Estimation of sea clutter inherent Doppler spectrum from shipborne S-band radar sea echo
Zhang Jin-Peng1, 2, †, Zhang Yu-Shi1, Xu Xin-Yu1, Li Qing-Liang1, Wu Jia-Ji2
       

Range–Doppler maps of sea clutter in the South China Sea in (a) upwave, (b) downwave, and (c) crosswave directions.