Feasibility of Extracting Sea Surface Current by HF-SAR

To meet the requirements of extracting sea surface current information by a single station, we try to apply the synthetic aperture technique to HF surface wave radar and present the new concept of HF surface wave SAR (HF-SAR), and consider the feasibility of extracting sea surface current by HF-SAR in this paper. First the composition and implementation aspects are described, then the system model and velocity estimation algorithm are designed, and finally the simulation model to extract the surface current is implemented on a single resolution cell. Simulation results show that by properly choosing the size of a resolution cell in azimuth direction, estimating the Doppler centroid and Doppler rate from azimuth echoes, the velocity estimation of the surface current is derived, and the precision is enough to meet the requirements. It indicates that HF-SAR is theoretically feasible to be used in sea surface current extraction