BDS RTK定位性能分析

目前，我国北斗三号基本系统已经建成并向全球提供公开服务，随着北斗卫星导航系统服务范围的扩大，北斗定位技术的应用正在逐渐增加，因此北斗的定位性能显得尤为重要。采用扩展卡尔曼滤波（EKF）和MLAMBDA算法基于天津地区实测数据，从卫星可见性、PDOP值、定位误差等方面对BDS及GPS、BDS/GPS的RTK定位性能进行较全面的对比分析。试验结果表明:?静态基线下，BDS RTK平面定位精度约为3.25cm，垂直定位精度约为5.98cm；?动态基线下，速度对定位精度有一定影响，BDS RTK最差定位精度不超过9cm。说明BDS在不依赖于其他卫星系统的情况下定位精度可达厘米级，足以满足日常测绘定位需求。以上研究内容为BDS用户提供了相关参考信息。 

Performance Analysis of BDS RTK

At present, the BDS-3 system has been built and provides open services for users worldwide. With the expansion of BDS service scope, the application of BDS positioning technology is gradually increasing, so the positioning performance of BDS is particularly important. Based on the measured data in Tianjin, the Extended Kalman Filter (EKF) and MLAMBDA algorithm are used to compare the RTK positioning performance of BDS, GPS and BDS/GPS from satellite visibility, PDOP and positioning error. According to the experiment:?Under the static baseline, the plane positioning accuracy of BDS RTK is about 3.25cm, and the vertical accuracy is about 5.98cm. ?Under the dynamic baseline, the worst positioning accuracy of BDS RTK is less than 9cm.It shows that the positioning accuracy of BDS can reach centimeter level without relying on other satellite systems, which is enough to meet the needs of daily mapping and positioning. The above research provides relevant reference information for BDS users.