An improved method for inverse beamforming

In the condition of lower signal-to-noise ratio(SNR), because the main diagonal elements contains more noise than other elements in covariance matrix, the energy difference between the target orientation and others´ is small in spatial spectrum of inverse beam-forming (IBF), and the display effect of spatial spectrum is bad. Withal, this paper suggests that correcting the main diagonal elements of covariance matrix reduces the noise impact on IBF, and enlarges the energy difference between the target orientation and others´, and improves display effect of space spectrum. The numerical simulation shows that the method can improve display effect of space spectrum for inverse beam-forming in lower SNR. The method is simple and effective, and can meet the practical application, and provides a reference for improving time/bearing display effect.