区域实时双系统精密卫星钟差估计及PPP精度分析  

Estimation of regional real-time satellite clock offset and its PPP accuracy analysis

作　　者：李鹏远 王虎[2] 侯阳飞 LI Pengyuan;WANG Hu;HOU Yangfei(College of Surveying and Geo-Informatics,Tongji University,Shanghai 200092,China;China Academy of Surveying and Mapping,Beijing 100036,China)

机构地区：[1]同济大学测绘与地理信息学院,上海200092 [2]中国测绘科学研究院,北京100036

出　　处：《导航定位学报》2022年第5期81-90,共10页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41874042)。

摘　　要：针对精密单点定位对国际全球卫星导航系统服务组织(IGS)钟差产品过度依赖的问题,联合区域测站使用非差和历元间差相结合的方法,解算出区域实时全球定位系统(GPS)及格洛纳斯卫星导航系统(GLONASS)钟差产品作为自估钟差;将自估钟差和IGS实时钟差分别与欧洲定轨中心(CODE)最终5 s精密钟差产品进行比较分析。试验结果表明,自估的区域实时钟差产品与CODE最终5s精密钟差产品具有良好的一致性,可以满足实时卫星钟差精度的要求。在使用自估区域实时钟差产品的情况下,动态精密单点定位精度在北(N)、东(E)方向达到了5 cm,在天(U)方向达到了10 cm。自估区域钟差估计算法利用小区域测站,便可以获得与IGS全球实时钟差精度相当的实时区域钟差产品,这对自主区域高精度定位具有一定的实用价值。Aiming at the problem of precision single point positioning relying on the International Global Navigation Satellite System Service(IGS)clock offset products,a set of real-time Global Positioning System(GPS)/GLObal NAvigation Satellite System(GLONASS)clock offset product around China area is calculated basing on the combined un-difference and epochdifference estimation model by using some Continuously Operating Reference Stations(CORS)throughout China.On the one hand,this serves the regional area better,on the other hand,the high sampling rate of the regional satellite clock offset provides a guarantee for higher-precision positioning.Then,the difference between estimated clock and the IGS real-time clock is compared with the Centre for Orbit Determination in Europe(CODE)final precision clock offset product separately by using quadratic difference method.The experimental results indicate that the regional real-time precise satellite clock offset products are equal to CODE final products,which satisfy the precision requirements of satellite clock offset.In the case of using regional real-time clock offset products,the dynamic precise point positioning accuracy is about 5 cm in the N and E directions,and within 10 cm in the U direction.The regional clock offset estimation algorithm can obtain a real-time regional clock product with the same accuracy as the IGS global real-time clock offset by using small area stations,which makes the regional positioning more autonomous and controllable.

关 键 词：实时区域钟差估计 双系统 钟差精度 实时精密单点定位 定位精度 

分 类 号：P228[天文地球—大地测量学与测量工程]