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The NASA-ISRO Synthetic Aperture Radar (NISAR) Mission – Technologies and Techniques for Earth Science
October 22 @ 12:00 - 13:00 EDT
Webinar registration link: https://us02web.zoom.us/meeting/register/tZYrfuispzssH9UASjZHePI0Dg_rSTmWjTPv
The National Aeronautics and Space Administration (NASA) in the United States and the Indian Space Research Organisation (ISRO) are developing the NASA-ISRO Synthetic Aperture Radar (NISAR) mission, now planned for launch in 2023. The mission will map Earth’s surface every 12 days, on ascending and descending portions of the orbit, over all land and ice-covered surfaces. The mission’s primary objectives will be to study Earth land and ice deformation, and ecosystems, and support applications that benefit from systematic observations such as infrastructure monitoring, agriculture, soil moisture, and disaster response. The NISAR observatory carries two radars, one at L-band (24 cm wavelength) and the other at S-band (10 cm wavelength), each with a swath of over 240 km at fine resolution, using multiple polarizations depending on the observation target. To achieve these unprecedented capabilities, both radars use a reflector-feed system, whereby the feed aperture elements are individually sampled to allow a scan-on-receive (“SweepSAR”) capability at both L-band and S-band. The L-band and S-band electronics and feed apertures, provided by NASA and ISRO respectively, share a common 12-m diameter deployable reflector/boom system, provided by NASA. These two radars can operate simultaneously and both have on-board digital beamforming and filtering to reduce data rates. Nonetheless, they produce prodigious amounts of data, generating over 40 Terabits of data per day. Given the high data rates and ambitious coverage requirements, new technologies for high-rate Ka-band downlink complement these first-of-a-kind radar systems. The challenges of developing a complex multi-radar satellite jointly on opposite sides of Earth are great, and the global pandemic of 2020-2021 has certainly increased those challenges. This talk will present the technologies and techniques of NISAR, and describe the mission development process and progress.
Co-sponsored by: Geoscience and Remote Sensing Society
Speaker(s): Dr. Paul Rosen,