GPS+BDS组合的实时定轨技术  

Real-Time Orbit Determination Using Combined GPS+BDS Systems

作　　者：姜洋[1] 张和芬[1] 汪精华[1] 于龙江[1] 张国斌[1] 李化义[2] 

机构地区：[1]北京空间飞行器总体设计部,北京100094 [2]哈尔滨工业大学卫星技术研究所,哈尔滨150080

出　　处：《南京航空航天大学学报》2015年第6期842-847,共6页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学青年基金(11302127;61304237)资助项目;中央高校基本科研业务费(HEUCFD1406)资助项目;国家高技术研究发展计划("八六三"计划)(2013AA122904)资助项目;哈尔滨市青年科技创新人才基金(RC2013QN001007)资助项目;黑龙江省自然科学基金(F2015032)资助项目

摘　　要：为了改善卫星几何分布,提高低轨(Low earth orbit,LEO)卫星实时定轨的精度与可靠性,提出了北斗卫星导航系统(Beidou navigation satellite system,BDS)与全球定位导航系统(Global positioning system,GPS)组合模型。组合模型基于加权最小二乘法(Weighted least square,WLS),利用伪距观测量建立观测模型,实时估计LEO卫星位置。目前,LEO卫星尚未装备星载BDS+GPS双模接收机,为验证算法可行性,利用GPS/BDS卫星星历文件与STK软件仿真生成实验数据。实验结果表明,BDS+GPS组合模型较GPS系统模型精度至少提高26%。A method that combined global positioning system with Beidou navigation satellite（GPS＋BDS）systems for real-time orbit determination is presented.There has been significant improvement in the satellites′geometric distribution and the accuracy of real-time low earth orbit（LEO）determination.A weighted least square（WLS）based algorithm using the pseudorange observations is developed to estimate position of LEO satellites for the combined systems.No LEO satellite operates with BDS＋GPS receivers at present.Hence the combined algorithm is required to be tested and verified by simulation through GPS/BDS broadcast ephemeris and STK software.Results show that the accuracy of the proposed combined algorithm is improved by over 26% compared with GPS-only algorithms.

关 键 词：实时定轨 GPS BDS 加权最小二乘法 

分 类 号：V249.32[航空宇航科学与技术—飞行器设计]