HY-2D Calibration Microwave Radiometer

HY-2D Calibration Microwave Radiometer is the correction microwave radiometer payload on the HY-2D ocean dynamic environment satellite ^[1]. It is a fixed-beam passive microwave radiometer used to correct radar-altimeter wet path delay and wet tropospheric path delay ^[2]. The instrument uses 18.7, 23.8, and 37 GHz channels for atmospheric correction of the altimeter measurement path ^[2]. It performs passive microwave radiometry demonstrated on HY-2D for correction microwave radiometer calibration and wet-path-delay correction workflows ^[2]. The instrument has been active on HY-2D since May 2021, with estimated or assumed end of life at or beyond 2026 ^[1].