A novel direction-finding method for cyclostationary signals

We develop a method based on the phase-SCORE algorithm of Agee et al. (Proc . IEEE 78 (April 1990) 753) to achieve direction finding for cyclostationar y signals. Using the weight obtained from the phase-SCORE algorithm, we con struct a subspace orthogonal to the subspace spanned by the direction vecto rs of uncorrelated signals of interest (SOIs). Finding the directions of th e uncorrelated SOIs is then performed according to a subspace-fitting conce pt. For coping with the coherence between SOIs, we incorporate the proposed method with the well-known spatial smoothing algorithm of Shan et al. (IEE E Trans. Acoust. Speech Signal Process ASSP-33 (August 1985) 806) to allevi ate the performance degradation due to coherence. Simulation examples for i llustration and comparison are also provided. (C) 2001 Elsevier Science B.V . All rights reserved.