GPS/BDS组合系统伪距单点定位模型精度分析  

Accuracy analysis on combined GPS/BDS pseudorange single point positioning

作　　者：邹波[1] 李晓莉[1] 陶庭叶[1] 高飞[1] 

机构地区：[1]合肥工业大学测绘工程系,合肥230009

出　　处：《测绘科学》2014年第10期30-32,52,共4页Science of Surveying and Mapping

基　　金：精密工业与工程测量国家测绘地理信息局重点开放基金项目(PF2012-2);中央高校基本科研业务专项资金项目(2013HGQC0001)

摘　　要：合理确定观测值权阵对于应用GPS/BDS组合系统提高单点定位的精度和稳定性十分重要。文章对GPS/BDS常用的几种定权模型等权模型、高度角随机模型、基于Helmert验后方差估计模型、顾及PDOP值的定权模型等进行了实验与分析。结果表明:基于Helmert的定权方法精度最高,进一步对其观测值的分类根据高度角进行改进并利用PDOP值的选星思想后,模型精度再次提高。研究结果可以为提高GPS/BDS组合系统伪距单点定位的精度提供参考。The reasonable determination of observation weights is important for using combined GPS/BDS to improve the accuracy and stability of single point positioning.In this paper,the commonly used GPS/BDS weighting models,including unit weight model,elevation-angle stochastic model,Helmertbased variance components estimation model and PDOP-based weighting model were tested and analyzed.The results showed that the accuracy of determination of weight matrix based on Helmert was the best,and the accuracy could be further improved through the classification of observed data based on elevation angle and the satellite selection based on PDOP value.

关 键 词：GPS/BDS 单点定位 HELMERT方差分量估计 高度角 空间位置精度因子 

分 类 号：P228.4[天文地球—大地测量学与测量工程]