Shipborne HFSWR Sea Clutter Suppression Method Based on MultiDomain Information Synergy

Due to the integrated effect of many factors including nonuniform wave motion and shipboard platform motion, the echo signals received by shipborne high-frequency surface wave radar (HFSWR) often suffer from issues such as sea clutter spreading. A large number of targets are submerged by sea clutter, creating a non-detectable zone. To address this problem, a novel sea clutter suppression method based on multidomain information synergy is proposed. The proposed method first identifies the broadening region of sea clutter by its characteristics. The multidomain spectrum is then constructed using a narrow beam forming method. Afterward, the Laplace kernel function is employed to screen the sea clutter regions to obtain the plausible region of interest (PROI). Ultimately, we integrate all PROIs and obtain sea clutter suppression results. Field data from shipborne HFSWR and validation results from the automatic identification system (AIS) demonstrate that the proposed method can effectively suppress sea clutter, increase the signal-to-clutter ratio (SCR), and achieve better target detection performance.