A Method of DOA Stepped Estimation Based on Difference and Oblique Projector
Kai Wang · Modern Radar · 2009
A DOA estimation method is proposed for uncorrelated,correlated and coherent sources coexisting in colored noise background.The uncorrelated and correlated sources are first estimated using coventional spatial spectrum estimation methods,then the noise and uncorrelated sources which have Toeplitz structure are eliminated with differencing.Finally,by exploiting the property of oblique projection,the contributions of correlated sources are eliminated from the covariance matrix and only the coherent sources remain.So the coherent sources can be estimated by the technique of modified spatial smoothing.The number of sources obtained by this approach can exceed the number of array elements,thus avoiding repeatedly estimation of correlated sources.Simulation results demonstrate the effectiveness and efficiency of our proposed methods.