Doppler Spectra from Bound and Free Gravity-capillary Wave under Different Radar Frequencies
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摘要: 海面上除了存在一种满足频散关系的自由重力毛细波外,还存在一种与主波速度一致的重力毛细波,即受限重力毛细波。该文在受限波与自由波的组合表面模型基础上,针对中等入射角情况下提出一种预测受限波与自由波的多普勒谱宽的理论模型。文章通过数值仿真和水槽微波实验讨论了两者的多普勒谱频移和谱宽随风速和雷达波段的变化情况。Abstract: There exist bound gravity-capillary waves that move at the speed of the dominate waves on the ocean surface, apart from free gravity-capillary waves that satisfy the linear dispersion relation. Based on the Bound\Free wave composite surface model (BF), a theoretical model to predict the Doppler bandwidths of bound and free waves is proposed in this paper. The numerical simulations and microwave experiments in the wind-wave tank are shown in this paper, to discuss their Doppler characteristics of bound and free waves under different wind speeds and radar frequencies.
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