A Method for Underwater Weak and Small Target Detection

Abstract

The invention provides a method for detecting underwater weak and small targets, which relates to the field of signal processing, uses the feature layer information fusion method to map the feature quantity into the same high-dimensional space, realizes classification, and detects through the classification results. The invention uses chaos theory Accurately describe and realize the feature extraction of the target signal and nonlinear components in the environmental noise, effectively avoid the interference of random components in the environmental noise, use the chaotic features in the signal for signal detection, which can significantly reduce the minimum detection signal-to-noise ratio and improve the detection probability. The random resonance method converts random noise energy into signal energy, improves the detection ability of weak targets, and can also highlight the nonlinear components contained in the signal. The classification method of the fusion center can eliminate false alarms and missed detections in a single node. etc. are separated from the correct detection results to further increase the detection probability and improve the effectiveness and reliability of weak and small target detection at sea.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a target detection method. Background technique [0002] The radiation noise level of underwater vehicles is small when they are sailing, and they are small targets. The radiation noise level of modern submarines is lower than the third-level sea state noise level when they are sailing underwater. The development of detection technology for weak and small targets at sea is slow and difficult to meet actual needs. [0003] The detection of long-distance targets in water is realized by extracting the features in the target radiation noise. The target radiation noise spectrum has a special line spectrum and continuous spectrum. The target detection can be realized by extracting the features. The line spectrum is one of the target radiation noise spectrum. Some important features have been achieved in the related research of using line spectrum to detect ship radiation noise. Li Qi...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technology, aiming at the problem of difficult detection of weak and small targets in water under the condition of low signal-to-noise ratio, combined with the needs of nonlinear feature representation in complex ocean environments, the present invention provides a weak underwater target with a lower signal-to-noise ratio. Object Detection Method

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