顾及随机脉冲参数约束的BDS卫星精密定轨  

Precise orbit determination of BDS satellites considering pseudo-stochastic pulse parameter constraints

作　　者：张铭轩 祝会忠[1] 唐龙江[1] 杨虎[1] ZHANG Mingxuan;ZHU Huizhong;TANG Longjiang;YANG Hu(School of Geomatics,Liaoning Technical University,Liaoning Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学测绘与地理科学学院,辽宁阜新123000

出　　处：《导航定位学报》2023年第5期37-45,共9页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(42030109,42074012);卫星导航系统与装备技术国家重点实验室开放基金项目(CEPNT-2018KF-13);辽宁省重点研发计划项目(2020JH2/10100044);辽宁省“兴辽英才计划”项目(XLYC2002101,XLYC2008034,XLYC2002098)。

摘　　要：为了进一步完善北斗卫星导航系统(BDS)的动力学模型,提高其定轨精度,提出一种动力学模型的补偿方法来实现对BDS的精密定轨:在原有力学模型的基础上,每隔12h在BDS卫星轨道的径向、切向和法向附加一组随机脉冲参数,使其与确定性参数一起进行参数估计;并分别给出随机脉冲参数对非地影期和地影期BDS轨道精度的影响;最后将定轨结果与武汉大学分析中心提供的事后定轨结果进行分析与比较。实验结果表明,加入随机脉冲参数后,非地影期的北斗卫星导航(区域)系统(BDS-2)地球静止轨道(GEO)卫星、倾斜地球同步轨道(IGSO)卫星、中圆地球轨道(MEO)卫星以及北斗三号全球卫星导航系统(BDS-3)MEO卫星的轨道精度可分别提升5.1%、14.9%、14.8%、16.4%,对于进入地影期的BDS-2 MEO和BDS-3 MEO卫星,轨道精度可分别提升18.9%、27.3%,说明随机脉冲参数的引入可以在一定程度上弥补力学模型缺陷,进而提高BDS卫星的轨道精度,尤其是BDS-3卫星轨道精度提升更为显著,同时通过对外推轨道精度的分析进一步验证了提出方法的可行性以及定轨精度的准确性。In order to further improve the dynamic model of the BeiDou navigation satellite system(BDS)and increase its orbit determination accuracy,the paper proposed a compensation method of dynamic model to realize the precise orbit determination for BDS:based on the original mechanical model,a set of stochastic pulse parameters were attached to the radial,tangential and normal directions of the BDS satellite orbit every 12 h,and the parameters were estimated together with the deterministic parameters;then the influence of stochastic pulse parameters on the accuracy of BDS orbit in the non-geoshadow period and the geoshadow period were given;finally,the orbit determination results were comparatively compared with the post-orbit determination results provided by the Analysis Center of Wuhan University.Experimental result showed that after adding stochastic pulse parameters,the orbital accuracy of geostationary Earth orbit(GEO)satellites,inclined geosynchronous orbit(IGSO)satellites and medium Earth orbit(MEO)satellites of BeiDou navigation satellite(regional)system(BDS-2)and MEO satellites of BeiDou-3 global navigation satellite system(BDS-3)in the non-geoshadow period would be improved by 5.1%,14.9%,14.8%and 16.4%,respectively;and for BDS-2 MEO and BDS-3 MEO satellites entering the geoshadow period,the orbit accuracy would be improved by 18.9%and 27.3%,respectively,which indicates that the introduction of stochastic pulse parameters could make up for the defects of mechanical models to a certain extent,and then improve the orbital accuracy of BDS satellites,especially for BDS-3 satellites,the orbit accuracy could be enhanced significantly;furthermore,the feasibility of the proposed method and the accuracy of the orbit determination could be verified by the accuracy analysis of the extrapolated orbit.

关 键 词：伪随机脉冲 北斗卫星导航系统(BDS)精密定轨 地影期 力学模型 

分 类 号：P228[天文地球—大地测量学与测量工程]