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DOA estimation direction finding ambiguity elimination method for near-field microphone array

A technology of microphone array and DOA, which is applied in the system of eliminating unnecessary waves, the direction finder using ultrasonic/sonic wave/infrasonic wave, the system of determining direction or offset, etc. Sterling sampling law and other issues to achieve the effect of solving direction finding ambiguity

Active Publication Date: 2021-02-02
SICHUAN UNIV
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Problems solved by technology

However, when the distance between the elements of the distributed array is greater than half a wavelength, the Nyquist sampling law in the space domain is not satisfied, and the direction finding ambiguity problem will occur.

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  • DOA estimation direction finding ambiguity elimination method for near-field microphone array
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  • DOA estimation direction finding ambiguity elimination method for near-field microphone array

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the invention are not limited to the specific examples provided.

[0014] refer to Figure 1-3 As shown, the present invention provides a near-field microphone array DOA estimation direction finding fuzzy elimination method, comprising the following steps:

[0015] S1. Arranging an array with M array elements in a distributed array, marking the M array elements according to the received signal power from large to small and constructing a set A;

[0016] S2. Select the microphone array element M with the shortest straight-line distance from the sound source in the set A 1 As a reference array element; select the maximum received signal power array element M from the remaining M-1 array elements 2 , M 3 Together with the reference array elements form V 1 Array; select the maximum received signal pow...

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Abstract

The invention discloses a DOA estimation direction finding ambiguity elimination method for a near-field microphone array. The method comprises the following steps: S1, performing distributed array arrangement on an array with the array element number of M, marking M array elements according to received signal power from large to small, and constructing a set A; S2, selecting a microphone array element M1 with the shortest linear distance from the sound production source in the set A as a reference array element, selecting an array element M2 and an array element M3 with the maximum received signal power from the remaining M1 array elements to form a V1 array together with the reference array element, and selecting an array element M4 and an array element M5 with the maximum received signal power from the remaining M3 array elements to form a V2 array together with the reference array element; S3, dividing the broadband signal into L narrow-band signals of which the central angular frequencies are omega1, omega2,..., omegaL respectively, performing signal DOA estimation on V1 and V2 array receiving signals through a MUSIC algorithm respectively to obtain two spatial spectrums, andthen performing normalization processing on the two spatial spectrums; and S4, performing spectral peak subtraction on the spatial spectrums of the DOA estimation results of the V1 array and the V2 array, and filtering out false peaks.

Description

technical field [0001] The invention relates to the technical field of near-field array defuzzification, in particular to a near-field microphone array DOA estimation and direction finding ambiguity elimination method. Background technique [0002] Array signal processing technology is widely used in radar, sonar, seismic exploration, wireless communication and other fields. Direction of Arrival (DOA) estimation is an important branch of array signal processing technology. DOA estimation can accurately obtain the spatial position and orientation information of the source through the array receiving data. Compared with the traditional regular array, the distributed array has the flexibility of array arrangement. With the advantages of high resolution, it has broad application prospects in shipboard radar target detection, airport sound source location and other occasions. However, when the distance between the elements of the distributed array is greater than half a waveleng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/86G01S3/803
CPCG01S3/86G01S3/803Y02D30/70
Inventor 何培宇喻伟闯潘帆崔敖徐自励周鹤王宏
Owner SICHUAN UNIV
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