北斗三星无源导航定位技术研究

简述北斗三星无源导航定位的原理及定位误差源。探讨用最优估计理论和方法,即卡尔曼滤波技术,消除北斗三星无源定位数据中随机误差的方法。对华南沿海北斗三星无源定位实验数据进行滤波处理,结果表明:(1)北斗三星无源定位单点定位精度在纬度方向为±58m,经度方向为±4.3m,经卡尔曼滤波后其单点定位精度在纬度方向为±43m,经度方向为±3.6m;(2)北斗三星定位误差主要分布在纬度方向;(3)通过卡尔曼滤波可使北斗三星无源定位精度提高25%。

The Research on BeiDou Satellites Passive Navigation and Positioning Technique

The principle and positioning errors source of BeiDou satellites passive navigation are briefly introduced in this paper.The method which uses Kalman filtering technique to eliminate the random errors of BeiDou satellites passive positioning data is discussed.By filtering the experiment data of BeiDou three stars differential positioning on the South China Sea,the research indicates that,firstly,the point positioning precision of BeiDou three stars passive positioning system is ±58m in latitude direction and ±4.3m in longitude.Through the Kalman filtering,the precision is ±43m in latitude and ±3.6m in longitude.Secondly,the errors mostly distribute in latitude.Thirdly,if the survey data is filtered,the precision will be improved by 25 percent.