NSSC OpenIR  > 微波遥感部
Alternative TitleCalibration and Validation of Microwave Radiometer (RAD)on2aboard SZ24 Spacecraft
王振占; 李芸; 北京8701信箱
Source Publication遥感学报
Keyword神舟四号飞船 微波辐射计 外定标
Other AbstractThe multi-channel microwave radiometer (RAD) on-aboard SZ-4 spacecraft,was launched at the end of 2002,the first space-borne microwave radiometer in China. Due to lack of in-orbit calibration,the measurements have to be quantatively evaluated before applications.In the paper,we put forward a vicarious external calibration method for solving the problem. The method is to re-calibrate all RAD channels using the two type of targets with known microwave radiation characteristics on the surface of the Earth.The first target was global open ocean.We collected synchro 252 sea surface truths with RAD from NDBC buoys combined with radiosonde profiles from nearby islands,as well as geophysical products of TMI ( TRMM Microwave imager) , including sea surface temperature,wind speed,water vapor contents,and liquid water contents.After calculation using our radiative transfer equation developed for RAD,we got a synchro oceanic parameter database for RAD brightness temperature calibration.The warm end we chose was Amazon Rain Forest.We obtained 8 profiles for two stations within 50 km from the RAD nearest overpasses.The brightness temperatures were derived from applying a simpled emissivity model and atmospheric absorption model.We compared the re2calibrated brightness temperatures of RAD with those from SSM/I within 015 degree of latitudeand longtitude and within 2 hour of RAD overpasses above global open ocean.We found there exited a good consistency between those equivalent channales of RAD and SSM/ I,i.e.19.35GHz and 37.0 GHz.The correlation coefficient of the channales are 74.4 % and 60.1 % repectively for vertical and horizontal polarization of 19.35GHz. The poor correlation in 37GHz channels may contribute to the path differences of them since the incidence angles of RAD is 42.6 degree,while SSM/I 53.3 degree.We also compared brightness temperatures of RAD with measurements from a ground based microwave radiometer employed in the Nanhai experiment carried in February,2003.The largest discrepancies also showed in those of 37GHz.In general,due to the insuitable location of ground test and poor sync time,and only few provable measurements for comparisons with the temperatures of RAD were made.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Cited Times:9[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
王振占,李芸,北京8701信箱. 神舟四号飞船微波辐射计定标和检验(Ⅰ)--微波辐射计外定标[J]. 遥感学报,2004,8(5):397-403.
APA 王振占,李芸,&北京8701信箱.(2004).神舟四号飞船微波辐射计定标和检验(Ⅰ)--微波辐射计外定标.遥感学报,8(5),397-403.
MLA 王振占,et al."神舟四号飞船微波辐射计定标和检验(Ⅰ)--微波辐射计外定标".遥感学报 8.5(2004):397-403.
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