Rapid broadband frequency domain beamforming method based on acoustic vector sensor uniform linear array

Abstract

The invention relates to a rapid broadband frequency domain beamforming method based on an acoustic vector sensor uniform linear array. The method comprises the following steps of: firstly, receiving spatial signals through the acoustic vector sensor uniform linear array to obtain time domain signals of all array elements, wherein the time domain signals comprise time domain acoustic pressure signals and time domain vibration velocity signals, and performing Fourier transform on snapshot data needed to be processed so as to obtain a corresponding frequency domain signal; secondly, performing zero fill on the acoustic pressure signals and the vibration velocity signals of all the array elements in a space domain according to a frequency band range needed to be processed, performing fast Fourier transform (FFT) on the signals in the space domain, and transferring a zero frequency component of the transform result to a spectrum center; thirdly, performing alignment correction and corresponding linear addition on beam and space domain Fourier results at each frequency point of bandwidth needed to be processed according to a frequency-beam grid corresponding to the acoustic pressure signals and the vibration velocity signals so as to obtain beamforming results of different frequency points; and finally, synthesizing beamforming results of different frequencies to obtain power output of a linear array spatially.

Description

technical field [0001] The invention belongs to the field of sonar digital signal processing, in particular to a fast broadband frequency-domain beamforming method based on a uniform linear array of an acoustic vector sensor. Background technique [0002] Acoustic vector sensor is a new type of sensor, which can measure the sound pressure in the sound field and the orthogonal components of the particle velocity simultaneously, and obtain the relevant information of the scalar field and vector field in the sound field at the same time, which is far superior to the traditional sound pressure hydrophone. Both theoretical analysis and experiments have shown that the sound pressure and vibration velocity of the coherent source radiation sound field are completely correlated under far-field conditions, and the vibration velocity has a dipole natural directivity independent of frequency, while the sound pressure and vibration velocity of the background noise field is independent. ...

AI Technical Summary

Problems solved by technology

However, compared with the uniform linear array of the traditional sound pressure hydrophone, the uniform linear array of the acoustic vector sensor has more processing of the component signals of the vibration velocity, and the dimension of its processing is also greatly increased compared with the latter, and the time brought by the processing There is a corresponding increase in cost, especially for frequency domain processing of wideband signals

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