The document discusses the Global Positioning System (GPS), including its architecture, how it works, sources of errors, and applications. GPS is a satellite-based navigation system consisting of 24 satellites operated by the U.S. Department of Defense. It allows devices to determine their precise location by calculating the distance from at least four satellites. While originally intended for military use, GPS is now widely used for civilian and commercial applications such as navigation systems, mapping, and precision agriculture.
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Global positioning system and its mathematical form.
By Mustahsan Khan _ BS(physics-Nanotechnology) (International Islamic University Islamabad) Pakistan.
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Global positioning system and its mathematical form.
By Mustahsan Khan _ BS(physics-Nanotechnology) (International Islamic University Islamabad) Pakistan.
A geographic information system (GIS) is a collection of hardware,
software, geographicdata, and personnel designed to create, store, edit,
manipulate, analyze and display geographically referenced information.
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In ArcGIS, a data model describes the thematic layers used in the applications (for example, hamburger stands, roads, and counties); their spatial representation (for example, point, line, or polygon); their attributes; their integrity rules and relationships (for example, counties must nest within states).
Basic Concepts, Explanation, and Application. Fundamental Remote Sensing; Advantage/ disadvantages, Imaging/non Imaging sensors, RAR and SAR, SAR Geometry, Resolutions in the microwave, Geometric Distortions in SAR, Polarization in SAR, Target Interaction, SAR Interferometry
Global Positioning System (GPS) is the only system today able to show one’s own position on the earth any time in any weather, anywhere. This paper addresses this satellite based navigation system at length. The different segments of GPS viz. space segment, control segment, user segment are discussed. In addition, how this amazing system GPS works, is clearly described. The various errors that degrade the performance of GPS are also included. DIFFERENTIAL GPS, which is used to improve the accuracy of measurements, is also studied. The need, working and implementation of DGPS are discussed at length. Finally, the paper ends with advanced application of GPS.
GPS helps us identify exact location of a place/feature in the globe. Now-a-days we can carry out survey, enter data and process data. GPS is very helpful in soil survey
Global Positioning System (GPS) is a satellite based navigation system that can provide people who use it with their exact position on Earth, tell them how to get to another location, how fast they are moving, where they have been, how far they have gone, what time it is. GPS was originally designed to help the U.S. military with finding the accurate location of their soldiers, vehicles, planes and ships around the world. Now, GPS is used in cellular phones, navigation and map making.
Space segmentsGPS satellites fly in medium Earth orbit (MEO) at an altitude of approximately 20,200 km (12,550 miles). Each satellite circles the Earth twice a day.The satellites in the GPS constellation are arranged into six equally-spaced orbital planes surrounding the Earth. Each plane contains four "slots" occupied by baseline satellites. This 24-slot arrangement ensures users can view at least four satellites from virtually any point on the planet.
The control segment
The control segment of the GPS system consists of a worldwide network of tracking stations.
The master control station (MCS) located in the United States at Colorado Springs, Colorado.
The primary task of the operational control segment is tracking the GPS satellites in order to determine and predict satellite locations, system integrity, behavior of the satellite atomic clocks, atmospheric data, the satellite almanac, and other considerations.
The User segment
The user segment includes all military and civilian users. With a GPS receiver connected to a GPS antenna, a user can receive the GPS signals, which can be used to determine his or her position anywhere in the world. GPS is currently available to all users worldwide at no direct charge.
How it work?When a GPS receiver is first turned on, it downloads orbit information from all the satellites called an almanac.Once this information is downloaded, it is stored in the receiver’s memory for future use. The GPS receiver calculates the distance from each satellite to the receiver by using the distance formula: distance = velocity x time.The receiver determines position by using triangulation. When it receives signals from at least three satellites the receiver should be able to calculate its approximate position (a 2D position). The receiver needs at least four or more satellites to calculate a more accurate 3D position. The position can be reported in latitude/longitude.
The two GPS codes are;-
Coarse acquisition (or C/A-code)
Precision (or P-code).
The C/A-code is modulated onto the L1 carrier only, while the P-code is modulated onto both the L1 and the L2 carriers. This modulation is called biphase modulation, because the carrier phase is shifted by 180° when the code value changes from zero to one or from one to zero.
Source of GPS error
Satellite clock errors: Caused by slight discrepancies in each satellite’s four atomic clocks. Errors are monitored and corrected by the Master Control Station.
Orbit errors:Satellite orbits.
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1. What is GPS
Architecture of GPS
How does GPS works
GPS Satellite Geometry
Sources of GPS Errors
Other Satellite Navigation
System
Applications
Conclusion
Reference
2. What is GPS:
It is a satellite-based navigation system.
Made up of a network of 24 satellites circulating around
earth orbit by the U.S. department of defense (USDOD).
The first satellite was developed in 1960 to allow ships in the
U.S. Navy to navigate the oceans more accurately.
GPS was originally intended for military applications, but in
the 1980, the government made the system available for
civilian use.
GPS permits land, sea, and airborne user to determine their
three-dimensional position, velocity and time.
3. Architecture of GPS:
To run all the system of GPS technology properly, highly advance architecture
of GPS has been developed that includes three major segments called the space
segment, control segment and a user segment.
4. Three Segments of GPS-
Minimum of 24 satellites
(currently 32) in orbit around
earth at altitude 20,000 km.
It transmit radio-navigation
signals, and store and
retransmit the navigation
message sent by the control
segment.
a) Space Segment
5. combination of a master
control station, four dedicated
ground antennas and six
dedicated monitor stations.
responsible for the proper
functioning of all the
operation of GPS such as
changing unhealthy satellite
with a healthy one.
b) Control Segment
6. c) User Segment
Comprises of thousand of
U.S. and military users who
uses the secure GPS precise
Positioning service, and
millions of civil, commercial
and scientific users .
7. How does GPS works:
Each satellites broadcast radio signals with their location and
time.
GPS receivers receives radio signals, and used these data to
calculate its distance from at least four satellites.
Distance=Speed * Travel time
GPS radio signals are travel at the speed of light .
Both satellites and receiver generate the same psuedocode
signals.
Difference b/w the 2 signals is the travel time.
Then the receiver uses Trilateration method to define its exact
location on Earth.
8. If we know the distance b/w the satellite and the receiver for:
1 satellite, the receiver’s location is known within a sphere.
Trilateration Process
10. 3 satellite, the receiver’s location is somewhere on at most two 3D
regions.
11. 4 satellite, the region gets smaller because of the sphere of the new
satellite.
12. GPS Satellite Geometry:
Satellite Geometry can affect the quality of GPS signals and
accuracy of receiver trilateration.
Position Dilution of Precision (PDOP) is the DOP value used
most commonly in GPS to determine the quality of a
receiver’s position.
It’s usually depend on the GPS receiver to pick satellites
which provides the best position triangulation.
13. If the satellites are well separated and equally apart from each
other it will form a well sphere and give less intersection point and
receiver can get an accurate result.
Two Types of Satellite Geometry
a) Ideal Satellite Geometry-
14. Poor satellite geometry are formed when satellites are not equally
apart to each other and provide more intersection area of receiver’s
position resulting inaccurate position.
b) Poor Satellite Geometry-
15. Sources of GPS Error:
Source Amount Of Errors
Satellite clocks: 1.5 to 3.6 meters
Orbital errors: <1 meter
Ionosphere: 5 to 7 meters
Troposphere: 0.5 to 0.7 meters
Multipath: 0.6 to 1.2 meters
Selective Availability: (depends on USDOD)
User errors: Up to a kilometer or more
16. Other Satellite Navigation System:
GLONASS- Russia’s global navigation system. Fully operational worldwide.
Galileo- Developed by the European Union and other partner countries,
planned to be operational by 2016 (and fully operated by 2020).
Beidou- People’s Republic of China’s regional system, currently limited to
Asia and west pacific.
COMPASS- People’s Republic of China’s global system, planned to be
operational by 2020.
IRNSS- India’s regional navigation system, covering India and Northern
Indian Ocean: GPS Aided GEO Augmented Navigation (GAGAN).
QZSS- Japanese regional system covering Asia and Oceania.
17. Applications:
In-vehicle Navigation (car, boat, aircraft etc.)
Weather and Traffic Alerts
Geologic Research and Mining
Military Navigation (Intelligence and target locations, Weapon Aiming)
Mapping and Surveying
Precision Agriculture
Robotics (Self navigating and Autonomous robots)
Tectonics (motion measurement of earthquakes)
Recreation (Geocaching ,Geodashing, way marking and location based
mobile games)
18. Conclusion:
The applications using GPS are constantly growing.
More reliable and accurate measurements.
The cost of the receiver is dropping.
More affordable and accessible to consumers.