聚焦波束形成声图近场被动定位技术仿真研究

介绍了一种近场高精度被动定位方法——聚焦波束形成声图定位。针对全方位扫描声图定位计算量大的问题,提出了先利用中阵测向再对测得方位附近小角度进行扫描的方法,可有效减少计算量;针对单一频段存在声干涉现象提出了分频段融合的方法,可有效抑制因阵形产生的声干涉,降低声图旁瓣;为了克服多途干涉对声图质量的影响,分别采用了虚拟时间反转镜和虚阵抗多途测量技术,均能很好地抑制多途。以水平线阵为模型的仿真结果表明,聚焦波束形成技术能够实现被动目标的近场高精度定位。

Research on Simulation of Near Field Passive Ranging with Underwater Acoustic Image by Focused Beam-forming

A passive ranging method,using focused beam-forming,has a good precision in near field. Pointing to the large calculation quantity,the target was first born by the middle array,and then the neighborhood of the direction was scanned,in this way the calculation quantity could reduce effectively. By dividing frequency band,the phenomenon of interference could be restrained which was produced by the model of array and reduce adjacency.The multi-path interference of underwater acoustic channel may affect the quality of measurement. Virtual time reversal mirror or virtual array can solve the problem very well. Simulation results show that the focused beam-forming technique can high precisely rang in near field.