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Congestion array beam forming method based on broadband focusing matrix

A broadband focusing and focusing matrix technology, applied in the re-radiation of sound waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problems of SINR drop, side lobe increase, main beam distortion, etc., to improve operation speed and simplify. Processing flow, the effect of reducing the number of broadband blocking times

Active Publication Date: 2017-10-17
HARBIN ENG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a blocking array beamforming method based on broadband focusing matrix that can solve the main beam distortion caused by conventional interference suppression technology when the interference echo is located in the main lobe, the side lobe rises, and the SINR drops.

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  • Congestion array beam forming method based on broadband focusing matrix
  • Congestion array beam forming method based on broadband focusing matrix
  • Congestion array beam forming method based on broadband focusing matrix

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Embodiment Construction

[0030] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0031] combine figure 1 -3, a kind of blocking array beamforming method based on broadband focusing matrix provided by the present invention, comprises the following steps:

[0032] Step 1. Divide the signal bandwidth into J subbands equally, and perform Fourier transform on the received signal to obtain a wideband frequency domain snapshot X.

[0033] Step 2. Take the interference direction as the fixed direction and the signal center frequency as the focusing frequency to generate the focusing matrix T B , perform the first focus transformation on the frequency-domain snapshot.

[0034] Step 3. Generate a blocking matrix B according to the focus frequency, block the frequency-domain snapshot data after the first focus transformation, and obtain the frequency-domain snapshot data X with interference removed B .

[0035] Step 4, the frequency domain snapshot d...

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Abstract

The objective of the invention lies in providing a congestion array beam forming method based on a broadband focusing matrix, and the method mainly comprises the following steps: carrying out the equal dividing of signal bandwidth, and obtaining broadband frequency domain output; taking an interference direction as a reference, and carrying out the first focusing conversion of a frequency domain snapshot; carrying out the congestion according to a congestion matrix generated through the focusing frequency, and removing the interference; generating a secondary focusing matrix, and carrying out the broadband focusing processing of the congested data; carrying out the conventional beam forming, and obtaining a target DOA (direction of arrival). The method simplifies a step of carrying out the congestion of a conventional broadband congestion matrix at each subband through the first focusing conversion. The standard broadband incident vector form of a congested signal is obtained through deduction, and a step of beam forming at each subband is simplified through secondary focusing conversion. The method simplifies the processing flow under the condition that the performances of a broadband congestion matrix are not damaged, and effectively improves the calculation speed.

Description

technical field [0001] The invention relates to a sonar signal processing method, in particular to a broadband beam forming method. Background technique [0002] The signal received by the array element can form the directionality of the array receiving system after being processed by beamforming; it can filter out environmental noise and improve the signal-to-noise ratio; it can perform spatial filtering to suppress spatial interference; it can perform multi-target resolution and provide target azimuth estimation; It can create conditions for target positioning or distance and depth estimation; and provide information for target identification. The wideband signal has more sufficient target information, which makes it have stronger advantages in target detection, parameter estimation, and target feature extraction. Therefore, the beamforming algorithm for wideband signals has greater research value. [0003] Adaptive beamforming is widely used in practice, especially in ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539G01S7/537G01S15/88
CPCG01S7/537G01S7/539G01S15/88
Inventor 生雪莉芦嘉石亚莉陈洋苍思远郭龙祥陆典
Owner HARBIN ENG UNIV