Scattering Mechanism Analysis of Sea Clutter at UHF Band by Doppler Spectrum Characteristics

Using the sea clutter data observed by a coherent UHF band radar which is located on a shore-side platform with a height of 400m, this paper is a detailed research on the characteristics of the Doppler spectrum with different wave height and different intensity returns in a persistent sequence. Based on this, the correspondence analysis of scattering mechanisms in the above diverse conditions is carried out. The results indicate that at middle and low sea states, Bragg scattering is the major scattering mechanism. However, at high sea state, a composite scattering mechanism including white cap, Bragg and weak intensity returns scattering is the dominant scattering mechanism. It has important significance for analyzing properties of electromagnetic scattering and detecting targets at UHF band.