ISRO develops radar for joint earth observation satellite mission with NASA: Nasa-Isro SAR (NISAR) is a collaborative partnership between the dual-frequency L and S-band SAR for Earth Observation. “NISAR will be the first satellite mission to use two separate radar frequencies (L-band and S-band) to monitor shifts in the surface of our planet less than a centimetre across,” Nasa said. On 30 September 2014, Nasa and Isro signed an agreement to collaborate and launch NISAR, which is to be launched from Sriharikota Space Port in Andhra Pradesh in early 2022. Nasa provides an L-band SAR mission, a high-quality communication subsystem for science data, GPS receivers, a solid-state recorder and a payload data subsystem.
NISAR will observe Earth’s land and ice-covered surfaces globally with 12-day regularity on ascending and descending passes, sampling Earth on average every six days for a baseline three-year mission,” NASA said on the mission website. The width of the data strip collected along the length of the orbit track is greater than 150 miles (240 km), which enables the image of the entire Earth in 12 days, it has been claimed.
In multiple orbits, radar images would enable users to track changes in cropland and hazard sites, as well as to monitor ongoing crises, such as volcanic eruptions. The images will be precise enough to display local changes and broad enough to quantify regional trends.