DOA Estimation of Currents Based on Toeplitzization With HF Ground Wave Radar

Echoes scattered from ocean waves with the same velocity of flow and in the same range bin are partially correlated in ocean current detection with HF ground wave radar, therefore decorrelation is needed before estimating the direction of arrival (DOA) of ocean currents by MUSIC method. In this paper the conventional MUSIC method is modified by performing a Toeplitzization on the array covariance matrix before implementing MUSIC method. Theoretical analysis and simulation show that this process can reduce the correlation between signals, and can therefore improve the performance of MUSIC remarkably. Finally by analyzing the measured data, it is shown that the improved method can detect the currents more effectively