Instrument performance and cross calibration of FY-3C MWRI

The MicroWave Radiation Imager (MWRI) onboard FengYun-3C (FY-3C) Satellite is a total-power radiometer observing earth surface and atmosphere at 10.65, 18.7, 23.8, 36.5 and 89 GHz with dual polarization. The on-orbit test of FY-3C MWRI was performed shortly after the launch of platform. Sensor performance factors include receiver sensitivity black body stability and scan period stability were tested. Beside those factors, many detail instrument parameters were also tested. Results indicate good performance of FY-3C MWRI. All of the factors are stable. Cross calibration between FY-3C MWRI\FY-3B MWRI\SSMIS\TMI were also performed during the onorbit test. The cross area include north/south polar, land and sea. The largest bias is 3.4K, which is the difference between FY-3C and SSMIS at sea surface area. Most of other biases are between 1K and 2K.