A Robust Beamforming Method and System Based on Steering Vector Iterative Correction

Abstract

The invention provides a robust beamforming method and system based on steering vector iterative correction. The method comprises the steps of A. establishing an array antenna reception signal model, and determining an iterative boundary of a steering vector of a desired signal; B. establishing a robust beamformer based on the steering vector iterative correction, and solving for an array weight initial value according to a semi-definite programming method; C. solving for a steering vector estimation value of the desired signal according to the minimum output power criterion and steering vector unbiased estimation constraints, executing a step D when determining that an output value is less than or equal to a threshold, and executing a step E when determining that the output value is greater than the threshold; D. outputting an array weight corresponding to the output value; and E. updating the array weight according to a minimum variance distortionless method, and returning to execute the step C. The invention adopts the iterative method, solves for optimal values of the steering vector and the array weight at the same time, thereby beamforming only in the direction of the desired signal, and improves the output signal to interference plus noise power ratio of the beamformer.

Description

technical field [0001] The present invention relates to the technical field of array antennas, in particular to a robust beamforming method and system based on steering vector iterative correction. Background technique [0002] Ideally, the traditional adaptive beamforming method based on array antenna has a good output signal-to-interference-plus-noise ratio (SINR), which can effectively realize spatial filtering, that is, in the desired signal The beam is formed in the incident direction of the interference signal, and the null is formed in the incident direction of the interference signal. The array antenna can selectively receive signals by adjusting the weight coefficients on each antenna element, so the array antenna is called a "smart antenna". [0003] In the actual work of the array antenna, there are often various errors and non-ideal factors unavoidably, mainly including the direction of arrival error of the steering vector, the estimation error of the covariance...

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Problems solved by technology

[0009] In view of the deficiencies of the prior art above, the purpose of the present invention is to provide a robust beamforming method and system based on iterative correction of the steering vector, aiming at solving the problem of the wave of the steering vector generated in the actual work of the array antenna in the prior art. Errors in the direction of arrival, the estimated error of the covariance matrix of the received signal caused by the limited number of snapshots, the error of the response of the array element, the error of the channel amplitude and phase, and the error of the array correction will cause the actual array manifold to be inconsistent with its ideal value, resulting in beam distortion. Severe performance degradation of former output SINR

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