Beam forming method and device based on vector extended co-prime array

Abstract

The invention discloses a beam forming method and device based on a vector extended co-prime array. The method comprises the following steps: step 1, on the premise that the array element number of a vector array needs to be set, coprime array element number initial values M and N are drawn up for an underwater acoustic vector array of a specified physical array element; 2, according to the sub-array beam output zero point and grating lobe position characteristics of the co-prime array, an array expansion factor is set, and an initial co-prime array element pair is expanded; 3, changing a sub-array data channel combination by using a sound pressure and vibration velocity combined processing method to reduce array beam output grating lobes; 4, an array weighting factor based on sound pressure and vibration velocity combined processing is set to further reduce beam output side lobes; and step 5, obtaining final vector extension co-prime array beam output spatial spectrum synthesis by using co-prime array beam forming. According to the invention, the extended co-prime vector array beam output with low grating lobe, low side lobe and narrow main lobe can be obtained.

Description

technical field [0001] The invention relates to an underwater acoustic signal processing technology, in particular to a beam forming method and device based on a vector expanded coprime array. Background technique [0002] In underwater acoustic vector array signal processing, for a uniform array, the limited number of array elements limits the array aperture, thus limiting the array's degree of freedom. The proposal of sparse array enables the traditional uniform array to obtain larger array aperture and higher degree of freedom, thereby obtaining higher spectral estimation accuracy and more advantageous resolution. A coprime array is a special structure of a sparse array, which can be composed of two subarrays whose array elements are mutually prime, and the array element spacing of the two subarrays is the number of elements of the other subarray multiplied by the half-wave spacing. . Compared with other forms of sparse arrays, the position of the array elements formed ...

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Problems solved by technology

[0003] The present invention aims to solve the problem of high sidelobe grating lobes in the application of coprime arrays in underwater acoustic vector arrays, thereby affecting the performance of beamforming and target azimuth estimation, and at the same time, the problem of high software and hardware complexity in engineering implementation

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