Space-Time Distribution of the First-Order Sea Clutter in High Frequency Surface Wave Radar on a Moving Shipborne Platform

The first-order Bragg lines in ship borne high frequency surface wave radar (HFSWR) are spread due to the platform motion, and the space-time distribution of the first-order sea clutter manifests itself as two ideal diagonal lines. However, because of the interaction between platform and sea environment (such as ocean wave, current and wind), the first-order sea clutter spectra are influenced by the three oscillating motions of the ship borne platform, sway, surge and heave. In this paper, the effects of such three motions on the first-order sea clutter and the space-time distribution are investigated based on a uniform linear array consisting of seven omni directional vertically polarized pulsed dipole antennas.