Scatterometry quik scat
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The QuikSCAT satellite was launched in 1999 to measure wind speed and direction over the global oceans. It carried the SeaWinds scatterometer which used a rotating antenna to capture measurements across a wide swath from two beams. The satellite orbited at an altitude of 803 km with an inclination of 98.6 degrees, allowing it to sample over 90% of the oceans every 24 hours. The scatterometer measured radar backscatter from ocean surfaces under different wind conditions to retrieve wind data using observing geometry and roughness models.
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OHPIGARSS2011maeda1.pptx
This document summarizes an analysis of interference to spaceborne microwave radiometers operating in the 6-7 GHz band from downlinks of mobile satellite systems. It finds that interference exceeds acceptable levels in some cases, particularly when there is specular reflection from the ocean surface. The analysis is the first to quantify interference levels in ocean areas. Protection of the 6-7 GHz band for passive sensing is important but current radio regulations do not provide adequate protection.
Satellite Application
The document discusses the history and development of India's space program and satellite technology. It summarizes that India launched its first satellite in 1975 using foreign satellites, conducted its own experiments in the 1970s, and launched its first experimental communication satellite in 1981. It then describes India's INSAT domestic communication satellite system, which now serves television and communication needs across India with multiple satellites.
Flight Dynamics Software Presentation Part II Version 7
This document describes modules in the Orbit and Attitude Simulator (OR.A.SI) software for analyzing celestial events that can impact infrared Earth sensors (IRES) on geosynchronous spacecraft, performing mission analysis of multiple collocated spacecraft, and verifying collocation configurations meet minimum separation requirements through Monte Carlo analysis. Key capabilities include modeling IRES sun and moon blinding effects, eclipse phenomena, and stationkeeping maneuvers with error simulation over long duration missions of collocated spacecraft. Configuration tools initialize inclination-eccentricity separation of multiple spacecraft clusters and ensure minimum separations considering orbit determination and maneuver execution uncertainty.
Rs satellites catelogue 2012
This document provides a catalogue of remote sensing satellites and their sensors. It begins with an introduction to satellites, their definitions and categories. It then describes remote sensing and provides details on over 300 sensors used on various satellites. The document is produced by students for a class project on remote sensing satellites, with the goal of providing a comprehensive reference of satellite datasets and criteria like names, altitudes, resolutions and more. It covers sensors for observing weather, crops, natural resources and changes on Earth's surface.
GIS Plateform and satellite
Remote sensing platforms can be satellites or aircraft that carry sensors to record wavelengths of energy reflected or emitted from the Earth's surface. Common satellite platforms include Landsat and SPOT, which have multispectral sensors that image the surface at spatial resolutions from 5-80 meters. Satellite orbits vary depending on the purpose, and include low Earth, sun-synchronous, and geostationary orbits. Near-polar orbiting satellites have orbits that cross the poles and combine with the Earth's rotation to provide global coverage over time. Remote sensing provides valuable data for applications in civil engineering and other fields.
Sheet # 1
This document discusses orbital mechanics concepts including:
1) Calculating orbital parameters like velocity and period for satellites in circular orbits between 322-1400 km altitude.
2) Designing an observation satellite orbit with a 4 hour period to pass directly over a ground station every 4 hours at an elevation angle above 10 degrees.
3) Computing the true anomaly of a satellite in an elliptical orbit with eccentricity 0.15 and semi-major axis of 9000 km at a height of 2000 km.
4) Determining the velocities of satellites in both circular and elliptical orbits at the same orbital radius.
5) Relating the orbital periods of two satellites with semi-major axes of 18000 km
Sentinel Satellites
The purpose of choosing this topic is to aware you about sentinel satellites that leads to new discoveries and ultimately changes the arena of Remote Sensing.
An Earth-sized exoplanet with a Mercury-like composition
Earth, Venus, Mars and some extrasolar terrestrial planets1
have a mass and radius that is consistent with a mass fraction
of about 30% metallic core and 70% silicate mantle2
. At the
inner frontier of the Solar System, Mercury has a completely
different composition, with a mass fraction of about 70%
metallic core and 30% silicate mantle3
. Several formation or
evolution scenarios are proposed to explain this metal-rich
composition, such as a giant impact4, mantle evaporation5
or the depletion of silicate at the inner edge of the protoplanetary
disk6. These scenarios are still strongly debated.
Here, we report the discovery of a multiple transiting planetary
system (K2-229) in which the inner planet has a radius
of 1.165 ± 0.066 Earth radii and a mass of 2.59 ± 0.43 Earth
masses. This Earth-sized planet thus has a core-mass fraction
that is compatible with that of Mercury, although it was
expected to be similar to that of Earth based on host-star
chemistry7
. This larger Mercury analogue either formed with
a very peculiar composition or has evolved, for example, by
losing part of its mantle. Further characterization of Mercurylike
exoplanets such as K2-229 b will help to put the detailed
in situ observations of Mercury (with MESSENGER and
BepiColombo8) into the global context of the formation and
evolution of solar and extrasolar terrestrial planets.
A highly magnetized twin-jet base pinpoints a supermassive black hole
Supermassive black holes (SMBH) are essential for the production of jets in radio-loud active galactic nuclei (AGN). Theoretical
models based on (Blandford & Znajek 1977, MNRAS, 179, 433) extract the rotational energy from a Kerr black hole, which could
be the case for NGC1052, to launch these jets. This requires magnetic fields on the order of 103 G to 104 G. We imaged the vicinity
of the SMBH of the AGN NGC1052 with the Global Millimetre VLBI Array and found a bright and compact central feature that is
smaller than 1.9 light days (100 Schwarzschild radii) in radius. Interpreting this as a blend of the unresolved jet bases, we derive the
magnetic field at 1 Schwarzschild radius to lie between 200 G and 8:3 104 G consistent with Blandford & Znajek models.
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An Earth-sized exoplanet with a Mercury-like composition
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Scatterometry quik scat
- 1. Radar Remote Sensing M.Safdar Dept.SS IST7/2/2014 1
- 2. 7/2/2014 Dept.SS IST 2 1- Introduction 1.1- Main Parameter 1.2- Processing Scheme 2- System Description 2.1 Mission Description 2.2 Satellite Description 2.3 Data Structure 3- Principle of Operations 4- Wind Speed and Wind Direction 5.1 Observing Geometry 5.2 Wind Retrieval 5- Rayleigh Roughness Criteria 6- Fan Beam
- 3. 7/2/2014 Dept.SS IST 3 Launched in 1999 and out off work in 2009 The Sea Winds scatterometer on the QuikSCAT satellite 25-km measurements across a 1600-km swath, samples more than 90% of the global ocean every 24 hours Introduction Main Parameters
- 4. QuikSCAT satellite Components 7/2/2014 Dept.SS IST 4
- 5. 7/2/2014 Dept.SS IST 5
- 6. 7/2/2014 Dept.SS IST 6
- 7. 7/2/2014 Dept.SS IST 7 Mission Description
- 8. 7/2/2014 Dept.SS IST 8
- 9. 7/2/2014 Dept.SS IST 9 Required period 4 days(57 orbits) Orbital period 101 minutes(14.25 orbits/days) Local Sun time at Ascending 6:00 AM ± 30 minutes Altitude above equator 803 km Inclination 98.616 Table 1 - Nominal Orbital Parameters
- 10. 7/2/2014 Dept.SS IST 10 Alternate view of the SeaWinds dual-beam scanning concept (image credit: University of Central Florida) Detailed view of SeaWinds scanning geometry (image credit: Brigham Young University) Satellite Description
- 11. 7/2/2014 Dept.SS IST 11 Principle of Operation Satellite Description
- 12. 7/2/2014 Dept.SS IST 12 The diagram bellow shows the QuikSCAT satellite in position over the ocean Rotating pencil-beam scatterometer
- 13. 7/2/2014 Dept.SS IST 13 QSCAT viewing geometry (Spencer et al., 2000).
- 14. 7/2/2014 Dept.SS IST 14 Response of radar backscatter to different surface roughness criteria: (a) smooth, (b) intermediate, and (c) rough (Sabins, 1997) Angular variation of backscatter for different roughness conditions (Ulaby et al., 1982b).
- 15. 7/2/2014 Dept.SS IST 15 Sequence of pulses returned to the receiver showing the fading (variability of signal levels) on a pulse-to-pulse basis (Moore, 1983).
- 16. 7/2/2014 Dept.SS IST 16 Example of a fan-beam scatterometer (Ulaby et al., 1982).
- 17. 7/2/2014 Dept.SS IST 17 QSCAT scanning pattern showing helixes traced by the inner beam (light shade) and outer beam (dark shade) as spacecraft orbits (Spencer et al., 1997).
- 18. 7/2/2014 Dept.SS IST 18 Swath coverage spanning several days showing the crossing patterns of ascending (top) and descending (middle) orbit passes over northern South America, along with the combination of both (bottom) (Long et al., 1993).
- 20. 7/2/2014 Dept.SS IST 20 Thanks