摘要
海洋内波通常在海面之下传播,并通过波流相互作用影响海洋表面毛细波的分布,在合成孔径雷达(SAR)图像中表现为亮暗相间的纹理。该文首先基于Korteweg-de Vries(Kd V)方程,建立内波传播模型;通过波流相互作用函数,基于波作用量方程,对表面毛细波的波谱进行修正;最后基于双尺度方法的面元模型,将内波对高频谱的修正作用考虑在内,计算内波的存在对大尺寸海面电磁散射特性的影响。文中计算了内波存在时海面散射系数分布,分析了不同的内波参数,不同海况参数等对海面散射系数和多普勒的影响。
The internal wave travels beneath the sea surface and modulate the roughness of the sea surface through the wave-current interaction. This makes some dark and bright bands can be observed in the Synthetic Aperture Radar （SAR） images. In this paper, we first establish the profile of the internal wave based on the KdV equations; then, the action balance equation and the wave-current interaction source function are used to modify the sea spectrum; finally, the two-scale theory based facet model is combined with the modified sea spectrum to calculate the scattering characteristics of the sea. We have simulated the scattering coefficient distribution of the sea with an internal wave traveling through. The influence on the scattering coefficients and the Doppler spectra under different internal wave parameters and sea state parameters are analyzed.
出处
《雷达学报（中英文）》
CSCD
2015年第3期326-333,共8页
Journal of Radars
基金
自然科学基金杰出青年科学基金(61225002)
中央高校业务费资助课题
关键词
海洋内波
电磁散射
多普勒谱
Internal wave
Electromagnetic scattering
Doppler spectrum
