Broadband transmitting adaptive beamforming method based on subband linear multi-constraint minimum variance criterion

An adaptive beam, minimum variance technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as increased system load, increased computational load, and unfavorable engineering implementation, to improve system stability, facilitate engineering implementation, and reduce system costs. The effect of calculation

Active Publication Date: 2018-11-20
HOHAI UNIV
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Problems solved by technology

Since the algorithm has some problems in the initial value setting of the conjugate iteration and the calculation of the iteration step is complicated, in order to obtain the optimal solutio

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  • Broadband transmitting adaptive beamforming method based on subband linear multi-constraint minimum variance criterion
  • Broadband transmitting adaptive beamforming method based on subband linear multi-constraint minimum variance criterion
  • Broadband transmitting adaptive beamforming method based on subband linear multi-constraint minimum variance criterion

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[0072] The technical solution of the present invention will be described in detail below in conjunction with the drawings:

[0073] A broadband transmission adaptive beamforming method based on the maximum signal-to-interference-noise ratio criterion of the subband, such as figure 1 As shown, it mainly includes the following steps:

[0074] Step 1. Design the broadband transmitting antenna array and calculate the output signal of the broadband array. The output signal x of the mth element m (n) Meet the formula:

[0075]

[0076] Among them, x(n-k) refers to the output discrete signal x(n) shifted k units to the left, w m [k] refers to the weighted value of the k-th tap of the m-th element, m=0,1,...,M-1, k=0,1,...,J-1, M is the total number of elements, J is Tapped delay line coefficient.

[0077] Step 2: Design a subband filter bank. The subband filter bank can be divided into an analysis filter bank and a comprehensive filter bank. The analysis filter bank is used for subband div...

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Abstract

The invention discloses a broadband transmitting adaptive beamforming method based on a subband linear multi-constraint minimum variance criterion. The method includes steps of 1, designing a broadband transmitting antenna array and calculating output signals of a broadband array; 2, designing a subband filter bank; 3, utilizing an analysis filter bank in the subband filter bank to complete subband division of the broadband signals; 4, calculate an adaptive beamforming weight vector of each subband based on the subband linear multi-constrained minimum variance criterion; 5, performing reconstruction on the processed wideband signal by using a synthesis filter bank in the subband filter bank. Compared with the prior art, the method of the invention has a low calculation amount, can form a deeper null in a desired direction, has stronger interference suppression and more stable system performance, and is favorable for engineering realization.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a broadband transmission adaptive beamforming method based on subband linear multi-constraint minimum variance criterion. Background technique [0002] Adaptive arrays deployed in modern radar systems often place nulls at the receiving end to attenuate interfering signals, such as hostile jamming, unintentional electromagnetic interference, or environmental clutter. The antennas of this scheme usually have a uniform amplitude on the aperture The transmission is weighted to maximize the main beam gain. This kind of signal processing technology at the radar receiving end has been perfected day by day, and it is becoming more and more difficult to improve the detection performance by optimizing the radar receiving signal processing algorithm. Therefore, more and more research institutions have recently developed methods for creating zero The benefit of this techni...

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Application Information

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IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 沈明威王冠李建峰张琪汪晨辉
Owner HOHAI UNIV
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