| High frequency surface wave radar(HFSWR) could be mainly classified as land-based HFSWR and shipborne HFSWR. Compared with the former type, shipborne HFSWR, besides the advantage of all-weather and low-cost, is less vulnerable to be attacked because of the flexibility, and can increase the space of the battle by making full use of the capacity of the shipborn weapon. In the analysis, the discussion about the sea clutter of HFSWR on a shipborne platform is developed from two aspects. One is obtaining the simulated spectrum of the sea clutter through the derivation of the ocean surface radar cross section in the frequency-domain, and the other is obtaining the spectrum and the space-time distribution of the first-order sea clutter, based on the received signal of linear array in the time-domain.First of all, the model developed by Barrick about the first-order and second-order sea clutter of land-based HFSWR is introduced, and the spectrum of the sea clutter is simulated and analyzed according to the derivation of the first-order and second-order ocean wave radar cross section. Moreover, based on the bistatic model of Walsh and Gill, the first-order and second-order ocean wave radar cross section of HFSWR on a floating platform are derived and the spectrum of sea clutter is simulated. Further, compared with the result of the Barrick model and that of the land-based model simplified from the Walsh model, the consistency of the two models will be discussed.Secondly, based on the monostatic blackscatter electric field equation of the omnidirectional vertically polarized pulsed dipole antennas, the first-order cross section of HFSWR on a platform with the uniform linear motion is derived and the spectrum of the first-order sea clutter is simulated. In addition, combining the model of the floating platform and the platform with the uniform linear motion, the first-order cross section of HFSWR on a moving forward platform with the oscillating motions in the transverse axis of the platform is derived and the spectrum of the first-order sea clutter is simulated.Finally, following the analysis of the shipborne platform with six oscillating motions, the effect of the three oscillating motions of the shipborne platform on the received signal of the linear array is discussed. Subsequently, the spectrum and the space-time distribution of the first-order sea clutter of HFSWR on a sway platform and a surge platform are simulated based on the functions of the received signal of the linear array, and then the distribution discipline of the first-order sea clutter of HFSWR on a moving forward platform with three oscillating motions is summarized. |
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