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Modulation of waveheight spectrum and radar cross section by varying surface currents

机译：通过改变表面电流来调制波高谱和雷达横截面

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This paper investigates the validity of the relaxation model which is generally used to describe the modulation of wind-generated ocean waves by slowly varying surface currents, and the applicability of the model to illustrating features observed in the radar images of internal wave wakes. The amplitude and phase modulations in the waveheight spectrum are examined for sinusoidal current variations; these changes are then translated into the radar cross section (RCS) modulation using the Kirchoff scattering theory. The present study concludes that: 1) the relaxation model is valid under intermediate to strong wind conditions and/or weak current signatures, and the conditions for the validity are given; 2) the relaxation model combined with the Kirchoff model could, under certain conditions, explain the differences in amplitude and phase between the P-band and L (C- and X-) band SAR images of ship-generated internal wave wakes observed during the 1989 Loch Linnhe experiment; and 3) the directional dependence of the relaxation rate enhances these differences.
机译：本文研究了松弛模型的有效性，该模型通常用于描述通过缓慢变化的表面流来调制风生海浪，并且该模型适用于说明在内部波尾波的雷达图像中观察到的特征。检查波高频谱中的幅度和相位调制是否存在正弦电流变化；然后使用基尔霍夫散射理论将这些变化转化为雷达截面（RCS）调制。本研究得出以下结论：1）松弛模型在强到中风条件下和/或弱电流特征下有效，并给出了有效性条件； 2）弛豫模型与基尔霍夫模型相结合，可以在一定条件下解释在观测期间观测到的舰船内部波尾的P波段和L（C波段和X波段）SAR图像的幅值和相位差异。 1989年林赫湖实验； 3）弛豫率的方向依赖性加剧了这些差异。

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