Radar Satellite-1 (RISAT-1) is a state of the art Microwave Remote Sensing Satellite that can carry a synthetic aperture radar (SAR) payload operating in C-band (5.35 GHz). This radar enables imaging of the surface features during both day and night under all weather conditions. It was launched by ISRO on 26 April 2012 from SHAR Centre, Sriharikota, India and had a mission life of up to 5 years. This mission was carried out in PSLV-C19 launch vehicle and has a mass of 1858 Kg.

The primary objective of RISAT-1 is to provide all-weather, day-and-night Earth observation capabilities, particularly for applications in agriculture, forestry, soil moisture estimation, and disaster management. The satellite is designed to enhance India's capability to monitor and manage natural resources, support agricultural planning, and provide critical data during natural disasters.