基于阵不变量的浅海水声目标定位技术

Underwater Target Localization Based on Array Invariant in Shallow Water

提出了一种基于阵不变量理论的浅海目标定位方法。在简正波理论下,推导了阵列接收信号常规波束形成波束输出与单阵元测量声压的互相关声强包络峰值关于模态传播时延和方位的分布结构。分析表明,该结构包含了目标方位和距离信息;在波束-时域声强图中,利用Radon变换提取包络峰值的分布结构,进而可以估计目标的方位和距离。仿真研究结果表明,利用该方法能够有效地对目标实现测向和测距,具有较高精度。

An underwater target localization mathed based on array invariant in shallow water is proposed. Based on normal modes theory, the cross correlation intensity of the receiving array＇s conventional beam- forming output and the pressure signal of one element is derived. And the distribution of the cross correla- tion intensity envelop as the function of modes＇ travel time delay and array scan angle is analyzed. It is indi- cated that this distribution contains the information of target＇s bearing and range. Taking the use of Radon transform, the distribution in beam-time image can be extracted to estimate the bearing and range. The simulation results demonstrate that the target bearing and range can be estimated effectively with this method, which is highly accurate.