船载柔性阵基元坐标实时获取技术研究

Element Coordinate Measurement of Ship-Based Flexible Hydrophone Array

为了解决船载柔性阵被动定位系统中基元位置不确定的问题,提出了实时获取柔性阵基元坐标的技术方案。利用辅助声源发射直接扩频的DPSK(Differential phase shift keying)信号,根据广义互相关法估计DPSK信号到达各基元的时延,进而计算各基元的位置坐标。利用水池试验和湖上试验对该方法进行了实验验证,用实时获取的阵元坐标计算得到的目标距离与GPS测量的结果相一致。理论与实验分析的结果表明,本文的方法能够准确地实时获取柔性阵基元的坐标信息。

A real-time array element coordinate measurement method is presented to reduce the ship-based flexible hydrophone array element position uncertainty in passive source localization systems. Auxiliary sources are used to emit direct spread spectrum DPSK pulse. Then, time delays between the acoustic emission source and these array elements are estimated by the gen- eralized cross-correlation method. Finally, the coordinate of these elements is calculated based on time delays. Data collected in the laboratory tank and on the lake are used to validate the method. The calculated target distances agree well with the GPS data by using the measured array element coordinate. Thus, both the theoretical and experimental results show that the method can real-time acquire the element coordinate.