OSCAT-3 Scatterometer

OSCAT-3 is an active Ku-band rotating pencil-beam scatterometer for ocean surface wind-vector measurement on Oceansat-3 / EOS-06. It operates at 13.515 GHz with conical scanning and two beams, using incidence angles near 48.9 and 57.6 degrees ^[1]. The scatterometer uses HH and VV beams with a 1.4 m Cassegrain antenna, and its wind-vector product is centered on nominal 25 km cells with an experimental 12.5 km mode ^[2]. WMO OSCAR's instrument record defines a separate 1440 km swath figure for the rotating-beam geometry ^[1]. The mission ATBD instead documents 1400 km inner and 1800 km outer swaths, with the 1800 km outer swath representing OSCAT-3's overall ground coverage ^[2]. The Oceansat-3 deployment runs from February 2023 to 2027, with an expected Oceansat-3A deployment from September 2026 to 2030 ^[1]. Radar scatterometry is demonstrated on Oceansat-3 ^[1].