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A Broadband Blocking Array Beamforming Method Based on Signal Subspace Focusing

A signal subspace and focusing matrix technology, applied in the re-radiation of sound waves, radio wave measurement systems, instruments, etc., can solve the problems of being unsuitable for low signal-to-noise ratio, performance degradation, and high side lobes, reducing the number of broadband blocking, The effect of reducing the influence of noise and improving the main side lobe ratio

Active Publication Date: 2019-11-12
HARBIN ENG UNIV
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Problems solved by technology

Compared with narrowband or single-frequency signal blocking array, the performance of conventional broadband blocking array is significantly lower, and the side lobe is high, so it is not suitable for low signal-to-noise ratio conditions

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  • A Broadband Blocking Array Beamforming Method Based on Signal Subspace Focusing
  • A Broadband Blocking Array Beamforming Method Based on Signal Subspace Focusing
  • A Broadband Blocking Array Beamforming Method Based on Signal Subspace Focusing

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Embodiment Construction

[0028] The broadband blocking array beamforming method based on signal subspace focusing provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0029] In this example, figure 1 It is a schematic diagram of sonar plane wave far-field reception. In the figure, both the expected echo and the interference echo come from the far field.

[0030] figure 2 It is a schematic diagram of a broadband blocking array beamforming method based on signal subspace focusing. According to this embodiment, the processing flow is as follows:

[0031] First, divide the bandwidth of the wideband signal into J subbands equally, perform Fourier transform on them, and record the wideband frequency domain output of the receiving station as

[0032] X=[X 1 ,X 2 ,...,X j ,...X J ]

[0033] where the frequency domain output of the jth subband can be expressed as

[0034] x j =a j (θ s )S sj +a j (θ i )S ij +N j

[0035] Among the...

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Abstract

The invention provides a broadband blocking array wave beam forming method based on signal subspace focusing. 1, The signal bandwidth is equally divided into J sub-bands; 2, characteristic decomposition is performed on the data covariance matrix of the jth sub-band so that the signal sub-spaces and the characteristic values are acquired; 3, a focusing frequency point is set and the focusing matrix of the jth sub-band is designed; 4, focusing transformation is performed on the data of the jth sub-band; 5, the blocking array of the focusing frequency point is designed and the focused data are blocked; and 6, wave beam forming is performed on the blocked data by using the weight vector and the expected signal azimuth is estimated. The broadband blocking frequency can be reduced through broadband focusing and the operation speed can be enhanced; the signal sub-spaces are focused to the same frequency point instead of focusing the signal components to the same frequency point so that the influence of the noise can be reduced and the main-to-sidelobe ratio can be enhanced; meanwhile, the focusing matrix is the unitary matrix so that the output signal-to-noise ratio is not changed and the statistical characteristics of the noise are not damaged.

Description

technical field [0001] The invention relates to a sonar signal processing method, in particular to a beam forming method for suppressing main lobe interference of broadband signals. Background technique [0002] The signal received by the array element can form the designed directivity after being processed by the beamforming of the basic array receiving system; 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. Compared with single-frequency signals, broadband signals contain more sufficient target information, which makes them have stronger advantages in target detection, parameter estimation, and target feature extraction. Therefore, there is greater research on beamformin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/88
CPCG01S15/88
Inventor 生雪莉芦嘉石亚莉陆典郭龙祥殷敬伟
Owner HARBIN ENG UNIV