Influence of bistatic shipborne HFSWOTHR platform oscillation on the sea clutter

Under certain sea state, the sea wave will lead to the ship oscillation when the ship is sailing on the sea. The influence that the ship oscillation has on the target echo is usually discarded when simulating the target in shipborne HFSWOTHR. In this paper, the characteristic of ship oscillation is analyzed, including rolling, pitching and yawing. The model of the ship oscillation is set up. The concept of the instantaneous synthetic rotational velocity and angle is introduced and their expression are deduced. Then, the dynamic geometry relation model of bistatic shipborne HFSWOTHR in the condition of the ship oscillation is set up. Computer simulations are carried out for the sea clutter under the condition of the swing and no swing of the ship. At last, the sea clutter spectrums that come from the two conditions of the oscillation and no swing are compared in order to analyse the influence of the oscillation. The study of this paper will improve the simulation of sea clutter in shipborne HFSWR, which makes the simulation more close to reality.