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U-shaped array beam forming weighting method

A beam and U-shaped technology, applied in the field of U-shaped array beamforming weighting, can solve problems such as the weight value is not optimal, the window function weight value does not match the position of the array element, etc., and achieves a small amount of calculation, a simple calculation method, and easy Achieved effect

Active Publication Date: 2010-12-29
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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AI Technical Summary

Problems solved by technology

For non-uniform arrays like "U" arrays, the weights of the window function do not match the positions of the array elements, so the weights are not optimal

Method used

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  • U-shaped array beam forming weighting method
  • U-shaped array beam forming weighting method
  • U-shaped array beam forming weighting method

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Embodiment Construction

[0034] Below in conjunction with specific embodiment and accompanying drawing, the present invention will be further described:

[0035] The flow chart of the beamforming process of the present invention is shown in Figure 1. This U-shaped array beamforming weighting method specifically includes the following steps:

[0036] Step 1: Use the M-element "U"-shaped array to receive signals, and perform pre-processing such as time filtering, A / D conversion, and amplification on the received signals of the array through a pre-preprocessor. Let the numbers of the array elements be 1, 2, ..., M respectively, then the output signal of the array element is:

[0037] x(n)=[x 1 (n),x 2 (n),...,x M (n)] T (1)

[0038] Step 2: The signal processor performs fast Fourier transform (FFT) on the time signal, transforming the signal from the time domain to the frequency domain, and the frequency domain output is:

[0039] X(f)=[x 1 (f),x 2 (f),...,x M (f)] T (2)

[0040] where...

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Abstract

This invention relates to the sonar signal processor field, it is main a kind of U array wave-packet formation weighted method, confirms the interpolation point according to the projection coordinate ubiety of the U array component in the wave array surface direction which is upright with the wave-packet pre-produced direction, calculates the modified window function value matched the U array component location. This invention provides a new U array wave-packet formation weighted method, extends the window function weight based on uniform array to non-uniform array weight, restrains side-lobeeffectively, and improves the ability of the array wave-packet formation.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to the field of array signal processing, and mainly relates to a U-shaped array beam forming weighting method. Background technique [0002] Beamforming is a hot research problem in sonar signal processing. Both passive sonar and active sonar must have a beamforming system. The beamforming system is the core component of the modern sonar system, and it is the basis for the good tactical and technical performance of the sonar. Coventional beamforming (CBF for short) is a classic method in array signal processing. It has the advantages of simple structure, easy implementation, and good adaptability to various harsh environments. Although various high-resolution algorithms are emerging, conventional beamforming (CBF) is still the most widely used method in engineering. [0003] The output signal of each array element is multiplied by a real number in amplitude, and this method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/52G01S7/539G01S15/00
Inventor 胡鹏丁烽李然威
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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