BDS不同轨道卫星精密单点定位性能分析

为了分析北斗不同轨道卫星对定位结果的影响,从而更好地利用我国自主研发的北斗卫星导航系统。该文采用亚太地区7个MGEX测站12d观测数据,进行静态、后处理动态和模拟实时动态3种模式的精密单点定位实验。实验结果表明,在北斗3类轨道卫星等权的情况下,倾斜地球同步轨道(IGSO)卫星对定位结果贡献最大;北斗两类轨道卫星组合中,IGSO+MEO组合定位精度最高,其静态精密单点定位(PPP)在E、N、U方向的RMS分别为0.62、0.39、3.71cm,后处理动态和模拟实时动态PPP的RMS为分米级;北斗各类轨道卫星与GPS组合定位中,GPS+IGSO+MEO组合定位结果收敛速度最快,收敛时间为26.30min。

Performance analysis of BDS different orbits satellites for PPP

In order to make better use of BeiDou navigation satellite system(BDS)which was developed independently by China,this paper conducted the precise point positioning(PPP)experiments and analyzed the impact on positioning integrating with BDS different orbits satellites.Three positioning modes of static,post.kinematic and real.time were used in the experiment,and 12 days' observation data of 7 Multi.GNSS Experiment(MGEX)stations distributed over Asia.Pacific region was used.According to the experiments,IGSO satellites had the largest contribution to positioning results in the case of equal weights.IGSO+MEO had the best positioning accuracy among the combinations using two types of BDS satellites,static positioning RMS was 0.62,0.39 and 3.71 cm in E,N,U direction respectively,the RMS of post.kinematic and real.time modes reached decimeter level.Besides,GPS+ IGSO+ MEO had the fastest convergence speed in all combinations.Convergence time was only 26.30 min.