. This means that the GPS single frequency receivers, which are less
expensive than the dual frequency receivers, can be used in establishing GPS first-order control networks, up to
40 km baseline’s lengths.
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