RISAT-1. Radar Imaging Satellite

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Ground Segment RISAT-1 ground segment comprises of various elements to support the space segment, data reception, data processing and dissemination. It includes planning and development of various software and hardware systems for mission management by Spacecraft Control Centre (SCC) at ISTRAC, Bangalore, including a network of international ground stations. Data reception, processing, archival and dissemination at National Remote Sensing Agency (NRSA), Hyderabad. ISRO Satellite Centre (ISAC), Bangalore and Space Applications Centre (SAC), Ahmedabad provides support for developing and operationalizing the mission and data product software. Spacecraft Control Centre (SCC): SCC is responsible for tracking the satellite, and carrying out mission operations. Using the existing ISTRAC Telemetry, Tracking and Command Network Stations at Lucknow, Bangalore, Bearslake, Mauritius and Biak mission operations, satellite health monitoring, health analysis, payload operations scheduling and payload programming are planned to be carried out with necessary interfaces with NRSA centre to cater to the user-driven payload programming requests. Being in dawn/dusk sun synchronous orbit, RISAT will have no visibility clash with other IRS satellites over a ground station. The other IRS satellites have 10.30 AM to 12 Noon equatorial crossing time for descending passes. Data Reception Station (DRS) Payload Data Reception is at NRSA Data Reception Station (DRS) at Shadnagar, Hyderabad with necessary augmentation for handling the high data rate of 320 Mbps on each of the reception chains. It is planned to have a 7.5 m dual shaped cassegranian antenna system with G/T of 32 dB/ deg.K in X-band. Auto diversity of X-band tracking receiver is planned to facilitate tracking on either of two channels namely RHC or LHC. The Data reception station has the capability to receive the RT data as well as the data stored onboard satellite, which will be played back in the visibility. The data reception and the first level of processing (Level-0) systems are collocated in the DRS itself. A H/W quick look/Near Real Time processor system facilitates a quick look viewing of the image to assess the health of the Payload system in real time. The first level of products are generated at the DRS itself after the payload pass using the ancillary information. Later the data is transported to the dataprocessing centre at Balanagar through storage media like DLT and also through network for further processing. Data Processing and Product Generation The Data Processing Systems are implemented at Balanagar NRSA. The SAR data processing, unlike the optical sensors, has to undergo signal processing, both in the range and in azimuth directions, before images are formed. The data products envisaged for RISAT mission could be generally categorized as browse, standard (geo-tagged and geocoded), value added and application specific products (precision geocoded, terrain geocoded, Pol-SAR products, large area mosaics etc.).
RISAT & Beyond RISAT-1 will be followed with improved versions of microwave payloads for the various applications as part of the land and water thematic series of IRS satellites planned under the Indian EO programme. As part of the strategy the coming years will see the development of X-band and L-band SAR system as well as L-band Synthetic Aperture Radiometer. These satellites will also provide necessary support for the disaster management applications. Radar Imaging Satellite Simulated images from Airborne SAR
Page 1 and 2: Radar Imaging Satellite Indian Spac
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RISAT-1. Radar Imaging Satellite

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