— Cosmic Penguin (@Cosmic_Penguin) September 21, 2020. RISAT-2 was used to search for and eventually locate wreckage of the helicopter crash that claimed the life of Y. S. Rajasekhara Reddy, Chief Minister of the State of Andhra Pradesh, as well as the lives of his fellow passengers, while traveling over dense jungles in southern India on Sep 2, 2009. Orbit: Sun-synchronous near-circular dawn-dusk orbit, altitude = 536 km, inclination = 97.552º, period = 95.49 minutes, LTAN (Local Time on Ascending Node) at 6 hours and 18 hours. Communication is established using satellite links, terrestrial links and dedicated fiber links. Legend to Figure 17: The image is a two date composite of Oct. 25 and Nov. 19, 2012 with the SAR instrument of RISAT-1 observing in MRS (Medium Resolution ScanSAR) operating mode. The RISAT-SAR system is designed to provide a constant swath for all elevation pointing and almost near-constant minimum radar cross section performance. The active beam-width in elevation direction is controlled such that for each beam a 25 km swath with near identical σο performance is achieved irrespective of the elevation pointing.

The TTC (Telemetry, Tracking and Command) functions of the satellite in S-band are also supported by a network of ground stations. [5], Though ISRO sought to underplay the satellite's defence applications in its announcements, a substantial number of articles concerning RISAT-2 in the Indian media continue to refer to it as a "spy satellite". • FRS-2 (Fine Resolution Stripmap-2): 6 m x 4 m (Az x Range) resolution, 25 km swath, Quad polarization; Each TCU controls 24 TRCs (T/R Controllers), representing the 3rd level of the hierarchical structure. Each beam is centered at off-nadir intervals of ~ 9 km. 19), Figure 19: NRSC Ground Station in Antartica: captured by RISAT-1 in Dual Pol (HH+HV), image credit: ISRO. An option of yaw rotation for left–right imaging would have reduced the requirement of the number of beams by half. The RISAT-SAR instrument, designed and developed at ISRO/SAC (ISRO/Space Applications Center), Ahmedabad, India. 462-471, URL: http://www.currentscience.ac.in/Volumes/104/04/0462.pdf, 6) A. S. Kiran Kumar, “Significance of RISAT-1 in ISRO’s Earth Observation Program,” Current Science, Vol. 6). 19). To support these four tiles, a framed structure is evolved. The other operational spaceborne SAR instruments like on Radarsat-2, TerraSAR-X or COSMO Skymed, are equipped with specific linear polarimetric mode which is usually operated within the restricted coverage of 20° to 30° incidence angle, because of doubling of PRF (Pulse Repetition Frequency) and usually a specific imaging mode is dedicated for linear polarimetric operation.

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