ISRO and NASA are jointly working on NISAR to launch dual frequency SAR satellite by 2021

The ISRO and NASA are jointly working on the NASA-ISRO Synthetic Aperture Radar (NISAR) mission to co-develop and launch a dual frequency (L & S Band) synthetic aperture radar satellite.
This earth monitoring satellite is scheduled to be launched in 2021. In this joint mission, NASA will be responsible for design and development of L-band SAR, 12m un-furlable antenna, GPS system and data recorder. ISRO will be responsible for design and development of S-band SAR, Spacecraft Bus, data transmission system, Spacecraft integration and testing, launch using GSLV and on-orbit operations. It is the first big collaboration between NASA and ISRO.