多途条件下聚焦波束近程定位

讨论了直线阵通过聚焦波束形成技术对近程点目标的高精度定位问题并通过仿真验证,对多途的影响及海面起伏的影响也作了初步分析。通过波束引导减少了扫描的运算量,并且通过虚阵、时间反转镜和乘积声图的方法提高了聚焦点"亮度"和声图质量。仿真结果表明,虚阵和时间反转镜技术可以较好地抑制多途干涉,使用乘积声图可以使观察到的信号变得更清晰。在信噪比为0dB时可以很好地检测到目标。

Focusing beamform location in multipath channel

This paper discusses the high precision locating problem of dot target in near field by using the technique of focusing beam forming with linear array. The effect of multi-path and fluctuates of sea surface are analyzed. By the beam leading the computations for scanning is reduced,and by using the methods of virtual array,time reverse mirror and product of sound-map,the "brightness" of focusing and the quality of sound-map are improved. The result of simulating tests show that the methods of vir-tual array and time reverse mirror can restrain the interference brought by multi-path,and that the app-lication of the product of sound-map makes the target dot clearer. The target can be easily detected when the SNR is as low as 0db.