Steering Vector Reconstruction Method for DOA Estimation of Coherent Signal

An effective method is proposed for recovering coherent signals impinging on a uniform linear array and estimating their directions of arrival (DOAs). The spatial signature is blindly estimated from the eigen-decomposition of the covariance matrix, where the steering vectors to all coherent signals are reconstructed directly by using the property of sub-array shift-invariance. When used as the array weighting, the steering vectors will provide recovered signals in corresponding beams. DOAs can be estimated from the angular spectrum subsequently. Results from the real data analysis are in good agreement with theoretical analysis. Our method not only can resolve closely spaced coherent signals, but also is shown to be more robust to system errors compared to some other DOA estimation algorithms.