A New DOA Estimation Approach for Weak Signals in Presence of Strong Signals
Yan Fe · Jisuanji fangzhen · 2014
For the problem of the direction of arrival estimation of the weak signals in the presence of the strong signals,a new DOA estimation approach for weak signals was proposed.First,the subspace of strong signals were estimated through the eigenvalues' gradient change of the covariance matrix,then the traditional noise subspace was extended by adding in the orthogonal subspace of strong signals.A new steering vector was constructed,then the MUSIC algorithm was applied,and the DOA of weak signals were obtained.The approach does not need the numbers and the DOA of strong signals,attenuates the peaks of strong signals in spatial spectrum by extending the noise subspace,and has better performance of strong and weak signals resolution.Computer simulation demonstrates its effectiveness and feasibility.