BDS伪距偏差改正对UPD估计的影响分析  

Impact of BeiDou satellite-induced code bias on UPD estimation

作　　者：徐运[1] 李昕[2] XU Yun;LI Xin(Tianjin Institute of Surveying and Mapping,Tianjin 300000,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]天津市测绘院,天津300000 [2]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘工程》2018年第4期29-33,40,共6页Engineering of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41404006)

摘　　要：针对BDS伪距偏差严重影响UPD估计的问题,提出基于单站伪距偏差改正的UPD估计方法,并利用香港地区18个连续运行参考站2016-01-04至2016-01-13的数据进行UPD估计,详细分析BDS卫星伪距偏差改正前后的宽巷和窄巷UPD特性。结果表明:BDS卫星伪距偏差会对宽巷UPD的结果引入将近0.5个整周的偏差,降低宽巷和窄巷UPD的数据利用率,改正伪距偏差后,宽巷UPD的一致性、数据利用率以及残差分布均得到显著提高,窄巷UPD的估计结果尤其是数据利用率也得到提高。Since the BeiDou satellite-induced code bias is detected and confirmed to be frequency-and elevation dependent,the characteristics of wide lane ambiguity has been changed and the extra bias will affect the UPD estimation.Therefore,the UPD estimation with code bias corrected is proposed.The data of eighteen CORS stations in Hong Kong from January 4 to January 13,2016 are used and this paper further analyzes UPD characteristics of wide-lane and narrow-lane UPD before and after the correction of satellite-induced code bias.The result shows that the BeiDou satellite code bias of wide-lane ambiguity is eliminated by correction model,the consistency,usage of data and residual distribution of wide lane UPD are improved significantly,and the UPD of narrow-lane ambiguity is also improved especial for the data usage rate.

关 键 词：伪距偏差 多路径组合 宽巷模糊度 窄巷模糊度 UPD估计 

分 类 号：P228.4[天文地球—大地测量学与测量工程]