一种实时卫星钟差预报模型及其应用
A prediction model of real time satellite clock error and its application
刘辉 1吴波1
作者信息
- 1. 江西省国土资源测绘工程总院有限公司,南昌 330000
- 折叠
摘要
针对基于全球卫星导航系统的(GNSS)实时精密单点定位(PPP)依赖高精度实时卫星钟差和轨道改正数服务,而短期通信中断易造成国际GNSS服务组织(IGS)的实时服务不可用的问题,提出一种基于二次多项式加八阶谐函数的卫星钟差短期预报方案:采用四分位法对实时卫星钟差历元间差分序列进行粗差探测与剔除,并用于计算钟差模型系数;然后对通信中断时期的实时钟差历元间差进行预报;最后结合实时服务中断前接收的最新钟差恢复中断时期的卫星钟差.实验结果表明:当通信短期中断时,采用 2 h数据建模可获得平均标准偏差 0.184 ns的预报钟差精度,对铷钟的钟差预报精度优于铯钟;所提 2 min钟差预报方案可达到与 IGS发布的实时卫星钟差产品相当的动态 PPP精度,能够保障实时高精度定位应用的连续性和稳定性.
Abstract
Aiming at the problem that global navigation satellite system(GNSS)real-time precise point positioning(PPP)relies on high-accuracy real-time satellite clock and orbit corrections services,while short-term communication interruptions can easily cause the real-time service of International GNSS Service(IGS)to be unavailable,the paper proposed a satellite clock error short-term prediction scheme based on quadratic polynomials and eighth-order harmonic-based function:the quartile method was adopted to detect and eliminate gross errors in the real-time satellite clock error sequence between epochs,and to calculate the clock error model coefficients;then,the real-time clock error between epochs during communication interruption was predicted;finally,the satellite clock error during the interruption period was recovered by combining the latest clock error received before the real-time service interruption.Experimental results showed that when communication was interrupted for a short period,the clock error prediction model modeled using 2-hour data could achieve a prediction accuracy of mean standard deviation(STD)of 0.184 ns,and the accuracy of rubidium clock error prediction would be better than that of cesium clock;moreover,the proposed clock error prediction scheme for 2 minutes could achieve kinematic PPP accuracy comparable to IGS real time satellite clock error products,ensuring the continuity and stability of real-time high-precision positioning applications.
关键词
卫星钟差/实时服务/通信中断/精密单点定位(PPP)/粗差探测Key words
satellite clock/real-time service/communication outage/precise point positioning(PPP)/gross error detection引用本文复制引用
出版年
2024
NETL
NSTL
万方数据