A Robust Beamforming Method Based on Interference Signal Steering Vector Estimation

Abstract

This invention discloses a robust beamforming method based on interference signal steering vector estimation, comprising: determining a projection matrix of the signal subspace based on the sample covariance matrix of the echo signal; determining a projection matrix of the interference subspace based on the covariance matrix of the interference signal; projecting the hypothetical interference signal steering vector multiple times onto the signal subspace and the interference subspace using the projection matrices of the signal subspace and the interference subspace respectively, to obtain a final projected steering vector; estimating the estimated steering vector of the interference signal based on the final projected steering vector; and forming a robust beam based on the estimated steering vector of the interference signal. According to the method provided by this invention, by projecting the hypothetical interference signal steering vector multiple times onto the signal subspace and the interference subspace respectively, the influence of array correction errors such as array position errors and array structure errors, as well as array element amplitude and phase errors, on beamforming performance can be effectively reduced, achieving robust beamforming.

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