Optimal Frequency Invariant Response Super-Directional Beamforming Method for Circular Array

A super-directional beam, frequency-invariant technology, applied in the direction of sounding equipment, instruments, etc., can solve the problem of not guaranteeing the desired beam and so on

Active Publication Date: 2020-10-27
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, the desired beam of this method is obtained by synthesizing circular arrays with the same number of array elements, and can only be given in advance, which cannot guarantee that the desired beam is the best choice to meet the requirements

Method used

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  • Optimal Frequency Invariant Response Super-Directional Beamforming Method for Circular Array
  • Optimal Frequency Invariant Response Super-Directional Beamforming Method for Circular Array
  • Optimal Frequency Invariant Response Super-Directional Beamforming Method for Circular Array

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Embodiment Construction

[0051] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0052] The embodiment of the present invention can provide the function of the weight vector and the weight vector of the expected beam at different frequencies of the uniform circular array under the minimum mean square error criterion, and obtain the optimal expected beam satisfying the constraint conditions, and then synthesize the broadband Frequency invariant response super-directional beam. The process is:

[0053] 1. Give the expression of the generalized desired beam. Since the annular array pays more attention to the performance of beamforming in the horizontal plane, only two-dimensional beams in the horizontal range are considered. The generalized desired beam can be expressed as follows:

[0054]

[0055] The N (N>0) is the highest order, φ is the horizontal azimuth, φ 0 is the beam main lobe direction, a=[a -N ,...a 0 ,...,a N ] T is a...

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Abstract

The invention relates to a circular array optimal frequency-invariant responsive robust superdirective beamforming method, aiming at providing an optimal frequency-invariant responsive robust superdirective beamforming method for even circular arrays. The method firstly proposes a generalized expectation beamforming expression, expresses weight vectors at different frequencies to a function of expectation beamforming weight vectors, then establishes the problem of multi-constraint optimization, acquires an optimal expectation constrain which meets constraint conditions, and eventually acquiring weight vectors at other frequencies through the function relation, and synthesizing the weight vectors to obtain bandwidth frequency-invariant responsive robust superdirective beams. The method herein can flexibly control the shape of beams, can acquire frequency-invariant responsive robust superdirective beams with a wider frequency range, and can acquire the optimal expectation beam which meet the constraint conditions.

Description

technical field [0001] The invention belongs to the fields of acoustic array signal processing and sonar technology, and is a beamforming method, relating to a circular array optimal frequency invariant response super-directivity beamforming method, in particular to a frequency invariant response super-directivity A beamforming method for wideband target detection and wideband target orientation estimation for circular arrays. Background technique [0002] In the fields of sonar, radar, communication, and voice engineering, arrays are commonly used to receive broadband signals and process them to achieve target detection, positioning, and resolution. The frequency-invariant response super-directional beamforming method can not only ensure that the broadband signal is not distorted, but also obtain better spatial directivity and signal-to-noise ratio gain, which can significantly improve the correlation performance of array processing, so it has attracted much attention. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/26
CPCG10K11/26
Inventor 汪勇杨益新马远良雷波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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