基于TOA和TDOA的三维无源目标定位方法

Passive 3D target location method based on TOA and TDOA

提出了一种基于到达时间(time of arrival,TOA)和到达时间差(time difference of arrival,TDOA)的空中运动平台对目标高精度三维定位的无源定位方法。该方法使用3个辅站信号到空中运动平台的TOA以及辅站位置确定空中运动平台自身的位置,然后依据目标散射回波到达各个辅站与空中运动平台的TDOA确定目标的位置。分析了三维TDOA目标定位模糊产生的原因,提出了一种无模糊的高精度TDOA目标位置求解算法。仿真结果表明,该算法比经典的TDOA定位算法精度高,而且不存在定位模糊,从而验证了该空中运动平台对目标进行无源定位方法的有效性以及正确性。

The target location could not be estimated in an aerial moving platform with a conventional passive location system.Based on time of arrival（TOA）and time difference of arrival（TDOA）,a novel 3D target positioning scheme is provided,in which the position of an aerial moving platform can be located by u-sing TOA information of three signals and geographic locations from three auxiliary stations and the target position can be located with the help of TDOAs from the target scattering echoes recorded by the aerial mov-ing platform and three auxiliary stations.The reason why there is location ambiguity in the 3D TDOA loca-tion method is uncovered,and a high precision TDOA target positioning algorithm without location ambigui-ty is proposed.Compared with the classic TDOA location algorithm,the proposed algorithm can not only improve the location accuracy,but also eliminate the location ambiguity.The effectiveness and correctness of the passive 3D target location method of the aerial moving platform are validated by favorable performance of the simulation results.