基于双站协同的目标时差定位算法

A Target Location Algorithm Using Time DifferenceBased on Two-Station Coordination

无源定位系统在探测远距离目标时,容易受到地球曲率的影响,在对多个观测站坐标系进行统一的过程还会引入额外误差,造成系统对目标的估计位置与真实位置存在较大偏差,进而给后续的数据关联、信息融合等造成严重的影响。鉴于此,提出了一种考虑地球曲率、基于双站协同的时差无源定位算法。首先将所有的地理坐标转换至大地直角坐标系下,然后利用双站接收目标的到达时差信息,基于地球椭圆方程和泰勒级数展开的方法解算出目标的大地直角位置坐标。理论分析与仿真实验表明,所提算法能克服地球曲率的影响,实现定位系统的坐标系标准化,且有效地降低了定位误差,为对远距离目标无源探测提供了一种新的技术思路。

Passive location systems are susceptible to the Earth's curvature when detecting long-range targets,and the process of unifying the coordinate systems of multiple observation stations introduces additional errors into the system,resulting in large deviations between the target position estimated by the system and the real target position,which in turn causes serious consequences on the subsequent data correlation and information fusion.In view of this,this paper proposes a passive location algorithm using Time Difference of Arrival(TDOA),which is based on two-station coordination considering the Earth's curvature.Firstly,all geographical coordinates are converted to geodetic Cartesian coordinate system.Then,the information of TDOA of the target is received by the two stations.Finally,the geodetic Cartesian coordinates of the target position are solved based on the elliptic equation of the Earth and the method of Taylor series expansion.Theoretical analysis and simulation experiments show that the proposed algorithm can overcome the influence of the Earth's curvature,realize the standardization of the coordinate systems of the location system,and effectively reduce the location error,which provides a new technical idea for the passive detection of long-range targets.