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我国各省CORS站建设逐步完善,以及我国BDS卫星导航系统在亚太区域提供服务,促进了BDS+GPS双模融合伪距差分定位的研究和发展。目前,在PC机上伪距差分定位早已实现,且算法也已经比较成熟,但在移动终端上进行BDS+GPS双模融合伪距差分定位向用户提供服务方面还比较薄弱,针对这一问题,本文提出了将网格伪距差分定位算法嵌入到手持机,并且实现了手持机实时网格伪距差分定位。本文阐述了方法原理并进行了车载试验分析,结果表明,在与TBC软件动态解算结果作为已知准确值的外符合精度方面,手持机BDS+GPS双模融合网格伪距差分定位结果的水平精度为0.522 1 m,在水平方向上可以达到亚米级定位精度。
The construction of CORS stations in all provinces of China has been gradually improved and the BDS satellite navigation system in our country has provided services in the Asia Pacific region, promoting the research and development of the differential localization of BDS + GPS dual-mode fusion pseudoranges. At present, the differential positioning of pseudorange on PC is already realized and the algorithm is relatively mature. However, in the mobile terminal, the differential positioning of BDS + GPS dual-mode pseudorange is still weak in providing services to users. In response to this problem, In this paper, we propose to embed the grid pseudorange differential positioning algorithm into the handset and to realize the real-time grid pseudorange differential positioning of the handset. This paper describes the principle of the method and carries out a vehicle test analysis. The results show that the accuracy of the hand-held BDS + GPS dual-mode fusion grid pseudo-range differential positioning results in terms of the dynamic accuracy of the TBC software as the known accuracy value, Horizontal accuracy of 0.522 1 m, in the horizontal direction can reach sub-level positioning accuracy.