GPS站坐标中的交点年周期误差研究  

Study on the draconitic year errors in GPS station coordinates

作　　者：李敏[1] 郭仕伟 魏娜[1] 施闯[1] 龚汉明 LI Min;GUO Shi-wei;WEI Na;SHI Chuang;GONG Han-ming(GNSS Research Center, Wuhan University, Wuhan 430079, China;Wuhan Geomatics Institute, Wuhan 430022, China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉430079 [2]武汉市测绘研究院,武汉430022

出　　处：《地球物理学进展》2018年第2期473-478,共6页Progress in Geophysics

基　　金：国家重点研发计划(2016YFB0501802);国家自然基金面上基金(41574027);国家杰出青年科学基金(41325015)联合资助

摘　　要：随着数据处理精度的不断提高,GPS交点年周期误差对定位精度的影响已不可忽略.本文采用Lomb-Scargle周期图法对IGS首次处理和两次重新处理的GPS站坐标时间序列进行了频谱分析,研究了IGS数据处理策略的改进对GPS交点年周期误差的影响,并初步分析了其产生机制.频谱分析表明:站坐标残差的NEU方向都存在明显的基频为1.04 cpy的GPS交点年周期误差,而误差改正模型精度的提高使得两次重处理的站坐标残差中的虚假周期性误差更加明显;和第一次重处理相比,第二次重处理奇数频谱的GPS交点年周期误差明显减弱,改进的原因可能与第二次重处理中加入了地球辐射压改正有关.同时,在基于GPS/GLONASS联合解算的站坐标残差序列(CODE与ESA)中还存在与GLONASS轨道重复周期相关的约8天的误差.The effects of GPS draconitic year errors on the accuracy of GNSS positioning cannot be neglected, with the improving precision of GNSS products. The study has been conducted on GPS station coordinate time series obtained from the first operational,first reprocessing and second reprocessing campaigns by means of the Lomb-Scargle periodogram,focusing on the effects of updated data processing methodology on GPS draconitic year errors,and preliminarily researching the mechanism about how these anomalous periodic errors are produced. Pervasive harmonic signals with a fundamental of 1. 04 cpy have been observed in the power spectra of the North, East and Up components of GPS station position residuals,and these anomalous periodic errors in station position residuals derived from two reprocessing campaigns are more prominent because of improved accuracy of error models,while odd draconitic signals of the second reprocessing campaign are weakened compared to the first reprocessing campaign, which can be attributed to the impact of Earth radiation pressure. What ＇s more,the power spectra of CODE＇s and ESA＇s residuals obtained by both GPS and GLONASS data shows distinct peak at period of about 8 days, close to the nominal ground repeat period of GLONASS satellites.

关 键 词：GPS交点年周期误差 时间序列 Lomb-Scargle周期图 

分 类 号：P228[天文地球—大地测量学与测量工程]