ROPP反演软件算法及其精度分析  

Inversion Algorithms and Precision Analysis of ROPP

作　　者：王大钊[1,2] 白伟华[2] 孙越强[2] 孟祥广[2] 王冬伟[2] 李伟[2] 

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院空间科学与应用研究中心,北京100190

出　　处：《空间科学学报》2015年第3期350-355,共6页Chinese Journal of Space Science

基　　金：中国科学院科研装备研制项目资助(YZ201129)

摘　　要：介绍了ROPP反演软件中无线电掩星反演的算法与精度分析.采用COSMIC卫星2008年1月1日全天的附加相位数据,反演得到折射率、温度、压强与湿度等参数,并与CDAAC相应结果进行对比实验结果表明,在30 km高度以下,折射率、压强和湿度的相对误差在2%以内,温度误差不超过2 K.The unique combination of global coverage,high precision,high vertical resolution,longterm stability and all-weather viewing of radio occultation will enhance the data sets of numerical weather prediction and improve the precision of Numeric Weather Prediction(NWP).And data assimilation requires preprocessing of the raw radio signals into the bending angles and refractivity.Then the atmospheric parameters such as temperature,pressure and humidity can be retrieved through data variational assimilation.The procedures for processing of radio occultation data,especially several important steps are introduced.And comparative analysis between these results and those from CDAAC shows that below the altitude of 30 km,the relative errors of refractivity,pressure and humidity are within 2%and the deviation of temperature is below 2 K.The results are also compared with the data from ERA-interim model of ECMWF and similar conclusion is obtained.

关 键 词：无线电掩星 折射率 大气参数 ROPP 

分 类 号：P412.2[天文地球—大气科学及气象学]