CHAMP观测资料的振幅反演初步结果  

Preliminary Results of the Amplitude Retrieval from CHAMP Observation Data

作　　者：严豪健[1] 张贵霞[1] 郭鹏[1] 刘敏[1] 洪振杰[2] 

机构地区：[1]中国科学院上海天文台 [2]温州师范学院数学与信息科学学院,浙江温州325027

出　　处：《天文学报》2005年第1期84-95,共12页Acta Astronomica Sinica

基　　金：CXJJ-97;国家自然科学基金10073017中国科学院知识创新工程重要方向项目KJCX2-SW-T1走天地球动力学研究中心资助

摘　　要：在几何光学和薄相位屏的假设下,给出GPS／LEO无线电掩星反演地球大气技 术中振幅反演的计算方法.从产生接收信号振幅变化的机制出发,提出产生信号振幅变化 的几何衰减和物理衰减两个不同的源.利用CHAMP卫星观测资料的个例,用观测信噪 比序列进行了大气弯曲角、大气折射率、压力、温度剖面的反演;并与相位反演结果进行 比较和讨论.Under the assumptions of geometric optics and thin phase screen the retrieval algorithms of amplitude in GPS/LEO occultation technique were listed. Geometric and physical decay sources producing observed signal amplitude variations were sorted according to their physical mechanisms. Using CHAMP observational data samples, the profiles of atmospheric bending, refractivity, pressure, and temperature were retrieved in tern by the series of signal noise ratio. The results were compared and discussed with that from phase process. The influences of both geometric and physical sources on the atmospheric retrievals were analyzed briefly.

关 键 词：CHAMP 反演 地球大气 无线电掩星 观测资料 卫星观测 大气折射率 接收信号 信噪比 相位 

分 类 号：P228[天文地球—大地测量学与测量工程] P631[天文地球—测绘科学与技术]