The operating frequency selection in HF hybrid sky-surface wave system

Operating frequency selection of high frequency (HF) hybrid system with a single-pass sky-wave transmitting path and a single-pass surface wave receiving path is presented and analyzed in this paper. Based on the theory of ocean wave energy spectrum, the first and second-order sea clutter scattering cross section equations of biostatic system is introduced and the connection between the sea clutter and operation frequency is simulated. Using the experimental platform of the hybrid system and analyzing the emblematical experimental data, the criterion of frequency selection in favor of sea clutter detection is established.