利用GDOP对蜂窝移动通信系统移动台定位的方法

A Mobile Station Locating Method for a Cellular Communication System Based on GDOP

针对基于网络的到达时间 (TOA)定位系统 ,分析了定位误差与移动台 (MS)位置及参数测量误差的关系 ,结合实际中能同时接收到移动台信号的基站 (BS)数有限、定位误差对移动台位置敏感的特点 ,提出了直接用解析法计算所有位置线的交点 ,然后用几何淡化因子 (GDOP)及参数测量误差的均方差对交点进行加权平均来估计移动台位置的方法。该方法同时考虑了参数误差与几何淡化因子对定位精度的影响 ,不需要矩阵求逆 ,运算量小 ,速度快。适用于存在直达波 (LOS)信号的蜂窝通信环境。

In this paper, the relationship between the locating errors and the location and parameter measurement errors of the mobile station(MS) is presented. Considering the fact of the limited number of the base stations(BS) which receive the signal coming from the mobile station and the relationship between the locating errors and the location of the mobile station stating, a mobile station locating method is proposed for the network-based time of arrival(TOA) locating systems. The proposed method calculates all intersections of the circular lines of position(LOPs) by the analytical method, and then finds the location of the mobile station by the weighted average to all of the intersections with the geometric dilution of precision(GDOP) and the standard deviation of the parameter measurement. The method is characterized by light computational load and short time because it does not need to calculate the inverse of matrix. It works well in a line of sight(LOS) radiowave propagation environment. \;