A method and system for detecting line spectrum of an unknown target based on phase variance weighting

Abstract

The invention relates to an unknown target line spectrum detection method based on phase variance weighting and a system thereof. The unknown target line spectrum detection method is characterized in that a signal radiated by an unknown target can be received by a receiving array element; the signal received by the receiving array element can be filtered and amplified, and the sampling of the filtered and amplified data can be carried out to acquire a discrete signal, and by the Fourier conversion analysis of the discrete signal, the spectrum data can be acquired; various frequency unit phases can be extracted from the spectrum data; the signal received by the receiving array element can be updated, and the previous steps can be repeated until the number of the repeated times reaches the preset value M, and then every frequency unit is provided with M phase values; the variance calculation of the phase values of the frequency units can be carried out; the phase variance weighting statistic of all of the frequency units can be carried out to acquire the estimation values of the final spectrum, and the maximum value can be acquired from the estimation values of the final spectrum to acquire the estimation value of the signal line spectrum; and the estimation value of the signal line spectrum can be used to detect the line spectrum of the unknown target of the underwater target radiation noise.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to an unknown target line spectrum detection method and system based on phase variance weighting. Background technique [0002] Because passive sonar does not radiate signals to the outside, it has strong concealment and has always been one of the important means to detect, locate, track and identify underwater targets. However, with the continuous improvement of stealth technology, the signal-to-noise ratio of data received by passive sonar is continuously decreasing, and the performance requirements for passive sonar are becoming more and more stringent. The detection technology commonly used by passive sonar can no longer meet the needs of long-range target detection. Scholars have proved through theory and experiments that the radiated noise of underwater targets contains rich single-frequency components, especially in the low-frequency range. The rotation of the propelle...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the line spectrum of the target cannot be effectively detected in the prior art, thereby providing a method and system capable of effectively detecting the line spectrum of the target

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