基于加权矩阵的TDOA多站无源定位算法

Method of TDOA multi-station passive location based on weighted matrix

无源定位技术有着广阔的应用前景,传统的多站无源定位通常使用泰勒展开法对目标进行定位求解,在此基础上一种基于加权矩阵的多站到达时间差测量法被提出.当被测目标发射信号中存在稳定载波情况下,以各站点的载波跟踪环路为切入点,分析了采用常规时域相关法对载波跟踪时的环路噪声特性方程,利用此方程对多个观测站间的距离差观测量加权矩阵进行建模,再利用此加权矩阵对定位方程进行改进,最终得到高精度的目标位置解.通过仿真实验可以证明:在同等条件下该方法比传统泰勒展开法的定位精度有所提高,最好可提高精度约30%.该方法是一种适用于多站无源定位的有效方法,尤其适用于移动观测站点情况.

Passive location technology has been applied broadly these years.Taylor expansion method was commonly used by the traditional multi-station passive location system.A new method of time difference of arrival（TDOA） passive location with multi-station based on weighted matrix was presented.When the stable carrier being included in a target＇s emission signal,the noise characteristics equations was analyzed using the conventional time-domain correlation method after the carrier was tracked.The model was constructed with the weighted matrix of the distance difference observations among a number of stations,thus the high accuracy location being obtained by employing the weighted matrix.From the simulation,it can be proved that under the same condition,the position results using presented method are more accurate than the traditional Taylor expansion method,improved by about 30% in best cases.This method is an effective method for multi-station passive location,particularly for mobile observation stations.