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

作　　者：武美芳[1] 苏行[1,2] 张喆 WU Meifang;SU Hang;ZHANG Zhe(National Time Service Center,CAS,3 East-Shuyuan Road,Xi’an 710600,China;University of Chinese Academy of Sciences,A19 Yuquan Road,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安市710600 [2]中国科学院大学,北京市100049

出　　处：《大地测量与地球动力学》2020年第7期730-735,共6页Journal of Geodesy and Geodynamics

基　　金：中国科学院“西部青年学者”项目(XAB2018B19)。

摘　　要：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.

关 键 词：实时 钟差确定 钟差预报 小时观测文件 可靠性 

分 类 号：P228[天文地球—大地测量学与测量工程]