Analysis of sea clutter in distributed shipborne OTH radar

In distributed shipborne high frequency (HF) surface wave over-the-horizon radar (DS-OTHR) system, the movement of radar can make the system more complex. In this paper, we analyze the geometrical change of the distributed shipborne system with the T-Rⁿ mechanism and its effect to the echoes of target and sea. Then we discuss the method to get the range and velocity of target in this dynamic system, make a detailed analysis on the broadening spectrum of first-order sea clutter. Moreover, we study the space-time distribution characteristics of first-order sea clutter and research the azimuth difference of the target and sea clutter with the same Doppler frequency. Finally, simulation proves the correctness of the analysis of the first-order sea clutter in this system.