利用频域β-warping变换的浅海目标航向估计方法

Target course estimation based on frequencyβ-warping transform in shallow water

对于单一静止的观测平台,针对直航运动的目标,提出了一种利用频域β-warping变换的浅海目标航向估计方法.该方法利用频域β-warping变换从简正波互相关项中提取与目标距离呈线性关系的脉冲时延,进而估计距离特征量,并根据几何关系建立了目标航向、目标方位和距离特征量的数学模型,利用渐近无偏最小二乘方法对目标航向进行估计.数值仿真和实验数据处理结果表明:在浅海水平不变波导远场条件下,该方法可以对直航运动的目标进行可靠地航向估计,航向估计性能与观测时间内的平均方位变化率密切相关.

A course estimation method for the target with linear motion based on frequency-warping transform in shallow water is proposed using single stationary observer platform.In order to estimate the distance characteristic,this method extracts the time delay which is proportional to the target range from the modal coherence items using frequency-warping transform.Then this method establishes the mathematical model of the target course,the target bearing and the distance characteristic according to geometric relation,and estimates the target course using the asymptotically unbiased least squares method.The numerical simulation and the sea trial results show that,in a range-independent shallow water waveguide,this method can estimate the course stably for the target with linear motion,and the average bearing rate in observation time is closely related to the performance of this method.