基于辐射噪声强度和线谱多普勒的目标运动参数估计

Target motion parameters estimation based on radiated noise intensity and Doppler frequency shift of line spectrum

提出了一种利用辐射噪声强度和线谱多普勒频移联合估计匀速直线运动目标的速度和正横距离的方法。该方法基于单水听器观测,首先在球面波近似下利用目标辐射噪声强度估计出正横时刻并确定目标速度和正横距离之间满足的线性关系;然后利用线谱多普勒频移,通过对一个新定义的代价函数进行一维搜索的方法估计出目标速度和正横距离。与现有各种基于噪声强度和线谱多普勒频移进行测距测速的方法相比,该方法具有以下优点:(1)要求更少的先验知识,易于确定参数搜索范围;(2)参数估计过程中仅需一维搜索,并且算法可应用于需对目标参数进行预报的场合。数值仿真给出了不同参数条件下目标运动参数估计结果的统计误差。湖试结果验证了该方法的有效性。

A method of applying radiated noise intensity and Doppler frequency shift of line spectrum to estimate the motion parameters of a constant velocity target is presented in this paper.These parameters consist of the velocity and the perpendicular distance between the receiver and the motion track（PD-RMT）,and this method is based on a single omni-directional sensor.First,the moment at the closest point of approach（CPA） and the linear relation between the PD-RMT and the velocity are obtained from the noise intensity in spherical wave approximation.Then the PD-RMT and velocity of the target can be obtained in one-dimension search by defining a new 1-D cost function based on the Doppler frequency shift of line spectrum.The main advantages of this method [comparing with the former results] are as follows：（1） It is convenient to determine the searching bounds of unknown parameters with less prior knowledge;（2） It is more efficient for only one-dimensional search is needed and this method can be also used to estimate the motion parameters before the target arrives at CPA.Numerical simulations are made to show the statistical errors of the parameters estimation in different cases,and the effectiveness of the proposed method is verified by experiment results.