北斗卫星导航系统定位精度分析评估

The Analysis and Evaluation of BDS Positioning Accuracy

利用北斗导航型接收机在北京地区对系统性能进行长期监测,对B3I单频、B1I单频、B3I广域差分及B1I广域差分4种模式的定位性能进行统计评估。结果表明,北斗卫星导航系统区域服务一年来,运行情况良好;在北京地区,可用卫星数最少为8颗,按照95%置信度统计,位置精度衰减因子值绝大部分天数优于3,单频水平定位精度优于7m,高程定位精度优于10m。

This paper provides a long-term monitoring of the system performance through BeiDou navigation receivers in Beijing area,and statistically evaluates the positioning performance of four models：single frequency B3 Iand B1I,and wide area differential B3 Iand B1I.The results demonstrate that the regional system of BeiDou-2has worked properly during the one-year service;at a 95%confidence level,the number of available satellites in Beijing area is always more than 8,with PDOP value lower than 3,single frequency horizontal positioning accuracy better than 7mand elevation positioning accuracy better than 10 m.