阴影匹配虚拟观测值融合的GPS定位方法  

A GPS positioning method based on shadow matching and virtual observation fusion

作　　者：刘力坤 李博峰 LIU Likun;LI Bofeng(College of Surveying and Geo-Informatics,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学测绘与地理信息学院,上海200092

出　　处：《导航定位学报》2021年第6期1-8,共8页Journal of Navigation and Positioning

基　　金：转发式试验系统总体课题项目(Y9E0151M26);转发式试验系统(ZFS)课题项目(ZFS19001D-ZTYJ03)。

摘　　要：针对当前利用城市三维模型提供的卫星遮挡信息的阴影匹配法存在计算效率差、实时应用难及卫星数目变化较小时的匹配结果停滞等问题,提出一种实时阴影匹配及其最高分备选点集中最优位置提取的方法。通过将三维模型栅格化,无需预处理便可实现阴影匹配计算;并通过构建虚拟伪距,可在观测卫星数少于4颗的情况下实现定位。采用全球定位系统(GPS)单系统的实验结果表明,该方法定位整体均方根误差为2.83 m。该方法还提高了卫星观测数据的使用率,增强了单系统卫星定位在城市复杂环境下定位的可用性。In order to solve the problems of low computational efficiency,difficulty in real-time application and stagnation of shadow matching results when there are few satellites observed,in the current shadow matching method using the satellite occlusion information provided by the city’s 3D model,a method of real-time shadow matching and optimal location extraction of the highest candidate point set was proposed in this paper.By rasterizing the 3D model,shadow matching could be realized without preprocessing.By constructing virtual pseudorange,positioning could be realized when the number of observation satellites was less than 4.The experimental results of Global Positioning System(GPS)showed that the overall root mean square error of the method was 2.83 m.This method also improved the utilization rate of satellite observation data,and enhanced the availability of single system satellite positioning in complex urban environment.

关 键 词：阴影匹配 实时处理 可用性 

分 类 号：P228[天文地球—大地测量学与测量工程]