Misra, Tapan; Rana, S. S.; Bora, V. H.; Desai, N. M. (CVN Rao and Rajeevjyothi Space Applications Centre (ISRO), Ahmedabad-380015, India)
SAR Payload of RISAT is currently under development and the development model of SAR is under integration. This payload is based on active antenna technology, and it supports variety of resolution and swath requirements in C-band. Both conventional stripmap and scanSAR modes are supported with dual polarization (co and cross) operation. Additionally a quad polarization stripmap mode is provided for availing additional resource classification. In all these modes resolutions from 3m-50 m can be achieved with swath ranging 30 km –240 km. On experimental basis, a sliding spotlight mode is also available. Development of this payload called for development of many new technologies ranging from MMICS, TR modules, miniaturised power supplies, high speed digitisers, dual polarized printed antenna and distributed control systems. A completely new bus of satellite is being designed for aiding the payload operation. All the basic building blocks have already crossed design stage and have undergone rigorous space qualification program.