An Improved Doppler Radar Imaging Model for Retrieving Ocean Current Velocity from SAR Image under DCA Framework

In this paper, an improved Doppler radar imaging model (IDopRIM) is proposed by considering all three radar imaging modulation transfer functions and implementing a modified hydrodynamic model. The proposed model is validated by comparing to the measurements and the widely-used empirical model. It is indicated that the IDopRIM effectively addresses the overestimation issue of the original DopRIM model and presents a significant accuracy improvement. For most conditions, the root mean square (RMS) errors of the proposed model are within 0.3 m/s.