A new method of eliminating spurious spectral peak based on array rotation

When suing the multiple signal classification (MUSIC) direction finding algorithm based on uniform linear array, the estimation of the real arrival direction may be interfered due to the occurrence of the spurious spectral peak if the ratio of the element spacing to wavelength is more than 0.5. The available methods of eliminating spurious spectral peak are mainly suitable for active direction finding and non-uniform array. However, passive direction finding and uniform array are preferred in practical application. Aiming at this issue, by analyzing the causes of spurious spectral peaks, a novel method using mechanical rotating (array rotating method) to eliminate spurious spectral peaks is proposed in this paper. And the effectiveness is shown by simulation results. The new method can be easily implemented and widely applied, and can meet real engineering design requirements.