Research On Sound Source Localization Technology Based On Coprime Array

Sound source localization,also known as sound source DOA estimation,is an important research direction in the field of acoustic research.How to quickly and accurately determine the direction or location of the sound source is the key to sound source localization technology.As the main tool for sound source localization,designing an appropriate array form can not only improve the speed and accuracy of sound source localization,but also save the corresponding software and hardware costs.Limited by Nyquist's sampling law,the maximum array element spacing of a uniform array is only half of the wavelength of the sound signal,and its parameters such as resolution and effective dynamic range are significantly lower.A sparse uniform array whose number of elements satisfies the coprime condition and the arrangement of the elements satisfies the sparse placement is superimposed by the overlapping of the first elements,which breaks through the limitation of the Nyquist sampling law.Under the premise of changing,the array aperture is increased,and the accuracy of DOA estimation of the sound source is improved.Compared with a uniform array,parameters such as resolution and effective dynamic range are effectively improved.The work of this paper is based on the mutual prime array,and combined with related algorithms to demonstrate the advantages of the mutual prime array in the estimation of sound source DOA.The main contents of this article are as follows:1.Aiming at the problems of low array aperture,low resolution and effective dynamic range of uniform linear arrays in the estimation of sound source DOA,the flow matrix of the co-primitive linear array is derived,and the co-primitive linear array is studied A sound source DOA estimation method;for the deficiency of co-primitive linear arrays that can only do one-dimensional DOA estimation,a flow matrix of coprime circular arrays is derived;a DOA estimation method based on co-prime circular arrays is studied.2.Based on the MVDR beamforming algorithm,the DOA estimation performance of the coprime array and the uniform array is compared and analyzed.For the MVDR beamforming algorithm,the main lobe width is too wide and the side lobe level is high.Beamforming improved algorithm,simulation experiments show that the improved algorithm can obtain better performance.3.Based on the MUSIC algorithm,the DOA estimation method of the high-resolution sound source of the mutual prime array is studied,and the simulation comparison experiment verifies the performance advantages of the mutual prime array;in order to simplify the complexity of the circular array flow pattern,the phase mode excitation method is used to compare the prime The circular array is equivalent to a linear array,which reduces the calculation cost of the algorithm;the simulation comparison experiment shows that the phase mode excitation of the coprime circular array is more effective in calculation cost,resolution,and efficiency than the phase mode excitation of the uniform circular array.The dynamic range and DOA estimation error of the sound source are better.