Ocean surface cross sections for shipborne HFSWR with sway motion

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Why is it important?

To interpret the essential characteristics of the sea echo backscattered from theocean surface, the first‐ and second‐order ocean surface cross sections are mathematicallyderived for an omnidirectional receiving sensor in monostatic shipborne high‐frequencysurface wave radar (HFSWR), where the uniform linear motion and sway motion are involvedsimultaneously. The derived cross sections could be reduced to the existing resultsin HFSWR on a floating platform, shipborne HFSWR with uniform linear motion, and evena stationary land‐based HFSWR. The illustrations and discussions are presented basedon the simulated Doppler spectra under different situations. Aside from the Bragglines broadening due to the uniform linear motion and its variation with wind direction,the sway motion generates additional Doppler spectra, which emerge with the uniformspacing of sway frequency. The theoretical derivations and analyses based on simulationsmay be of importance to future investigations and applications, not only in targetdetection but also in ocean remote sensing.