Single-base active sonar low-calculation three-dimensional positioning method for deep sea environment

Abstract

The invention relates to a single-base active sonar low-calculation three-dimensional positioning method for a deep sea environment. A single-base active sonar composed of a single transmitting transducer and a multi-element receiving array is arranged below a critical depth; a target is irradiated by using a reliable acoustic path, and an echo arrival time delay of the underwater target or interference, a horizontal orientation-absolute distance two-dimensional graph and interference fringes are obtained by utilizing horizontal wave beam output of the multi-element array; in a mode of performing one-dimensional search on multiple offline calculated horizontal distance-depth fuzzy curves by utilizing the echo time delay and performing fringe frequency one-dimensional matching along horizontal distance-depth fuzzy dotted lines, a horizontal distance and depth information of bright spots are obtained; the underwater target and the water surface interference are judged by utilizing the depth; and the underwater target is screened out, and a three-dimensional positioning result is given, namely, a horizontal angle, a horizontal distance and depth information of the underwater target are given. By utilizing the method for performing active positioning by utilizing the single-base sonar in the deep sea environment provided by the invention, the underwater target can be subjected to three-dimensional positioning by using a relatively small calculation amount.

Description

technical field [0001] The invention belongs to the field of array signal processing, in particular to a three-dimensional positioning method for single-base active sonar with low calculation amount in deep sea environment Background technique [0002] In the deep sea environment, there is an acoustic propagation channel between the sea surface and the seabed, which is called a reliable acoustic path (RAP: reliable acoustic path). The condition for RAP to appear is that the transducer is located below the critical depth of the deep sea. At this time, a stable and reliable acoustic propagation path will be formed from the sea surface to the transducer, which is called a reliable acoustic path (Rui D, Kun-De Y, Yuan- Liang M, et al. A reliable acoustic path: Physical properties and a sourcelocalization method [J]. Chinese Physics B, 2012, 21(12): 124301.). [0003] Due to the advantages of RAP's stable propagation and low noise at critical depths, researchers proposed to use ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: for the disadvantage of using a reliable acoustic path to perform horizontal distance-depth two-dimensional scanning / matching which results in a large amount of computation, the present invention proposes a low-computation method using single-base active sonar in a deep-sea environment. 3D positioning method

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