Single ring array active three-dimensional positioning method applied in deep sea environment

Abstract

The invention relates to a single ring array active three-dimensional positioning method applied in a deep sea environment. A single-base active sonar formed by a single transmitting transducer and amultiple ring array is arranged below the critical depth; a target is irradiated by means of a reliable acoustic path, and the echo arrival delay, a horizontal orientation-absolute distance two-dimensional graph and an interference fringe pattern of an underwater target or interference are obtained by means of a ring array horizontal beam output; information including the horizontal distance and the depth of a bright point is obtained by means of a horizontal distance-depth two-dimensional matching mode; and the underwater target and the water surface interference are judged by means of the depth, the underwater target is finally screened out, and a three-dimensional positioning result is provided, that is to say, information including the horizontal angle, the horizontal distance and thedepth of the underwater target is provided.

Description

technical field [0001] The invention belongs to the field of array signal processing, in particular to an active three-dimensional positioning method for a single circular ring array in a deep sea environment. Background technique [0002] In deep sea environment, reliable acoustic path (RAP: reliable acoustic path) is an effective acoustic propagation channel. 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.Areliable acoustic path: Physical properties and a source localization 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 RAP to locate targets. At present, research hotspots mainly focus on placing...

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Problems solved by technology

However, in many cases, the target radiation noise level is very low, and the method of passive detection using RAP faces the problem of weak received signal level, resulting in a decrease in detection performance

This problem can be overcome to some extent by using large-aperture arrays and long-time accumulation processing, but this brings system cost and signal processing difficulties

In addition, when using RAP passive detection, it mainly focuses on low-frequency band processing, and the angle resolution and time resolution that can be obtained are limited, which easily leads to poor estimation of target parameters (arrival angle, arrival time delay, etc.), and affects the accuracy of the target. Effective positioning of

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