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Sub-band processing method and frequency-space cascade broadband adaptive wave beam acquiring method

A technology of adaptive beam and processing method, applied in the direction of space transmit diversity, radio transmission system, electrical components, etc., can solve the problem of signal cancellation in the frequency domain, achieve the problem of signal cancellation, high computing efficiency, and easy engineering implementation Effect

Active Publication Date: 2017-01-04
HOHAI UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a sub-band processing method that solves the problem of signal cancellation in the frequency domain in the prior art

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, structure and working process of the present invention will be further described.

[0039] In order to facilitate the analysis, this patent takes the uniform linear array as an example, and the geometric configuration of the array structure is as follows figure 1 As shown, the number of array elements is M, the beam direction of the broadband array is θ, and the carrier frequency is f 0 , the transmission signal is a linear frequency modulation signal (LFM), the bandwidth of the LFM signal is B, the time width is T, and its frequency modulation slope K=B / T, after down-conversion, the sampling frequency of the array time domain is f s , then the broadband array received signal is:

[0040] X(t)=s(t)+i(t)+n(t)

[0041] Among them, X(t) represents the received signal in the array time domain, s(t) represents the received signal in the target time domain, i(t) represents the interference time domain signal, and n(t) represen...

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Abstract

The invention discloses a sub-band processing method and a frequency-space cascade broadband adaptive wave beam acquiring method and aims to solve a broadband array aperture transition problem. The method comprises steps that firstly, each channel reception signal is converted from a time domain to a frequency domain through fast Fourier transform FFT, and aperture transition compensation of a broadband array is realized in the frequency domain; the broadband reception signals in the frequency domain are divided into sub-bands, sub-band pulse compression of the sub-bands is respectively carried out, adaptive spatial domain beam formation (ADBF) of each sub-band pulse compression data is carried out one distance unit by one distance unit, and ADBF weight is calculated through a conjugate gradient method (CG); fast Fourier transform FFT of each sub-band ADBF output signal is carried out to synthesize a broadband signal, and a broadband ADBF output signal is acquired through inverse fast Fourier transform (IFFT). Through the method, broadband array ADBF aperture transition and signal cancellation problems are solved, operation efficiency is high, and project implementation is easy.

Description

technical field [0001] The invention belongs to the field of broadband array adaptive beam forming, and in particular relates to a subband processing method and a frequency-space cascaded broadband adaptive beam acquisition method. Background technique [0002] Traditional digital beamforming (DBF) is generally aimed at narrowband signals. As array signal processing applications become wider and wider, narrowband signals can no longer meet engineering needs, and broadband beamforming has become a research hotspot. For broadband signals, during the beamforming process of the phased array antenna, due to the aperture transit time, the signals received by each unit of the antenna cannot be added in phase to the allowable extent, resulting in the broadening of the main lobe after the signal pulse pressure, so This limits the improvement of the instantaneous signal bandwidth of the phased array. In addition, the beam dispersion phenomenon of the phased array broadband operation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06H04B7/08
CPCH04B7/0413H04B7/0617H04B7/0663H04B7/0891
Inventor 沈明威胡佩郑家芝陶震纪存孝张琪
Owner HOHAI UNIV
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