Abstract
Microwave Radiation Imager (MWRI) on-board FengYun-3D (FY-3D) meteorological satellite is a total power, 10 channel conic scan microwave imager. Observing land/ocean surface and atmosphere from 10GHz to 89GHz, V and H polarization. During the on-orbit test of FY-3D/MWRI, RFI effect was found in some area for 10GHz and 18GHz separately. Both calibration data, including warm target and cold target, and earth environment observing data was consider to cause the RFI noise. 1 month data was used to find out the error source, result show that most of the RFI noise comes from cold target. Different from other conic scan microwave imager on-orbit, such as AMSR2, SSMIS and GMI, FY-3D/MWRI using an end to end calibration mechanism. A big cold-target reflector (1 m in diameter) was used on the top of the platform. In some specific locations of the orbit, emission of different source was reflected by the cold-target reflector and then reflected by the main reflector to the receiver. Detail results show that for 10V channel and 10H channel, most of the RFI effect was found during the platform flying pass the west Europe (south of France), while for 18V channel and 18H channel, most of the RFI effect was found during the platform flying pass the west of North America (west part of Canada/US border). Compared with Geostationary satellite that in-orbit operation, we found that this result shows a good agreement with television transmission satellite, including location and operational frequency. Based on this result, a new filter algorithm was designed to do the correction. Result show that most of the RFI effect in the former area was corrected.
RFI Detection and Correction on Cold Target of FY-3D/MWRI
Microwave Radiation Imager (MWRI) on-board FengYun-3D (FY-3D) meteorological satellite is a total power, 10 channel conic scan microwave imager. Observing land/ocean surface and atmosphere from 10GHz to 89GHz, V and H polarization. During the on-orbit test of FY-3D/MWRI, RFI effect was found in some area for 10GHz and 18GHz separately. Both calibration data, including warm target and cold target, and earth environment observing data was consider to cause the RFI noise. 1 month data was used to find out the error source, result show that most of the RFI noise comes from cold target. Different from other conic scan microwave imager on-orbit, such as AMSR2, SSMIS and GMI, FY-3D/MWRI using an end to end calibration mechanism. A big cold-target reflector (1 m in diameter) was used on the top of the platform. In some specific locations of the orbit, emission of different source was reflected by the cold-target reflector and then reflected by the main reflector to the receiver. Detail results show that for 10V channel and 10H channel, most of the RFI effect was found during the platform flying pass the west Europe (south of France), while for 18V channel and 18H channel, most of the RFI effect was found during the platform flying pass the west of North America (west part of Canada/US border). Compared with Geostationary satellite that in-orbit operation, we found that this result shows a good agreement with television transmission satellite, including location and operational frequency. Based on this result, a new filter algorithm was designed to do the correction. Result show that most of the RFI effect in the former area was corrected.