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Micro-Doppler signatures of sea surface targets and applications to radar detection

The micro-motion of a subject induces Doppler frequency modulations around the carrier frequency of the reflected sensor signals. Recently, it has been proved that sea clutter is significantly variable and sea surface subjects have their micro-motions influenced by the sea state. The micro-Doppler (m-D) signatures can describe the refined motion characteristics of sea surface target. The micromotion signal model of sea surface target is established in this paper based on the length of observation time. Finally, the micromotion properties are analyzed using real radar data, i.e., X-band Council for Scientific and Industrial Research (CSIR) data and S-band radar data. It also proves that the m-D can provide extra information of target, which would help improve radar detection and recognition abilities.