Comparison and Analysis of Two Calculation Methods of Space Time Covariance Matrix for Reverberation

Calculation of covariance matrix is a basis for space time adaptive processing(STAP). Two methods for cal-culating reverberation covariance matrix, the steering vector synthesis method adapting to theoretical analysis and the direct array data domain method adapting to engineering, are discussed in this paper. The principles and applications of the two methods are analyzed, and their calculation differences in the form, eigenvalue, power spectrum and improve-ment factor of reverberation covariance matrix are compared. Simulation results illustrate that the two methods are ob-viously different, and the direct array data domain method lays the more exact theoretical foundation for its application to STAP.