基于小时观测文件拼接的GPS实时钟差确定算法

GPS Real-Time Clock Bias Determination Algorithm Based on Connection of Hourly Observation Files

针对目前常用的GPS实时钟差确定算法主要基于实时观测数据流实现,使产品可靠性和完整性受限于网络质量,及广播星历和IGU-P精度较低的问题,提出并实现基于小时观测文件拼接的实时钟差确定算法。该算法基于小时观测文件数据,通过将钟差估计与自适应超短期钟差预报相结合以确定实时钟差。30 d实时在线结果显示,基于小时观测文件确定的实时钟差精度约为0.25 ns,优于广播星历和IGU-P,与IGS RTS提供的实时钟差精度相当,且能保证产品的可靠性和完整性。

Aiming at the problem that the current GPS real-time clock bias determination algorithm is based on real-time observation data stream,which limits the reliability and integrity of the product to the network quality,and that the accuracy of broadcast ephemeris and IGU-P is low,we propose and implement a real-time clock bias determination algorithm based on the connection of hourly observation files.The algorithm is realized based on hourly observation files data.By combining clock bias estimation with adaptive ultra-short-term clock bias prediction,the real-time clock bias is determined.30 days online result shows that,STD of GPS real-time clocks generated by the connection method is 0.25 ns,equal to IGS RTS,much higher than STD of broadcast ephemeris and IGU-P.Furthermore,this method can improve the reliability and integrity of GPS real-time clocks.