北斗系统静态点定位性能分析

Research on the Assessment of BDS Static point positioning

针对北斗导航卫星系统转入系统应用阶段以来,北斗导航卫星系统服务性能面临的长期监测评估问题,提出了评价系统性能的方法。利用全球连续监测评估系统乌鲁木齐、长春、临潼、郑州、昆明、广州等国内均匀分布跟踪站的静态点定位数据,通过对各站单历元定位精度、连续性、可用性、精度衰减因子进行分析,客观评价北斗导航卫星系统在国内各区域的服务性能。结果表明,北斗导航卫星系统综合定位精度优于10m,水平精度约为5.49m,垂直精度为7.35m;各地区精度衰减因子约为4.12,当精度衰减因子小于4.37时,其对提高定位精度的影响开始减弱;水平垂直精度同时优于10m的系统连续性、可用性约为88.89%、97.83%;系统存在中心地区性能较高,西部北部地区性能不稳定,区域分布等问题。

Since BDS（BeiDou navigation satellite system）got into the application stage,a long-term monitoring evaluation mission faced by the performance of BDS.This paper proposed the method of evaluating the service performance of the navigation system.By using the static point positioning data of six uniform distribution iGMAS（international GNSS Monitoring Assessment System）stations,Urumqi,Changchun,Lintong,Zhengzhou,Kunming and Guangzhou,to compare and analysis the accuracy,continuity,availability,PDOP of China＇s BDS single epoch positioning results of each areas,and evaluate the regional service performance objectively.The results shown that,the integrated positioning accuracy of BDS is better than10 m,the Horizontal precision is about 5.49 m,and the vertical accuracy is 7.35 m.The average of each area＇s PDOP is about4.12,when PDOP is smaller than 4.37,its influence on increasing positioning accuracy become decrease.The continuity,availability of Horizontal vertical accuracy better than 10 mat the same time is about 88.89%and 97.83%.In the end,the System has better performance in center areas,but an unstable one in the West and North areas.