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Underwater acoustic target radiation noise linear array beam reconstruction method for output signal frequency spectrum

A radiation noise and output signal technology, applied in the field of underwater man-made target radiation signal analysis and signal analysis and processing, can solve the problems of large amount of calculation, etc., and achieve the effect of periodic pulse interference signal suppression and clear details

Inactive Publication Date: 2020-06-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, using the optimization method to design a wide-band constant beamwidth beam requires a large amount of calculation, and its application in practice is still subject to considerable restrictions.

Method used

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  • Underwater acoustic target radiation noise linear array beam reconstruction method for output signal frequency spectrum
  • Underwater acoustic target radiation noise linear array beam reconstruction method for output signal frequency spectrum
  • Underwater acoustic target radiation noise linear array beam reconstruction method for output signal frequency spectrum

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Embodiment

[0079] Step 1: Use a 96-element line array of underwater target radiation noise data x 1 (n), x 2 (n)...x 96 (n), duration 600s, sampling frequency 2048Hz. Read the 96-element data in the first second, perform fast Fourier transform on the signals of each channel, and obtain the data x f1 (n), x f2 (n)...x f96 (n).

[0080] Step 2: Considering that the frequency response range of the hydrophone is 50Hz-100kHz, and the data sampling frequency is 2048Hz, select the lower limit nf_l of the frequency band to be restored as 50Hz, and the upper limit nf_h as 1024Hz. The extracted corresponding frequency band signal is x' f1 (n),...,x' f96 (n).

[0081] Step 3: This array is a uniform linear array, p 1 =0m,p 2 =4m,...,p 96 = 380m. The range of azimuth angle is 0 to 180 degrees, and the resolution is 1 degree. According to the frequency range of 50-1024Hz set in the previous step, the frequency interval is 1Hz, and the orientation dictionary D is constructed for each freque...

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Abstract

The invention provides an underwater acoustic target radiation noise linear array beam reconstruction method for an output signal frequency spectrum. The method comprises the following steps of firstly, converting a linear array multi-channel signal to a frequency domain through Fourier transform; then, creating a dimensional orientation space, creating observation vectors at all frequency pointswithin the selected frequency spectrum; adding a spatial response consistency constraint for all frequency points to create a a multi-frequency-point multi-task sparse decomposition model; finally, deducing and estimating a posteriori mean value of a sparse decomposition coefficient by using Bayesian variational to obtain frequency spectrum amplitudes on all frequency points in all directionsincluding a target direction. Compared with a traditional conventional beam forming method, the method has the advantage that the target frequency spectrum of the 500-1000Hz medium-high frequency band in the radiation noise signal can be better recovered.

Description

technical field [0001] The invention relates to the field of signal analysis and processing, and can be used in the field of analysis and processing of radiation signals of underwater artificial targets collected by line arrays. The present invention obtains array gain by performing beamforming, and on the basis of the consistency of spatial response in different frequency bands, realizes the requirement of constant beamwidth of beams at different frequency points by adding structured sparse constraints, and reduces the beam width caused by the change of beamwidth with frequency. The effect of signal distortion. Compared with the traditional beam forming method, the present invention can better restore the middle and high frequency signal components of the target radiation noise. Background technique [0002] The detection of the existence of underwater targets and the analysis of the characteristics of underwater targets are inseparable from the sonar hydrophone array to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/88G01S15/04G01S7/539G01S7/527G01S7/536
CPCG01S15/88G01S15/04G01S7/539G01S7/527G01S7/536
Inventor 曾向阳陆晨翔乔彦杨爽
Owner NORTHWESTERN POLYTECHNICAL UNIV
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