不同模式下BDS动态PPP精度分析  

BDS dynamic PPP accuracy analysis under different modes

作　　者：陈秀德 刘惠[2] 盛传贞[1] 应俊俊 惠沈盈 CHEN Xiude;LIU Hui;SHENG Chuanzhen;YING Junjun;HUI Shenying(State Key Laboratory of Satellite Navigation System and Equipment Technology,the 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050000,China;School of Computer Science and Technology,Xidian University,Xi’an 710000,China)

机构地区：[1]中国电子科技集团公司第五十四研究所卫星导航系统与装备技术国家重点实验室,石家庄050000 [2]西安电子科技大学计算机科学与技术学院,西安710000

出　　处：《导航定位学报》2023年第3期14-21,共8页Journal of Navigation and Positioning

基　　金：国家重点研发计划项目(2019YFC1511504);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);中国电子科技集团公司信息科学研究院发展基金项目(BAX20684X010)。

摘　　要：针对接收机可能存在解码差异,导致北斗卫星导航(区域)系统(BDS-2)与北斗三号全球卫星导航系统(BDS-3)间存在系统偏差(ISB)的问题,分析不同模式下北斗卫星导航系统(BDS)动态精密单点定位(PPP)精度:通过2种组合4种ISB处理场景下的BDS动态PPP实验,给出分析结果。结果表明,B1I/B3I信号可见卫星数和位置精度因子(PDOP)均最优,B1C/B2a和L1/L2信号可见卫星数和PDOP均相当;在无电离层组合模式下,大多数测站采用白噪声ISB估计更易加速收敛,与不估计ISB相比,在东(E)、北(N)、天(U)方向的收敛时间分别提升了-0.47%、3.18%和0.94%,收敛精度分别为1.90、1.70、5.44 cm;与无电离层组合模式相比,非差非组合受不同ISB估计的影响差异更大,因此,在使用非差非组合时,一定要选择合适的ISB估计策略;B1C/B2a组合在BDS-2服务范围外,表现出更好的动态PPP定位性能。Aiming at the problem that the decoding differences in receivers may lead to inter-system bias(ISB)between BeiDou navigation satellite(regional)system(BDS-2)and BeiDou-3 navigation satellite system(BDS-3),the paper analyzed the dynamic precise point positioning(PPP)accuracy of BeiDou navigation satellite system(BDS)in different modes:the BDS dynamic PPP experiments with two combined models and four ISB processing scenarios were carried out.Results showed that the number of visible satellites and the position dilution of precision(PDOP)of B1I/B3I signals would be both the best,and the number of visible satellites and the PDOP of B1C/B2a and L1/L2 signals would be similar;in the ionosphere-free(IF)combined mode,most of the stations using white noise ISB estimation could be easier to accelerate convergence,and compared with the non-estimation of ISB,the convergence time in the directions of E,N and U could be improved by-0.47%,3.18%and 0.94%,respectively,and the convergent precision 1.90,1.70 and 5.44 cm,respectively;compared with the IF combination mode,the undifference un-combination model would be more affected by different ISB estimates,therefore,when using the non-difference non-combination model,an appropriate ISB estimation strategy must be selected;moreover,B1C/B2a combination could have better dynamic PPP positioning performance outside the service range of BDS-2.

关 键 词：北斗卫星导航(区域)系统(BDS-2) 北斗三号全球卫星导航系统(BDS-3) 系统间偏差(ISB) 精密单点定位(PPP) 无电离层组合(IF) 非差非组合 

分 类 号：P228[天文地球—大地测量学与测量工程]