一种基于双站协同的时差频差定位方法

A method of the time and frequency difference location based on duel-station cooperation

在无源定位系统探测地球地面或海面目标时,考虑到目标在地球椭球面上,不能忽视地球曲率带来的影响。采用地球椭球模型,基于双空中观测站协同的时差频差无源定位方法,首先建立大地直角坐标系,然后利用双站接收目标的到达时差和到达频差信息,运用构建矩阵的方法解算一元四次方程,得出目标的大地直角位置坐标,并研究了双站的几何精度因子。相比四站时差定位算法,所提算法有更高的应用价值,为对远距离地面或海面目标无源探测提供了一种新的技术思路。

When the passive location system detects the earth’s surface or sea surface target,it takes into account that the target is on the earth’s ellipsoid and the influence of the earth’s curvature cannot be ignored.In this paper,firstly,the earth ellipsoid model is adopted to establish the geodetic rectangular coordinate system based on the time difference and frequency difference passive localization method of the cooperation of two aerial observation stations.Secondly,using the information of arrival time difference and frequency difference of the target received by the two stations,the quartic equation of one variable is solved by the method of matrix constructing and the geodetic rectangular coordinates of the target are obtained,and the geometric accuracy factor of the two stations is studied.Compared with the four-station time difference localization algorithm,the proposed algorithm has a higher application value and provides a new technical idea for passive detection of long-range ground or sea targets.