基于状态协方差阵加权的GPS PPP应用研究  

Research of GPS PPP Based on Weighted State Covariance Matrix

作　　者：张继海 董绍武[1,2,3,4] 袁海波 广伟[2,3] ZHANG Ji-hai;DONG Shao-wu;YUAN Hai-bo;GUANG Wei(University of Chinese Academy of Sciences,Beijing 100049,China;National Time Service Center,CAS,Xi’an,Shaanxi 710600,China;Key Laboratory of Time-Frequency Standard,CAS,Xi’an,Shaanxi 710600,China;School of Astronomy and Space Science,UCAS,Beijing 100049,China)

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院国家授时中心,陕西西安710600 [3]中国科学院时间频率基准重点实验室,陕西西安710600 [4]中国科学院大学天文与空间科学学院,北京100049

出　　处：《电子学报》2020年第11期2196-2201,共6页Acta Electronica Sinica

基　　金：中国科学院国家授时中心“青年创新人才”(No.NTSC青创201804);中国科学院西部之光青年学者B类(No.XAB2019B13);国家自然科学基金(No.11773030)。

摘　　要：精密钟差以及天顶对流层时延是GPS PPP解算的重要参数.本文通过在PPP数据处理过程中加入基于更新迭代的状态协方差阵作为取权因子,分别在高精度时间比对和天顶对流层时延方面利用单向滤波以及双向加权滤波对PPP解算的钟差及对流层时延进行估计与分析.结果表明,在零基线比对方面,经加权估计的钟差标准偏差优于单向结果,提高在30%以上;在时间比对方面,利用加权估计的钟差与国际权度局发布的钟差在频率稳定度上水平相当;最后,在天顶对流层时延估计方面,两种方法相对于IGS分析中心公布的天顶对流层时延的残差均方根误差中,加权估计的天顶对流层时延也略有提高.The precision clock and zenith tropospheric delay(ZTD)are important parameters of GPS PPP solution.In this paper,the state covariance matrix based on update iteration is used for the weight calculation in GPS PPP data processing.The results of PPP are estimated by using one-way and two-way filtering weighted in time comparison and ZTD.The results show that in the PPP zero-baseline common clock comparison,the standard deviation to the time difference of the weighted is significantly better than that of the one-way,and the deviation is increased by more than 30%.The result of frequency stability is estimated with weighted is equivalent to the Bureau International des Poids et Mesures in time comparison.And the root mean square of residual to the final results between two methods and the results published by the IGS for the ZTD,the results of the weighted estimation are also slightly improved.

关 键 词：载波相位 取权因子 高精度时间比对 天顶对流层时延 

分 类 号：TH714[机械工程—测试计量技术及仪器]