BDS/GPS网络差分定位试验分析

针对在传统网络差分定位中,单GPS系统在观测条件不好情况下会出现可用卫星数量偏少甚至不够、观测值存在粗差而影响定位等问题,该文提出BDS/GPS双系统组合网络伪距差分定位的数学模型,并加入基于最小二乘残差法探测粗差观测数据的质量控制算法。基于省CORS网实时BDS/GPS双系统数据,以国产的手持机终端作为流动端,利用BDS/GPS伪距差分平台进行了车载动态试验,根据试验对比和分析,动态定位平面精度优于1m,在加入质量控制算法模式下,定位精度和可靠性都有一定提高。

Analysis of BDS/GPS network differential positioning

Aiming at the problem that the number of available satellites are relatively few,even not enough and presence of gross errors with single GPS system under poor observing conditions in the traditional network differential positioning,which will affect the positioning,the BDS/GPS network pseudorange differential positioning mathematical models and quality control algorithms(by least squares residuals method to detect gross errors)were proposed in this paper.Based on provincial CORS network real-time BDS/GPS dual-system data,with the domestic handset BDS receiver as a mobile terminal,vehicle dynam ic tests were conducted using BDS/GPS pseudorange differential platform.The results indicated that the positioning accuracy in dynamic mode was better than 1 meter(vertical)and the accuracy and reliability of positioning was therefore some improved when compared with the existing quality control algorithm model.