Why in News
- NASA hands over NISAR satellite to ISRO
What is NISAR
- NISAR is a Low Earth Orbit observatory jointly developed by NASA and ISRO, under an agreement in 2014
- NISAR will map the entire globe in 12 days and provide spatially and temporally consistent data for understanding changes in Earth’s ecosystems, ice mass, vegetation biomass, sea level rise, groundwater and natural hazards, including earthquakes, tsunamis, volcanoes and landslides.
- The goal of NISAR is to make global measurements of the causes and consequences of land surface changes using advanced radar imaging.
- It consists of L and S band Synthetic Aperture Radar(SAR), which makes it a dual-frequency imaging radar satellite.
- NASA provides the L band radar, GPS while ISRO provides the S band radar, GSLV launch vehicle.
- Another important component of the satellite is its large 39-foot stationary antenna reflector. Made of a gold-plated wire mesh, the reflector will be used to focus “the radar signals emitted and received by the upward-facing feed on the instrument structure.