水平阵聚焦波束形成声图定位算法研究

为解决一些特定情况下需要的近场高精度定位问题提出了聚焦波束形成声图定位法.该方法根据测量区内不同位置对各阵元接收信号进行球面波补偿,获得目标声源的分布.根据声图来给出目标方位,距离进行定位.为了减少计算量,先测量目标方位,然后只对该方位附近小角度进行扫描.利用分频段综合的方法抑制由阵型引起的声干涉.经研究表明,该算法能够给出水下目标声源的二维声图并对近场目标进行高精度定位.

Measurement of underwater acoustic image positions using a horizontal linear array with focused beam-forming

A passive ranging method using focused beam-forming is proposed for near field,high accuracy ranging.According to the target's position in the measured field,the method applies spherical wave compensation to the received signal of every array unit to get the distribution of acoustic sources.To reduce calculation effort,the method first measures the bearing of the target using the middle array,then only scans the neighboring zone,a small angle around the target.Acoustic interference caused by the array pattern is inhibited by multi frequency band synthesis.This research suggests that the focused beam-forming method can produce two-dimensional acoustic images and high accuracy ranging for near field targets.