利用平滑广播星历的GNSS星载钟短稳评估方法  

Estimation Method of GNSS On-Board Clock Short-Term Stability Based on Smoothed Broadcast Ephemeris

作　　者：龚航[1] 刘增军[1] 彭竞[1] 王飞雪[1] 

机构地区：[1]国防科技大学电子科学与工程学院卫星导航定位技术工程研究中心,长沙市德雅路190号410073

出　　处：《武汉大学学报（信息科学版）》2013年第7期837-841,共5页Geomatics and Information Science of Wuhan University

基　　金：中国卫星导航学术年会青年优秀论文资助项目(CSNC2011-QY-11)

摘　　要：由于没有精密钟差数据,目前北斗和Galileo系统的一般用户很难获得精确的星载钟短期稳定度参数。在分析利用单个监测站观测数据实现星载钟短稳评估方法的基础上,提出了一种利用平滑广播星历的简单评估方法,给出了该方法的实现原理,并对其中的误差修正方法进行了讨论。利用GPS数据进行了有效性验证,与IGS的结果比较表明,该方法对800s平滑间隔内的短稳评估相对误差小于10%;与利用精密星历(PE法)和广播星历(BE法)两种方法的结果比较表明,本文方法与PE法获得的结果一致,优于BE法的评估性能。利用该方法对目前北斗所有11颗卫星(截至2012-08)的星载钟短稳进行了评估,其结果为6×10-12(τ=1s)、2×10-12(τ=10s)、5×10-13(τ=100s)、2×10-13(τ=1 000s)。It is difficult to obtain precise on-board clock short-term stability for current BDS and Galileo common users since there is no public precise clock data. Based on the analysis of single station estimation method of satellite on-board clock stability, this paper proposes a simple method based on smoothed broadcast ephemeris. The principle of this method is dis- cussed, followed by performance evaluation using GPS data. Compared to IGS final clock product and other two methods namely PE and BE which is based on precise ephemeris and broadcast ephemeris respectively, we conclude that the relative estimation error of the pro- posed method is less than 10% for average time of 1-800 s, which is consistent with the re- sults of PE method and better than BE method. The short-term stability of all the current BDS on-board clocks （until August 2012） are estimated by this method, with the results of 6 ×10^-12（r=1 s）, 2×10^-12（r=10 s）, 5×10^-13（r=100 s）, and 2〉〈10^-13（r=1 000 s）.

关 键 词：卫星导航系统 星载原子钟 短期稳定度评估 精密星历 平滑广播星历 北斗卫星导航系统 精密定轨与时间同步 

分 类 号：P228.41[天文地球—大地测量学与测量工程] TN967.1[天文地球—测绘科学与技术]