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Adaptive Beamforming Method Based on Uniform Linear Array Null Deepening

An adaptive beam, uniform straight line technology, applied in the field of signal processing, can solve the problem of degraded anti-interference performance, insufficient to completely suppress interference, etc.

Active Publication Date: 2021-04-20
XIDIAN UNIV
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Problems solved by technology

[0007] The maximum signal-to-interference-noise ratio SINR criterion maximizes the ratio of useful signal power to interference signal and noise power. This criterion can obtain the maximum signal-to-noise ratio, but the statistical characteristics of the noise and the direction of arrival of the desired signal must be known.
[0008] The above criteria are widely used in adaptive beamforming, but when the interference power fluctuates, the null depth of adaptive beamforming is not enough to completely suppress the interference, so that the output signal of the beamformer still contains interference components, and the anti-interference performance drops sharply

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  • Adaptive Beamforming Method Based on Uniform Linear Array Null Deepening
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  • Adaptive Beamforming Method Based on Uniform Linear Array Null Deepening

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] refer to figure 1 , the implementation steps of the present invention include as follows:

[0041] Step 1, obtain the relevant parameters of the uniform antenna array and the relevant parameters of the incoming signal.

[0042] Set the relevant parameters of the incoming signal, including the number M of interference signals and the direction of arrival θ of the kth signal k , k=1,2,...,M, the direction of arrival of the desired signal θ 0 , signal source frequency f and emission signal wavelength λ;

[0043] According to the antenna arrangement, obtain the relevant parameters of the linear array antenna, including the number N of the array elements of the linear array and the interval d of the array elements, and the antenna array receives the data x(t).

[0044] Step 2, use the antenna array to receive data x(t), and calculate the autocorrelation...

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Abstract

The present invention proposes an adaptive beamforming method based on uniform linear array null depth deepening, which mainly solves the problem in the prior art that the null depth of the antenna pattern cannot completely suppress interference due to interference power fluctuations. The implementation steps are: 1. Obtain the relevant parameters of the uniform antenna array and the relevant parameters of the incoming signal; 2. Use the antenna array to receive data and calculate the autocorrelation matrix of the data received by the antenna array; 3. Use the relevant parameters of the antenna array to calculate the expected Signal direction vector and steering vector matrix; 4. Using matrix singular value decomposition to decompose the autocorrelation matrix to construct a new interference subspace; 5. Using the new interference subspace matrix and the direction vector of the desired signal to calculate the null trap Optimal weight coefficients for adaptive beamforming after deepening. The invention deepens the zero trap of the interference signal, improves the anti-interference performance, and can be used in a signal processing system.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an adaptive beam forming method, which can be used in a signal anti-interference processing system. Background technique [0002] In the field of communication and radar, adaptive antenna is one of the most important components. The adaptive antenna can automatically align the maximum radiation direction of the antenna with the incoming wave direction of the required signal, and align the lobe null of the antenna pattern with the interference direction. An effective measure, which consists of an antenna array and an adaptive processing system, so it is also called an adaptive array. [0003] The core of the adaptive processing system is adaptive beamforming. Adaptive beamforming refers to adjusting the weight vector adaptively in real time according to a certain beamforming criterion and algorithm, so that after the received signals of each array element ar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/0456
CPCH04B7/0456H04B7/0854H04B7/086
Inventor 相征张钰炜任鹏任怡
Owner XIDIAN UNIV