伪随机脉冲先验值对低轨卫星简化动力学定轨精度的影响  

Impact of Pseudo-Stochastic Pulse Priors on LEO Reduced-Dynamic Orbit Accuracy

作　　者：张兵兵[1,2] 王正涛 冯建迪[1] 邱耀东[1] ZHANG Bingbing;WANG Zhengtao;FENG Jiandi;QIU Yaodong(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;School of Geographic Science,Xinyang Normal University,Xinyang 464000,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]信阳师范学院地理科学学院,河南信阳464000

出　　处：《武汉大学学报（信息科学版）》2018年第8期1222-1227,1241,共7页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41274032,41210006,41474018);武汉大学地球空间环境与大地测量教育部重点实验室开放基金(17-02-02);信阳师范学院“南湖学者奖励计划”青年项目~~

摘　　要：低轨卫星简化动力学定轨中引入伪随机脉冲可有效提高定轨精度,但伪随机脉冲先验值（时间间隔、先验标准差）会影响伪随机脉冲估值大小,进而影响定轨精度。基于GRACE（Gravity Recovery and Climate Experiment）卫星轨道分析伪随机脉冲先验值对单天解简化动力学定轨精度的影响,实验表明,时间间隔从240min减至6min,先验标准差从1×10^-4 mm/s增至1×10^-1 mm/s,伪随机脉冲总的估值大小由1×10^-2mm/s增至1×10^-1 mm/s,定轨精度从几十cm提高到2cm;当先验标准差大于1×10^-1mm/s,继续增加先验标准差,伪随机脉冲估值不变,定轨精度不再提高。因此,对于单天解轨道,时间间隔减小至6min,先验标准差增至1×10^-1 mm/s,伪随机脉冲估值增大,定轨精度提高;继续增大先验标准差,伪随机脉冲估值不变,定轨精度不再提高。利用不同高度的Swarm卫星验证了该结论的有效性。Pseudo-stochastic pulses can improve the accuracy of LEO reduced-dynamic orbit determination effectively,but the pseudo-stochastic pulse priors（i.e.,time interval and a priori sigma）will affect the values of pseudo-stochastic pulse,thereby affecting orbit accuracy.In this paper,single-day GRACE orbit experiments based on reduced-dynamic method show that time interval decreases from 240 min to 6 min,apriori sigma increases from 1×10^-4 mm/s to 1×10^-1 mm/s,the total values of pseudo-stochastic pulse increases from 1×10^-2 mm/s to 1×10^-1 mm/s,and the orbit accuracy improves from tens of centimeters to 2 cm;when a priori sigma is greater than 1×10^-1 mm/s,apriorisigma continues to increase,the values of pseudo-stochastic pulse remain unchanged and the orbit accuracy unimproved.Therefore,for single-day orbit solution,time interval is reduced to 6 min,a priori sigma goes up to 1×10^-1 mm/s,the values of pseudo-stochastic pulse increases,the orbit accuracy improves;apriori sigma continued to increase,the values of pseudo-stochastic pulse keep unchanged,and the orbit accuracy is unimproved.Using Swarm orbit experiments of different heights can be used to verify the validation of the conclusion.

关 键 词：低轨卫星 简化动力学 伪随机脉冲 时间间隔 先验标准差 

分 类 号：P228[天文地球—大地测量学与测量工程]