Automatic detection and judgment method for vector hydrophone line spectrum

Abstract

The invention discloses an automatic detection and judgment method of a vector hydrophone line spectrum. The method includes: dividing a detected target signal received by a vector hydrophone into multiple frames of vector data, and solving the average sound intensity spectrum of each frame of vector data; extracting a line spectrum of the vector data frame according to the average sound intensityspectrum; comparing the line spectrum frequency of the current vector data frame with the line spectrum frequency of the previous vector data frame, and classifying the vector data frames meeting theDoppler tolerance into the same line spectrum; and calculating amplitude mean values and azimuth mean values of different frames of the same line spectrum, and if the amplitude mean values change inthe forward direction and the azimuth mean values change monotonously, determining that the target exists and sending out an early warning signal. The method solves the problems of unreliability and high false alarm rate of the existing underwater acoustic small platform line spectrum detection technology, provides an effective target detection and judgment method for an underwater acoustic monitoring small platform, is simple to implement, and can effectively prevent the defect of high false alarm rate when the traditional line spectrum detection method does not consider amplitude and orientation changes.

Description

technical field [0001] The disclosure belongs to the technical field of underwater acoustic signal processing and detection, and in particular relates to an automatic detection and judgment method of a line spectrum of a vector hydrophone. Background technique [0002] Small underwater acoustic monitoring platforms such as noise monitoring submersibles generally use broadband signals of underwater targets to detect targets. With the development of noise reduction and noise reduction technology, the broadband energy radiated by underwater targets is getting lower and lower, which brings great difficulties to the broadband detection and integral detection method adopted by traditional small monitoring platforms. However, the low-frequency line spectrum features of underwater targets are difficult to eliminate, so the low-frequency line spectrum detection method has been paid more attention. The main problem of the existing small platform line spectrum detection technology is ...

AI Technical Summary

Problems solved by technology

[0003] In view of this, this disclosure proposes a method for automatic detection and judgment of vector hydrophone line spectrum, which solves the problems of unreliable line spectrum detection technology and high false alarm rate of existing small underwater acoustic platform, and provides a new method for small underwater acoustic monitoring platform. An Effective Target Detection and Judgment Method

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