中国物理B ›› 2016, Vol. 25 ›› Issue (7): 74102-074102.doi: 10.1088/1674-1056/25/7/074102
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Tao Xie(谢涛), William Perrie, Shang-Zhuo Zhao(赵尚卓), He Fang(方贺), Wen-Jin Yu(于文金), Yi-Jun He(何宜军)
Tao Xie(谢涛)1,2, William Perrie3, Shang-Zhuo Zhao(赵尚卓)1,2, He Fang(方贺)1,2, Wen-Jin Yu(于文金)1,2, Yi-Jun He(何宜军)1,2
摘要:
Sea surface current has a significant influence on electromagnetic (EM) backscattering signals and may constitute a dominant synthetic aperture radar (SAR) imaging mechanism. An effective EM backscattering model for a one-dimensional drifting fractal sea surface is presented in this paper. This model is used to simulate EM backscattering signals from the drifting sea surface. Numerical results show that ocean currents have a significant influence on EM backscattering signals from the sea surface. The normalized radar cross section (NRCS) discrepancies between the model for a coupled wave-current fractal sea surface and the model for an uncoupled fractal sea surface increase with the increase of incidence angle, as well as with increasing ocean currents. Ocean currents that are parallel to the direction of the wave can weaken the EM backscattering signal intensity, while the EM backscattering signal is intensified by ocean currents propagating oppositely to the wave direction. The model presented in this paper can be used to study the SAR imaging mechanism for a drifting sea surface.
中图分类号: (Electromagnetic wave propagation; radiowave propagation)