中国空间科学技术

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数字地图辅助的双星无源定位精度分析

徐昂;樊士伟;张勇;   

  1. 北京跟踪与通信技术研究所;
  • 发布日期:2009-04-25

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

Xu Ang Fan Shiwei Zhang Yong (Beijing Tracking&Communication Technical Institute,Beijing 100094)   

  • Online:2009-04-25

被引次数

2

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。

关键词: 双星, 无源定位, 高程假设, 数字地图, 精度分析

Abstract: 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 1 km,digital map should be used tO improve accuracy.The positioning precision 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.

Key words: Dual-satellites, Passive location, Heigh assumption, Digital map, Accuracy, analysis