散射辐射组合系统对造波水面的观测研究

Observation of scattering and emission from fluctuating rough surface of water basin by using a combined scatterometer and radiometer system

介绍了新研制的Ｘ波段散射计辐射计组合系统，利用这一组合系统进行同时同地相继观测，得到ｖｖ，ｈｈ，ｈｖ多极化的后向散射系数σ０ｐｑ（ｐ，ｑ＝ｖ，ｈ），ｖ和ｈ极化的辐射亮度温度ＴＢｐ（ｐ＝ｖ，ｈ）。为模拟海面风场驱动起伏海面，利用室内人工造波池，在机械驱动下产生给定波谱的随机性或周期性起伏水面。用该散射计辐射计组合系统观测多角度与多种起伏高度时的σ０ｐｑ－ＴＢｐ。并用双尺度随机粗糙面散射辐射理论模型，数值地模拟计算起伏水面的散射与辐射，与实验结果进行了比较与分析，为海面主被动联合遥感提供了一个室内模拟实例研究。

A system of combined scatterometer and radiometer at the X band is developed at the WSRSC.It is employed to simultaneously observe the polarized back scattering σ vv ,σ hh ,σ vh ,σ hv and brightness temperature T Bv ,T Bh from randomly perturbed, rough surface of the water basin.This water basin was previously constructed for ship engineering experiments.Randomly rough surface of water basin with the Pierson spectrum and different surface height are generated by the mechanical driver.Polarized back scattering σ pq (p,q=v,h) and brightness temperature T Bp ,p=v,h for different incident angles and surface mean heights are measured.It might mimic random sea surface driven by sea surface winds.Functional dependence of σ pq and T Bp upon incidence angle, surface height and other parameters are obtained.Simultaneous observations of active back scattering and passive emission shows correlation of σ pq and T Bp .By using the two scale model of rough surface,numerical simulation of σ pq and T Bp are also discussed comparing with the measurements.