矢量水听器拖曳阵的信号模拟器设计

A design of vector-hydrophone towed array simulator

本文中所设计的基于矢量水听器的拖线阵声纳模拟器,仿真了拖线阵的拖船干扰时域信号和空间传播特性,以及矢量水听器偶极子指向性。对于拖船干扰的仿真用Ecs模型来设定宽带功率谱,以AR模型来拟合指定功率谱,利用海底、海面对声场的一次反射作用仿真了拖船干扰的空间多途信道。利用插值滤波器的方法按照设定的时间精度仿真了宽带信号的阵元间精确延时。处理该模拟器所产生阵元时空采样仿真信号而得到的波束形成结果验证了该模拟器的有效性。

This paper demonstrates a sonar simulator of signals from towed line array based on vector hydrophone which simulates the tow ship radiated noise in time domain and its space propagation characteristics, in addition to the vector hydrophone dipole directivity. From the simulation of the towed ship noise, we use Ecs model to set the power spectrum shape of the wideband signal, use AR model to simulate the power spectrum, compute the image mirror of the first reflection from the sea surface and bottom to simulate the multipath channel .Besides, the simulator uses the interpolation filter to simulate the precise time delay of the wideband signal between the array elements. The result of the beamforming which processing the array digital signal generated by the simulator verifies the efficiency of the simulator.