利用海底反射时延结构的深海海底反射区目标距离深度估计方法

A range and depth estimation method using the time delay structure of bottom reflection in deep sea bottom bounce area

针对收发深度关系未知时利用时延差进行距离深度估计可能会出现伪源的问题,提出了一种利用4个时延差直接进行距离深度估计的方法。该方法通过分析4条多径间4个时延差的关系,利用伪源与真实位置间同种时延差的差异,构造模糊平面进行定位,无需判断收发深度关系即可排除伪源,且在单水听器上即可实现。仿真实验与误差分析验证了该方法的有效性,海试结果表明,该方法在两个不同深度的单水听器上均成功实现了对11.0~16.5 km目标的距离深度估计,距离和深度的均方根误差分别小于1.1 km和54 m。

When the depth relationship between source and receiver is unknown,using the time delay differences for distance and depth estimation may result in a pseudo source.To address the issue,a method for directly estimating distance and depth using four time delay differences has been proposed.This method analyzes the relationship of four time delay differences between four multipath,by utilizing the difference in the same time delay difference between the pseudo source and the true position,a fuzzy plane is constructed for localization.The pseudo source can be eliminated without determining the depth relationship between the source and receiver,which can be achieved on a single hydrophone.The effectiveness of the method is verified through simulation experiments and error analysis.The sea experiment shows that the method successfully achieves distance and depth estimation of targets ranging from 11.0−16.5 km on two single hydrophones at different depths,with root mean square errors of less than 1.1 km and 54 m,respectively.