气象科技进展Issue(4)：43-49,7.DOI:10.3969/j.issn.2095-1973.2013.04.005
风云三号A星微波湿度计探测通道定标分析
Calibration Analyses for Sounding Channels of MWHS Onboard FY-3A
摘要
Abstract
The Microwave Humidity Sounder (MWHS) is a ifve-channel microwave radiometer in the range of 150~191 GHz onboard FengYun 3 (FY-3). Before the launch of FY-3A, the intensive thermal vacuum (TVAC) tests for MWHS had been carried out in a 2-m TVAC chamber, and the basic parameters such as receiver nonlinearity were obtained. Four-year operation shows that the performance of FY-3A MWHS remains stabile. The variations among space views and warm target views in the interval of scan lines were generally within 20 counts. In addition, the temperature lfuctuation of the warm target in a single pass is within 0.5 K. Primarily, due to the nonlinearity correction obtained from the TVAC test, radiance measurements of MWHS agree well with NOAA-17 AMSU-B and NOAA-18 Microwave Humidity Sounder (MHS) data. Averaged brightness temperature differences between FY-3 MWHS and NOAA-17 AMSU-B, at simultaneous cross-overpass points, are less than 1.08 K for the channels at 183±1 GHz. In the observation-minus-background comparison, the observed and simulated brightness temperature biases of FY-3 MWHS and NOAA-18 MHS exhibit similar performance in the 183.31±1 GHz channel;but in the 183.31±7 GHz channel, MWHS agrees better with background. It is anticipated that FY-3 MWHS data will contribute to numerical weather prediction.关键词
FY-3A MWHS/定标/交叉对比Key words
Calibration/cross comparison/FY-3A MWHS引用本文复制引用
谷松岩,郭杨,王振占,卢乃锰..风云三号A星微波湿度计探测通道定标分析[J].气象科技进展,2013,(4):43-49,7.基金项目
国家重点基础研究发展计划（973计划）项目（2010CB951600）；国家高新技术研究发展计划（863计划）项目 （）
