The theory of reverberation frequency-time interference patterns in deep water

Abstract Ocean reverberation is the main interference of active sonar, and how to suppress the detection of reverberation interference by active sonar or invert ocean environmental information through reverberation signals is an important research direction in underwater acoustic related neighborhoods. This article studies the frequency-domain interference structure of deep-sea reverberation signals based on ray theory. Research has shown that there is a frequency domain interference structure similar to shallow sea reverberation in the transmission and reception of reverberation signals near the deep sea surface, with a reverberation invariant value of approximately 1. This interference structure is generated by the superposition of four paths of sound rays: direct direct, sea surface reflection direct, direct sea surface reflection, and sea surface reflection sea surface reflection, and is greatly affected by the depth of transmission and reception. This study validates the possibility of using frequency-domain interferometric structures that utilize reverberation signals in deep-sea environments for reverberation suppression and target detection.