基于IGS区域网的卫星钟差实时估计及PPP精度分析  

REAL-TIME ESTIMATION OF SATELLITE CLOCK AND PPP PRECISION ANALYSIS BASED ON IGS REGIONAL NET

作　　者：江楠[1] 徐天河[2,3] 许艳[1] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]地理信息工程国家重点实验室,西安710054 [3]西安测绘研究所,西安710054

出　　处：《大地测量与地球动力学》2013年第5期44-48,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41174008);高等学校全国优秀博士学位论文作者专项(2007B51)

摘　　要：针对IGS发布的IGU超快速钟差不能满足实时精密单点定位(PPP)精度要求的情况,提出利用区域IGS网,基于IGU预报轨道进行实时钟差估计的方法,并利用PPP对实时估计出的钟差进行定位精度分析。结果表明:实时估计得到的钟差与IGS事后精密钟差产品互差的均方根优于0.1 ns;采用实时估计钟差,PPP的精度较IGU预报钟差PPP精度在X、Y、Z三个方向分别提高87.1%、81.8%、91.3%,3D精度提高87.4%,可达厘米级,其收敛时间也缩短一半。The IGU ultrarapid satellite clock provided by IGS can not meet the demand of the realtime precise point positioning （PPP） at present, the method of realtime clock estimation based on the IGU prediction orbit in the regional IGS net is proposed and the positioning precision of the realtime clock estimation using PPP is analyzed. Results show that, the RMS of difference between realtime clock estimation and IGS post precise clock product is less than 0.1 ns; compared to IGU prediction clock, the PPP precision improves 87.1%, 81.8%, 913% respectively in X, Y and Z directions when using the realtime estimated clock, and its 3D precision improves 87.4%, and the precision of realtime PPP can reach cm, the convergence time is shortened in half.

关 键 词：实时 卫星钟差估计 PPP IGU超快轨道 收敛时间 

分 类 号：P228.1[天文地球—大地测量学与测量工程]