FY-3C微波湿温探测仪辐射测量特性  

Radiometric Characteristics of FY-3C Microwave Humidity and Temperature Sounder

作　　者：郭杨[1,2] 卢乃锰[2] 谷松岩[2] 何杰颖[3] 王振占[3] 

机构地区：[1]南京信息工程大学,南京210044 [2]国家卫星气象中心中国气象局中国遥感卫星辐射测量和定标重点开放实验室,北京100081 [3]中国科学院空间科学与应用中心,北京100190

出　　处：《应用气象学报》2014年第4期436-444,共9页Journal of Applied Meteorological Science

基　　金：公益性行业(气象)科研专项(GYHY201206002);国家高技术863计划(201IAA12A104);国家自然科学基金项目(41201360)

摘　　要：2013年9月发射的FY-3C是我国第2代极轨气象卫星的第3颗星,其上装载的微波湿温探测仪在118 GHz氧气吸收线和183 GHz水汽吸收线设计了两组大气探测通道,在大气窗区设置了89 GHz和150 GHz探测通道。为保证微波湿温探测仪在轨定量应用,卫星发射前完成了地面热真空试验。该文介绍了热真空定标试验原理,并对FY-3C微波湿温探测仪正样产品真空试验数据进行了定量分析。数据分析结果表明:FY-3C微波湿温探测仪正样产品15个探测通道的灵敏度均满足设计指标要求,各通道观测亮温间相对独立,定标准确度优于1.6 K,真空试验过程中微波湿温探测仪定标结果稳定。FY-3C微波湿温探测仪发射前热真空定标特性分析结果为仪器在轨定量应用奠定了基础。The microwave humidity sounder （MWHS）is a five channel microwave radiometer in the range of 150-191 GHz onboard FY-3A and FY-3B.FY-3A and FY-3B are successfully launched in 2008 and 2010,re-spectively.The next generation of MWHS is a microwave humidity and temperature sounder.This sensor is developed to fly on the third satellite of new generation polar orbit meteorological satellite of China （FY-3C）is launched in September 2013. The microwave humidity and temperature sounder has 15 channels in the range of 89 - 191 GHz. Eight temperature sounding channels with central frequency of 118.75 GHz oxygen gas line and five hu-midity sounding channels with central frequency of 183.31 GHz water vapor line.Two window channels center at 89 GHz and 150 GHz.118 GHz channel is first used to detect atmosphere on current operational＆amp;nbsp;satellite.Channels in the oxygen band are at around 54 GHz used by AMSU-A （advanced microwave sounding unit-A）and ATMS （advanced technology microwave sounder）.Channels in the next oxygen ab-sorption band are at around 118.75 GHz,which can well detect atmosphere temperature in the lower trop-osphere.The temperature sounding channels around 118.75 GHz detect the atmosphere temperature from 900 hPa to 25 hPa.The microwave humidity and temperature sounder adds two humidity sounding chan-nels compared with MWHS that can obtain fine vertical distribution structure of atmosphere humidity. In order to determine the radiometric performance and the on-orbit use of the microwave humidity and temperature sounder,an extensive test is performed before launch.The microwave humidity and tempera-ture sounder is placed in a thermal-vacuum chamber where the cold and earth targets are installed at fixed position.The instrument temperature is controlled at 5℃,15℃ and 25℃ which is expected in orbit.The temperature of earth target maintains from 95 K to 330 K and space target is controlled at 95 K.Tempera-tures of these whole targets are measured by PRT （platinum resistance thermometer

关 键 词：FY-3C气象卫星 微波湿温探测仪 辐射特性 热真空定标试验 

分 类 号：P407.7[天文地球—大气科学及气象学]