Research On Line Spectrum Detection Technology Based On Vector Hydrophone

With the in-depth research of various countries on submarine,torpedo and other underwater target vibration and noise reduction technologies,the signal-to-noise ratio of the target signal received by the passive sonar system is getting lower and lower,which brings new difficulties to target detection and positioning technologies.The emergence of vector signal processing technology provides target detection and surface or underwater target recognition.for news ways and means.This article focuses on the signal processing method of the vector hydrophone,then applies the signal coherent accumulation power spectrum technology to vector signal processing technology.This paper design a visual software,which facilitates the practical application of vector signal detection technology in the engineering field.The main research work as follows1.The acoustic energy flux detector is a maximum likelihood ratio detector,and the combined processing of sound pressure and vibration velocity can effectively increase the output gain of the line spectrum signal.On the basis of a single vector hydrophone,This paper uses vector array spatial spectrum estimation theory for preprocessing,and then proposes a method for joint processing of sound pressure and vibration velocity of hydrophone array2.The segmented averaging technique(Welch)in classical power spectrum estimation does not consider the phase relationship,and its processing gain will vary with the number of segments.The coherent accumulation power spectrum estimation can effectively improve the problem of gain loss.This paper introduces two phase compensation methods from different angles:coherently averaged power spectral estimate method(CAPSE)and three-point interpolation estimation method,and verifies the detection performance of different detection methods.The results show that the power spectrum estimation using the coherent accumulation algorithm is better than the traditional incoherent power spectrum estimation.3.When the background noise contains Gaussian color noise interference,it will affect the effect of line spectrum detection.This paper establishes a Gaussian colored noise simulation model and verifies the line spectrum detection ability of the coherent accumulated power spectrum technology when the background noise is Gaussian colored noise.The simulation results show that the coherent acumulation power spectrum estimation also has a good detection ability in a more complicated marine environment.Analyze the sea trial data.The application of coherent accumulation power spectrum technology to the combined processing of sound pressure and vibration velocity of vector hydrophones can greatly improve the detection ability of line spectrum signals in the background of noise.4.Design the visual interface of the algorithm,and develop the application program through Qt.