Sonar target line spectrum enhancement method based on motion compensation

Abstract

The invention relates to a sonar target line spectrum enhancement method based on motion compensation, and the method comprises the steps: carrying out the compensation of a target power spectrum estimated by a passive sonar through employing the equal proportion relation of Doppler frequency offset, and improving the correlation of each snapshot power spectrum in integral time; and performing accumulation processing on each compensated time snapshot power spectrum, and performing feature extraction by using the accumulated power spectrum to obtain a line spectrum feature with a high signal-to-noise ratio. According to the method, a target power spectrum estimated by the passive sonar is compensated by using an equal proportion relation of Doppler frequency offset, the time correlation of the compensated power spectrum is greatly improved, and enhanced line spectrum features can be obtained by using a coherent processing method and a feature extraction technology. Compared with a conventional method, the method has the advantages that the high-signal-to-noise-ratio line spectrum features can be obtained, even the obvious line spectrum features can be obtained when the line spectrum cannot be extracted by the conventional method, the recognition accuracy is greatly improved, and the passive sonar target recognition performance can be improved.

Description

technical field [0001] The invention belongs to the field of acoustic signal processing target recognition, and mainly relates to a sonar target line spectrum enhancement method based on motion compensation. Background technique [0002] As the working distance of sonar detection equipment in our country continues to increase, the number of targets that can be found by sonar has risen linearly, most of which are interference targets, which makes it extremely difficult to identify real targets. It is necessary to improve the performance of target recognition technology to Coping with increasingly complex underwater acoustic environments. At present, passive sonar identification technology often uses target line spectrum features. The principle is that for man-made underwater acoustic targets (such as submersibles, ships, merchant ships, etc.), the radiation noise spectrum reflects the structure, power, working conditions, status, etc. of the target. Therefore, the line spect...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the performance degradation of underwater acoustic target line spectrum caused by Doppler frequency deviation, and provides a sonar target line spectrum enhancement method based on motion compensation, which can obtain high signal-to-noise ratio line spectrum features compared with conventional methods , which greatly improves the line spectrum detection ability, and can be applied to most of the current domestic passive sonar equipment

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