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Sound beam forming method based on iterative algorithm

An iterative algorithm, beam technology, applied in the field of robust adaptive beamforming processing, which can solve problems such as array vector mismatch

Inactive Publication Date: 2014-07-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a robust beamforming method based on iterative algorithm for the problem of array steering vector mismatch under the background of strong desired signal in the prior art, through LMS iterative power inversion (Power Inversion, hereinafter PI) algorithm, which reconstructs the interference noise covariance matrix, thereby directly avoiding the method of matrix inversion operation in the traditional algorithm

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  • Sound beam forming method based on iterative algorithm
  • Sound beam forming method based on iterative algorithm
  • Sound beam forming method based on iterative algorithm

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[0073] The robust beamforming method based on iterative algorithm in this example, firstly, use the PI spectrum to calculate the weight of the PI algorithm; secondly, use the PI spectrum and the weight of the PI algorithm to reconstruct the interference noise covariance matrix outside the possible spatial range of the desired signal ;Finally, using the obtained reconstructed interference noise covariance matrix, calculate the optimal weight of the beamformer, and then repeat the cyclic PI algorithm, thereby updating the optimal weight vector of the beamformer.

[0074] Specifically, the weight of the PI algorithm is calculated as follows:

[0075] First, the LMS algorithm is used to iteratively calculate the weight of the PI algorithm, and the weight of the PI algorithm is calculated as w PI ;

[0076] w PI =[w 1 ,w 2 ,...,w M ] T

[0077] Among them, M is the number of array elements, T is transpose calculation, w M is the PI algorithm weight of the Mth array element....

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Abstract

The invention relates to the technology of sound and self-adaptive beam forming processing. A sound beam forming method based on the iterative algorithm is provided for solving the mismatching problem of array guiding vectors on the background of highly desired signals in the prior art. The sound beam forming method comprises the first step of working out the weight of the PI algorithm through a PI spectrum, the second step of reconstructing an interference noise covariance matrix out of the possible empty domain range of the desired signals according to the PI spectrum and the PI algorithm, and the last step of calculating the optimal weight of a beam forming device according to the reconstructed interference noise covariance matrix and repeatedly executing the PI algorithm, and the optimal weight vector of the beam forming device is updated. The interference noise covariance matrix is reconstructed based on the LMS iteration power inversion algorithm, and accordingly the matrix inverse operation in the traditional algorithm is directly avoided.

Description

technical field [0001] The present invention relates to a robust adaptive beamforming processing technology, in particular to a robust beamforming method based on an iterative algorithm Background technique [0002] One of the most important research contents of array signal processing is beamforming technology, which can be divided into ordinary beamforming technology and adaptive beamforming technology. Using beamforming technology, it is possible to enhance the desired signal while suppressing interference. The weight coefficient of ordinary beamforming technology is fixed, and the anti-interference performance is poor. Adaptive beamforming is equivalent to a one-Wener filtering process, which can automatically adjust the weight coefficients with the changing signal environment, so that the main lobe of the beam is aligned with the desired signal direction to enhance the useful signal, and the null trap is aligned with the interference direction to suppress interference....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
Inventor 谢菊兰王剑锋张俊波李迅罗倩李会勇王旭
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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