数字地图辅助的三星时差定位方法及误差分析

Location Method and Error Analysis for Three-Star Time-Difference System Using Digital Map

针对应用三星组成卫星簇对地面辐射源定位的问题,提出了利用数字地图辅助以及使用WGS-84坐标系作为精确定位的模型,在此基础上提出了对地面辐射源目标进行定位的迭代格式的定位算法,并且利用模拟三维地形图进行了定位结果仿真;推导了定位方法的理论误差表达式,研究表明定位仿真结果与误差理论分析一致,并可降低由目标高程假设带来的定位误差。

Aiming at three stars used to locate the ground radiant point, a precise location model using digital map and WGS-84 coordinate is presented, and an iterative location algorithm for ground target is therefore proposed. The location simulation is made by using simulated three-dimensional relief map, and the theoretical error expression for the location method is deduced, The presented result shows the location simulation is consistent with the error theoretical analysis, and the location error caused by height hypothesis can be effectively decreased.