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- Title
Synthetic Aperture Radar payload on-board RISAT-1: configuration, technology and performance.
- Authors
Misra, Tapan; Rana, S. S.; Desai, N. M.; Dave, D. B.; Rajeevjyoti; Arora, R. K.; Rao, C. V. N.; Bakori, B. V.; Neelakantan, R.; Vachchani, J. G.
- Abstract
2Formerly with Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India The launch of Radar Imaging Satellite (RISAT-1) marked a new chapter in the remote sensing programme of Indian Space Research Organisation (ISRO). RISAT-1, carrying a multi-mode Synthetic Aperture Radar (SAR) system, will provide complementary imaging capability in microwave along with optical images, being obtained from the well-established IRS class of satellites. RISAT-1 supports a variety of resolution and swath requirements. Both conventional stripmap and scanSAR modes are supported, with dual polarization mode of operation. Additionally a quad polarization stripmap mode is provided for availing additional resource classification. In all these modes, resolutions from 3 to 50 m can be achieved with swath ranging from 25 to 223 km. On experimental basis, a sliding spotlight mode is also available. In all the imaging modes, a novel polarimetry mode called circular or hybrid polarimetry can be exercised seamlessly. The system is capable of imaging on either side of the flight track depending upon prior programming of the satellite. The satellite is placed in a Sun-synchronous orbit with 6 am-6 pm equatorial crossing. This orbit configuration is chosen to maximize solar power availability. The satellite has an on-board-solid state recorder for supporting data acquisition beyond ground station visibility. The payload is based on active antenna array technology. Crucial technology elements like C-band MMICs, TR module and miniaturized power supplies have already been developed in India. A pulsed mode near-field test facility has also been developed in-house in order to characterize the payload in the integration laboratory itself.
- Subjects
AHMADABAD (India); INDIA; INDIAN Space Research Organisation; SYNTHETIC aperture radar; MICROWAVES; POLARIMETRY; SPACE launch industry; RISAT-1 (Radar imaging satellite)
- Publication
Current Science (00113891), 2013, Vol 104, Issue 4, p446
- ISSN
0011-3891
- Publication type
Article