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 ultrarapid satellite clock provided by IGS can not meet the demand of the realtime precise point positioning （PPP） at present, the method of realtime clock estimation based on the IGU prediction orbit in the regional IGS net is proposed and the positioning precision of the realtime clock estimation using PPP is analyzed. Results show that, the RMS of difference between realtime 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%, 913% respectively in X, Y and Z directions when using the realtime estimated clock, and its 3D precision improves 87.4%, and the precision of realtime PPP can reach cm, the convergence time is shortened in half.
出处
《大地测量与地球动力学》
CSCD
北大核心
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)
关键词
实时
卫星钟差估计
PPP
IGU超快轨道
收敛时间
real-time
satellite clock estimation
precise point positioning （PPP）
IGU ultra-rapid orbit
conver-gence time
