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A Robust Beamforming Method Against Motion Jamming and Steering Mismatch

A motion interference and guidance technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of insignificant zero-sag widening and degraded algorithm performance.

Active Publication Date: 2020-12-15
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

2. The method of uncertain set constraints, a typical robust Capon beamforming (RCB) algorithm, but the sampling matrix still contains the desired signal, and the performance of the algorithm decreases when the steering vector mismatch angle is large
Gershman proposed a method of applying derivative constraints in the interference direction to widen the interference null, but the null widening of this method is not obvious

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  • A Robust Beamforming Method Against Motion Jamming and Steering Mismatch
  • A Robust Beamforming Method Against Motion Jamming and Steering Mismatch

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Embodiment Construction

[0067] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0068] The present invention proposes a robust beamforming method against motion interference and steering mismatch, such as figure 1 As shown, the specific steps are as follows.

[0069] Step 1: Establish an array signal model, determine the sampling covariance matrix of the array received signal and pre-estimate the signal direction:

[0070] (1) In this embodiment, an equidistant linear array with M array elements is considered (other array structures are also applicable), the array element spacing is half a wavelength, and the incident signals are all independent far-field narrowband signals. Set a desired signal from θ 0 direction of incidence and P directions for θ j (j=1,2,...,p) interference signal, and M>P+1;

[0071] (2) The data model received by the array can be expressed as:

[0072] X(k)=AS(k)+n(k)

[0073] In the formul...

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Abstract

The invention discloses an anti-motion-interference and anti-guide-mismatch robust beamforming method, which can solve the problem of the algorithm performance degradation of the adaptive antenna in the presence of the desired steering vector mismatch and the interference position disturbance. The robust beamforming method is implemented based on the covariance matrix reconstruction and quadraticconstraint on a weight value. The method can ensure that the desired signal is directed to the real direction when the desired steering vector mismatch is and the angle mismatch does not exceed 7 degrees, and the conventional adaptive beamforming performance is improved, a wider and deeper nulling can be realized at the interference position, the width is adjustable, and the performance of the algorithm is enhanced.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to a robust beam forming method. Background technique [0002] Adaptive beamforming is an important branch of array signal processing, and traditional adaptive beamforming can achieve good performance under ideal conditions, but when there is a mismatch in the array model and the steering vector cannot be obtained accurately, the performance of the beamformer will degrade. In addition, when the position of the interference source is disturbed, the vibration of the antenna receiving platform, etc., it is likely to move the interference out of the null position, and the conventional method is completely ineffective. [0003] At present, the robust algorithms proposed for array model mismatch are as follows: 1. Diagonal loading beamforming algorithm (DL) adds loading factors to the diagonal of the covariance matrix, thereby suppressing the noise in the weigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 葛俊祥沈肖雅
Owner NANJING UNIV OF INFORMATION SCI & TECH
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