Diurnal variations of radio-frequency interference signal detected from FY-3G Microwave Radiation Imager-Rainfall Mission
Due to unprotected low-frequency microwave channels,brightness temperature observations are susceptible to signal contamination from active sensors,referred to as Radio-Frequency Interference(RFI).RFI signals reduce the accuracy of brightness temperature observations and their retrieval products.The Fengyun-3G satellite(FY-3G),recently launched by China,is equipped with a Microwave Radiation Imager-Rainfall Mission(MWRI-RM).MWRI-RM has 17 channels located in the frequency range from 10.65 to 183.00 GHz to enable passive remote sensing of Earth's atmosphere.Exploiting high correlations of brightness temperature among channels if no RFI,a normalized principal component analysis method was employed to detect RFI signals in FY-3G MWRI-RM brightness temperature observations.Unlike FY-3A/B/C/D,FY-3G MWRI-RM can observe the same location on Earth at different times,allowing for an investigation of diurnal variations in RFI.Results indicate that RFI signals do exist in MWRI-RM observations of brightness temperature at 10.65 GHz,with concentrated and scattered distributions in both China and Europe.Moreover,RFI signals indeed exhibit a diurnal variation,with higher intensity during daytime than nighttime.
FY-3G MWRI-RMdetection of radio-frequency interference signaldiurnal variations of radio-frequency interference signals
万方数据
维普
