收发深度变化对浅海混响的影响研究

Study on the Effects of Change of Sound Source and Receiver Depth on Reverberation in Shallow Water

海洋中,由于种种原因可能造成声呐发射深度或接收深度发生变化,针对这一问题,研究了水听器的晃动给混响强度带来的影响。在波束位移射线简正波理论的基础上推导了浅海混响模型,仿真比较了负跃层浅海情况发射深度或接收深度上下变化1m时(小幅度变化)的混响衰减曲线,结果表明发射深度或接收深度上下变化1m时对混响衰减曲线的影响不大。可以认为水听器小幅度晃动时浅海混响相对于声源深度及接收深度是稳定的。

In the ocean sound source depth or receiver depth of sonar may be changed for various reasons. So reverberation intensity will be changed by vibration of hydrophone. To cope with this problem, reverberation model in shallow water is discussed based on beam-displacement ray-mode theory. For example, the model is applied in shallow water with a thermocline and curves of reverberation loss calculated by the modal are compared when sound source depth or receiver depth changes 1 meter upwards and downwards. Results of simulation show that the curves have no differences. So reverberation in shallow water is steady with regard to sound source depth or receiver depth.