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Fast adaptive beamforming algorithm based on block matrix

A technology of adaptive beam and block matrix, applied in complex mathematical operations, radio wave measurement systems, instruments, etc., can solve problems that restrict the performance of underwater acoustic detection equipment

Active Publication Date: 2021-04-27
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

Since matrix multiplication and inversion operations in engineering applications consume a lot of resources, the computational complexity increases exponentially with the increase of the matrix size. At present, the array scale of underwater acoustic detection equipment is getting larger and larger, such as underwater imaging sonar The equipment can reach hundreds of array elements, and the complex calculation of high-dimensional matrix seriously restricts the performance of underwater acoustic detection equipment

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  • Fast adaptive beamforming algorithm based on block matrix
  • Fast adaptive beamforming algorithm based on block matrix
  • Fast adaptive beamforming algorithm based on block matrix

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with accompanying drawing:

[0025] as attached Figure 1-3 As shown, this fast adaptive beamforming algorithm based on block matrix mainly includes the following steps:

[0026] 1) Let the number of elements of the base array be N, and the input data of each snapshot is X=[x 1 x 2 … x N ] H ,x i is the sampling data of the i-th array element, then the data covariance matrix R is

[0027]

[0028] Among them, a, b, and s are weighting factors, which represent the proportion of old and new components in the covariance matrix, and are set to 1 for the convenience of calculation. Assuming that the array is uniform and the array element spacing is d, the steering vector is w=exp(-jωτ), where ω is the angular frequency, τ i = d i sin(θ) / c is the delay of the i-th array element relative to the first array element in the θ direction. Taking MVDR adaptive beamforming as an example, its spatial ...

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Abstract

The invention discloses a fast adaptive beamforming algorithm based on a block matrix. The algorithm mainly involves matrix block processing; a high-dimensional matrix is split into a low-dimensional matrix; overlapped parts in the operation process of the low-dimensional matrix are sorted and combined by using the particularity of adaptive signal processing and a recursive processing method, so that computation complexity can be reduced. According to the algorithm, a data covariance matrix does not need to be inversed, meanwhile, the dimension of the involved matrix is only half of that of an original matrix, so that the engineering implementation difficulty is reduced, a large number of operation resources are saved through dimension reduction operation; the method has a remarkable processing effect for large-scale array signals; and it is verified that the calculation efficiency of the algorithm of the invention is improved by 20% or above compared with a conventional self-adaptive algorithm.

Description

technical field [0001] The invention relates to the field of sonar array signal processing, in particular to a fast adaptive beam forming algorithm based on block matrix. Background technique [0002] In the process of sonar detection, it is necessary to use beamforming technology to process the received signal of the array, enhance the target signal, and suppress interference and noise signals. With the development of technology and the increasingly complex underwater environment, the requirements for the quality of beamforming are also getting higher and higher. Among various beamforming algorithms, the adaptive algorithm has attracted attention due to its high resolution and high output signal-to-noise ratio, and is currently widely used in various types of ocean detection equipment. However, the core of the adaptive algorithm is to use data feedback to update the steering vector iteratively, and it needs to invert the data covariance matrix. Since matrix multiplication...

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Application Information

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IPC IPC(8): G01S7/52G06F17/16
CPCG01S7/52G06F17/16Y02D30/70
Inventor 谷新禹孙微
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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