扰动声线声压敏感核用于浅水前向散射小目标定位

针对收发合置声呐在浅水信道中对小目标的定位能力受强混响制约的问题,开展了利用目标前向散射的声屏障实验研究,通过计算扰动声线的声压敏感核实现了在自然环境中、非等声速条件下的小目标定位。扰动声线的声压敏感核反映的是因目标进入探测区域而扰动到的声线所包含的目标位置信息.首先,从众多本征声线中确定可以用于目标定位的扰动声线;然后,利用扰动声线的声压敏感核的空间特性实现定位。将该定位算法用于湖试数据,实现了利用20~28 kHz的线性调频信号对直径0.4 m目标球的定位。并且通过比较不同参数假设下的计算结果,发现该定位算法对于目标材质和尺寸的失配均具有较好的鲁棒性. 

Small target localization in shallow water based on forward scattering using the pressure sensitivity kernel for perturbed eigenrays

Because of the strong reverberation in shallow water waveguide,the localization performance of small targets degrades when using the monostatic sonar.To solve the above problem,an acoustic barrier experiment using forward scattering has been made on the lake.This work localizes small targets under non-isovelocity condition in natural environment,by utilizing the location information contained in the sensitivity kernel for the perturbed eigenrays in two steps,choosing effective perturbed eigenrays from numerous candidates and then localizing the targets according to the spatial distribution of sensitivity kernels.The results suggest that this method is able to locate a 0.4-m-diameter sphere by using the LFM signal in the 20-28 kHz frequency band.Moreover,this method demonstrates good robustness to target material and size mismatch.