星钟和星历误差分离的广域差分新方法  

A Novel Wide Area Differential Method on Separated Calculation of Satellite Clock Errors and Ephemeris Errors

作　　者：蔡成林[1,2,3] 李孝辉[1] 吴海涛[1] 

机构地区：[1]中国科学院国家授时中心,陕西710600 [2]湖南人文科技学院,湖南417000 [3]中国科学院研究生院,北京100049

出　　处：《宇航学报》2009年第6期2165-2170,共6页Journal of Astronautics

基　　金：湖南省教育厅科学研究青年项目(08B039);国家自然科学基金委员会-中国科学院天文联合基金(10778715);"973计划"项目(2007CB815502)

摘　　要：针对WAAS等传统的广域差分方法存在DOP值太大和要求基准站时间严格同步等问题,提出了星钟和星历误差相对分离的广域差分新方法。提出的相对分离理论包括以所有卫星的广播星历为基准的星钟误差的相对分离,以各卫星星钟误差相对分离结果为基准的相对星历误差分离和固定偏差的星钟二次修正三部分,其可简单归纳为星钟-星历-星钟的修正思路。这种方法除无需基准站同步外,用户定位比WAAS准。理论论证和算例仿真证明这种理论是科学的,对建设各种卫星导航系统的差分增强系统均是适用的。Armed at the problems of the great dilution of precision （DOP） value and strict time synchronization among differential reference stations in Wide Area Augmentation system （WAAS） et at. traditional wide area differential method, a novel wide area differential method based on the relative separation between satellite clock errors and satellite ephemeris errors. The relative separation theory presented includes three parts： the separation of satellite clock errors relative to broadcast ephemeris, the separation of satellite ephemeris errors relative to that of satellite clock errors and the second correction on the fixed difference due to no correction of the reference satellite. It can be summarized as the corrective thought of satellite clock-satellite ephemeris-satellite clock. Besides no necessity of strict time synchronization among differential reference stations, this method can obtains more accu- rate user position than WAAS et at. It has proved to be scientific by theoretical and instance argumentation, and to be suitable for all kinds of wide area differential systems suited to satellite navigation systems.

关 键 词：精度衰减因子 广域差分 星钟误差 星历误差 修正量 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计]