The NLOS sound signal usually arrives at acousticarray by diffraction, and the diffracted transmission path is a geodesic according to the extensive Famat's principle.
非视距声信号通常经过绕射到达基阵，根据广义费马原理，传播路径为一条短程线。
2
Because the system has the characteristics of the high integration, excellent portability and expansibility, it is applied to the underwater acousticarray signal acquisition and processing.
该系统集成度高，具有良好的便携性和可扩展性，在水声基阵信号采集与分析中广泛应用。
3
We investigate the method to create the noise field of the underwater by using numerical simulation. The method has been applied to designing the optimal array gain of underwater acousticarray.