Advancements in system configuration, realization and characterization of EOS-04 SAR over its predecessor RISAT-1

The C-band Synthetic Aperture Radar (SAR) payload of Earth Observation Satellite (EOS-04), is a follow-on mission of Radar Imaging Satellite (RISAT-1). Though the overall configuration of the C-Band SAR payload has been retained from its predecessor, EOS-04 boasts of incorporating features, which target to keep up with the technological strides, and to improve the data quality. All the major modes of RISAT-1 are retained in EOS-04 whereas fine resolution stripmap-2 mode, which was quad-polarization mode earlier, is upgraded to full-polarization mode. The payload also has better repeat cycle with improved systematic coverage mode. This article covers system level advancements, and radio frequency and digital electronics hardware, implemen­ted in EOS-04. The satellite was launched on 14 February 2022 and since then all the major imaging modes are being operated successfully