Target detection method in deep sea incomplete sound channel

Abstract

The invention provides a target detection method in a deep sea incomplete sound channel, and relates to the technical field of submarine incomplete sound channel underwater acoustic detection, and themethod comprises the steps: obtaining the relation between the sound ray horizontal distance and depth under a specific sound velocity profile based on a ray simple positive wave, and enabling a marine environment to be an incomplete sound channel, i.e., the submarine sound velocity is smaller than the sea surface sound velocity; according to the determined relationship between the sound ray horizontal distance and the depth, obtaining a point of a sound ray minimum value position, and determining the position of a lower reversal point convergence area; selecting a plurality of hydrophones toform a multi-element vertical receiving array, arranging the multi-element vertical receiving array in a lower reversal point convergence area, and detecting a long-distance target to obtain a detection signal; and determining whether the detection target exists or not according to a detection signal obtained by detecting the long-distance target. According to the invention, large-depth arrayingis carried out in an incomplete sound channel by using the lower inversion point convergence region, so that the detection of a target is realized.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic detection of incomplete acoustic channels on the seabed, and relates to a target detection method in incomplete acoustic channels in the deep sea. Background technique [0002] The deep-sea convergence zone is of great significance to deep-sea long-range sound propagation, and many scholars have studied it. When the sound source is located near the sea surface, caustics and converging regions with high sound intensity will be formed near the sea surface. The so-called caustics refer to the envelope formed near the intersection point of sound rays, and the converging region refers to the high-intensity caustic region formed near the sea surface. [0003] At present, there is a reliable acoustic path for deploying hydrophones at large depths in the deep sea, but the reliable acoustic path requires the receiver to be placed below the critical depth, that is, under the condition of a comp...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the situation that the reliable sound path cannot be applied to the incomplete sound channel, the present invention proposes the application of the convergence area of ​​the lower inversion point to deploy hydrophones to detect targets at large depths in the deep sea. The present invention provides the following technical solutions:

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