Abstract:

Considering the underdetermined blind separation of radar signals which is non-disjoint in timefrequency domain, a method based on observed signals and the cumulant is proposed for estimating matrix, and then the modified subspace projection is used for recovering radar signal. Firstly, the fourth-order cumulant is constructed based on observed signals and the cumulant is expressed as the third-order tensor, the mixed matrix is estimated by tensor decomposition with enhanced line search alternating least square. Finally, the over-determined matrix, which is calculated by estimating the column vector corresponds to the active original signal at any time-frequency point, is used to complete the estimation of signal by Moore-Penrose. The proposed method can solve the blind separation of non-disjoint radar signals in the time-frequency domain under complex electromagnetic environment. Simulation results show that the proposed method outperforms the existing methods in mixed matrix estimation and source recovery.