Improved RSS method for the direction finding of wideband sources
Yong Jin · Systems engineering and electronics · 2010
In order to reduce the computational complexity and resolution threshold of the conventional rotational signal subspace(RSS) algorithm for wideband signals,the real value transforming process and the SSMUSIC method are introduced for central symmetric arrays to propose a new direction finding method for wideband sources.This method first transforms the complex data covariance matrices after forward-backward smoothing at different frequencies into real ones by a left-real transforming matrix,which achieves a substantial reduction of the computational load in later eigen-decompositions.Then the conventional RSS algorithm is applied to get focusing matrices for different frequencies and these focusing matrices are further used to transform data covariance matrices into ones at a common reference frequency.Finally the direction of sources are obtained by one-dimensional search of the maxima of an improved MUSIC estimator called SSMUSIC.Simulations show that the proposed method reduces not only the computational overhead but also the resolution threshold and MSE noticeably.