海深变化环境下目标距离测定

垂直阵接收到可以在时间上区分的引导声源信号和未知声源信号,通过对已知引导声源信号和未知声源信号进行相关比较,结合波导不变量β构建水平虚拟接收阵,可以对海底水平变化环境下目标声源进行距离测定。在宽带接收的情况下,只需要很少的环境信息就能对目标进行测距,与传统的匹配场处理相比,不需要复杂的声场建模和计算,而且降低了对环境参数信息的获取要求,体现了环境自适应信号处理。首先介绍虚拟接收的原理和方法,通过数值模拟和2004年实验数据分析,利用引导声源可对其它声源进行距离测定,误差在10%左右。

Object ranging under seabed varying environment

Both the guide source signal and the object signal received by a vertical array are time separable. By correlating the two signals to construct a horizontal virtual array and combining with the waveguide invariant β, the range of object under seabed varying environment can be determined. With the wideband receiving array, locating an object source only needs little environment information. Compared with traditional match field processing (MFP), the complicated com-putation of match field is not needful and the requirement of environment parameters is reduced. So it is consistent with the concept of adaptive signal processing. In this paper, the theory and method of virtual receiving array is discussed. Through simulations and analysis of experimental data, the good result in determining object range can be obtained with an error of about 10%.