非合作线谱声源分布式定位方法

非合作目标定位是水声定位领域的研究热点。为充分挖掘并利用各类可观测参数，提高非合作目标定位能力，本文提出一种基于目标频率变化信息的非合作目标定位方法。该方法针对匀速直线运动目标的定位问题，首先根据多普勒频移原理，建立观测频率与目标辐射频率、目标运动速度、位置之间的函数映射关系，利用最小均方准则建立目标函数，通过优化算法估计分布式定位系统中各个测量单元与目标运动轨迹的致近点距离，最后综合各观测节点的测距结果，构建几何定位模型，求得目标运动轨迹的解析解。本文通过仿真分析，证明了该方法的有效性，并指出了该方法需要目标通过与各测量单元的致近点才能获得较好的距离估计能力。文中分析了不同频率估计精度对定位精度的影响，结果表明，提出的定位方法对测频精度具有一定的容限，是一种高精度的非合作线谱声源定位方法。

Distributed localization method of non cooperative line spectrum sound source

Non cooperative target localization is a research hotspot in the field of underwater acoustic localization. In order to make full use of all kinds of observable parameters, improve the ability to locate non-cooperative targets, this paper proposes a non cooperative target localization method based on the frequency information. This method is aimed at the localization problem of uniform linear moving target. Firstly, we establish the mapping relationship of the observation frequency and the target radiation frequency, moving speed, initial coordinates according to the Doppler frequency shift principle. The objective function is established based on minimum mean square criterion. Then we estimate the approach point distance between each observation node and the target track by the optimization algorithm. Finally, integrating the ranging results of each observation node, build geometric positioning model, the analytical solution of the target motion trajectory is obtained. This paper proves the effectiveness of the method through simulation analysis, and points out that this method needs the target to pass through the approach point of each observation node to obtain better distance estimation ability. The influence of different frequency estimation accuracy on positioning accuracy is analyzed, the simulation results show that the positioning method proposed in this paper has a certain tolerance to the frequency measurement errors, and it is a high-precision non cooperative line spectrum sound source localization method.