为了实现潜艇在水下对直升机的反潜,将直升机噪声信号做为目标声源,用有限元的方法建立直升机噪声信号在空气和海水中的传播模型。通过仿真分析得到直升机噪声信号所形成的球面波辐射范围较大,横向传播距离与声源距离海面的高度成正比;球面波在水空界面传播时,其透射的总能量大约消耗为30dB,大部分能量透射进海水;透射进海水的声波可传播至浅海海底。所以直升机噪声信号可以作为潜艇在水中探测识别直升机的信号。

In order to realize the anti-submarine of the submarine to the helicopter underwater, the helicopter noise signal is used as the target sound source, and the propagation model of the helicopter noise signal in the air and seawater is established by the finite element method. Through the simulation analysis, the spherical wave radiation range formed by the helicopter noise signal is large, and the lateral propagation distance is proportional to the height of the sea surface from the sound source. When the spherical wave propagates through the water-space interface, the total energy transmitted is approximately 30 dB. Most of the energy is transmitted into the seawater and sound waves transmitting into the seawater can spread to the shallow seabed. Therefore, the helicopter noise signal can be used by the submarine' s signal in the water to detect and identify the helicopter.