数字地图辅助的双星无源定位精度分析  

Analysis of Positioning Accuracy of Dual-Satellites Passive Location Algorithm Aided Digital Map

作　　者：徐昂[1] 樊士伟[1] 张勇[1] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《中国空间科学技术》2009年第2期53-58,共6页Chinese Space Science and Technology

摘　　要：针对采用WGS-84椭球模型的双星时差频差定位算法,对零高程假设下由于真实高程误差引起的系统误差进行了分析,得出当辐射源位于海拔lkm以上的高度时,需要引入数字地图的结论。然后引入数字地图辅助的算法,给出了仿真结果。结果表明,该方法可以大大减小由辐射源海拔高度引起的定位误差。最后分析了数字地图的高程精度对定位精度的影响。The positioning method based on WGS-84 ellipsoid model using dual-satellite TDOA/FDOA measurements was discussed, and the positioning error caused by target zero-height assumption was analyzed. The results show that if the target＇s height is more than lkm, digital map should be used to improve aceuracy. The positioning preeision using digital map was analyzed by many simulation results. The research shows that this method is reasonable. At last, the influence of digital map＇s height accuracy was analyzed.

关 键 词：双星 无源定位 高程假设 数字地图 精度分析 

分 类 号：P283.7[天文地球—地图制图学与地理信息工程] P228.4[天文地球—测绘科学与技术]