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U-shaped array beam forming weighting method

A beam, U-shaped technology, applied in the field of U-shaped array beamforming weighting, can solve the problem of window function weights that do not match the position of the array elements, and the weights are not optimal, achieving a small amount of calculation, improved performance, and easy implementation Effect

Active Publication Date: 2008-03-26
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
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  • U-shaped array beam forming weighting method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with specific embodiments and drawings:

[0035] The beamforming process block diagram of the present invention is shown in Fig. 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 the signal, and perform pre-processing such as time filtering, A / D conversion, and amplification on the received signal of the base array through the pre-processing machine. Let the array element numbers be 1, 2, ..., M, 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, transforms 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 x m (f) is the value of the m-th array ...

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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-lobe effectively, 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 is mainly a U-shaped array beam forming weighting method. Background technique [0002] Beamforming is a hot research issue in sonar signal processing. Both passive sonar and active sonar must have a beam forming system. The beamforming system is the core component of the modern sonar system, and it is the foundation of the sonar's good tactics and technical performance. Conventional beamforming (CBF) is a classic method in array signal processing. Its advantages are simple structure, easy implementation, and good adaptability to various harsh environments. Although various high-resolution algorithms continue to emerge, the conventional beamforming method (CBF) is still the most widely used method in engineering. [0003] Multiply the amplitude of the output signal of each element by a real number, and use this method to improve the dire...

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Application Information

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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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