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推导有指向性脉冲声源在海底是分层结构的浅海中声场的积分表达式;分别仿真了爆炸声源和指向性脉冲源在浅海信道中传播的信号波形,其中假设了海底的沉积层和基底分别由水浸泡的砂和固态介质构成,砂底的参数数值用孔隙介质理论和实测相结合的方法进行选择;此外,在用砂和玻璃珠分别模拟砂层海底的水池内,观测了指向性脉冲源在不同接收点的信号的波形;结果表明:仿真波形的包络得到实验的印证。从而证明本文建立的指向性脉冲源在具有砂层海底的浅海中声场模型是可行的,可用于预报海洋环境参数对接收波形的影响,为水下通信、声呐信号设计与处理提供参考信息。
The integral expression of the sound field in the shallow sea where the directional pulse sound source is a layered structure is deduced. The signal waveforms propagating in the shallow sea channel of the explosive source and the directional pulse source are simulated respectively. The sedimentary layer and The substrate is composed of water-soaked sand and solid medium, and the parameters of the sand bottom are selected by combining the theory of pore media and the actual measurement. In addition, in the pool simulating the seabed of the sand layer with sand and glass beads respectively, The results show that the envelope of the simulation waveform is confirmed experimentally. It proves that the directional pulse source established in this paper is feasible in the shallow sea with sandy seabed, which can be used to predict the influence of the marine environmental parameters on the received waveform and provide reference information for underwater communications and sonar signal design and processing.