Coming together of ISRO & NASA

ISRO and NASA are coming together to harness their strengths in building a satellite for a scientific mission. The mission involves measuring and characterization of carbon/biomass distribution on earth. The satellite will carry a Synthetic Aperture Radar (SAR) operating in dual frequency, L and S bands. NASA will contribute L band electronics and ISRO's contribution will be S band electronics. The satellite will most probably be based on ISRO's IRS bus and will be launched using ISRO's workhorse PSLV. This might be just the beginning of what could be a long term relationship between ISRO and NASA, based on the lines of  ISRO and CNES  partnership. 

ISRO has experience of designing dual band (L & S) SAR. Chandrayaan-2 will carrying one such dual band SAR. 

ISRO Dual band (L & S) SAR for CHandrayaan-2 (credit ISRO)

An abstract of a poster about the joint mission:

A Dual-frequency Spaceborne SAR Mission Concept for Carbon Disturbance Measurements and Characterization

Paul A Rosen, Jet Propulsion Laboratory, parosen@jpl.nasa.gov (Presenter)
Ralph Dubayah, University of Maryland, dubayah@umd.edu
Bradford H Hager, Massachusetts Institute of Technology, bhhager@mit.edu
Ian Joughin, University of Washington, ian@apl.washington.edu 

Since the 2007 National Academy of Science “Decadal Survey” report “Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond,” the National Aeronautics and Space Administration (NASA) has been studying concepts for a Synthetic Aperture Radar (SAR) mission to determine Earth change in three disciplines – ecosystems, solid earth, and cryospheric sciences. One of the most promising and original concepts involves an innovative international partnership between NASA and the Indian Space Research Organization (ISRO). Previous NASA concepts had focused on exploiting an L-band array-fed reflector SAR configuration that enabled > 200 km swath at full SAR resolution and full polarimetry simultaneously in order to meet requirements in all three disciplines. The electronics in this design are relatively compact, allowing for straightforward addition of feed array elements at other frequencies. As the partnership concept with ISRO developed, it became clear that flying dual L- and S-band SAR capabilities, with L-band electronics supplied by NASA and S-band electronics by ISRO, would satisfy science and application requirements of the US and India. A dual-frequency fully polarimetric SAR with the potential for global coverage every 12 days would offer unprecedented capability that researchers could exploit in new and exciting ways. The joint NASA/ISRO science requirements being formulated for ecosystems cover biomass disturbance, agriculture, wetlands and coastal processes, alpine vegetation, and high-resolution soil moisture. The two wavelength system has a number of advantages, including extending the sensitivity of biomass change and regrowth measurements to lower levels of biomass, improved classification of vegetation types, and possibilities for improved vegetation structure estimates, as well as mitigation of ionospheric effects. This poster will provide an overview of the conceptual system and highlight some of the anticipated science products.