Indian Space Research Organisation (ISRO) and Jet Propulsion Laboratory (JPL) of NASA are working on world's most expensive earth-imaging satellite to use dual frequency. Its name is ___________.

NISAR stands for NASA-ISRO Synthetic Aperture Radar. It is a joint earth-observation satellite project between NASA and ISRO. It is unique because it uses dual-frequency synthetic aperture radar (L-band and S-band) to map the entire globe systematically, monitoring changes in Earth's crust, ice sheets, and ecosystems.