蒙特卡罗方法在小麦后向电磁散射中的应用

A Monte-Carlo Method Applied in the EM Backscattering from Wheat

本文运用Ｍｏｎｔｅ—Ｃａｒｌｏ方法对小麦的后向电磁散射问题进行了数值模拟。Ｍｏｎｔｅ—Ｃａｒｌｏ方法把电磁波与植被的相互作用看作是光子与离散散射体的连续碰撞，给碰撞赋予概率意义，以此模拟光子的轨迹。小麦被模化成充满半空间的具有一定空间取向及大小的椭圆盘。数值结果与实验数据吻合较好。

A Monte-Carlo method for simulating the backscattering from wheat is diecussed. For Monte-Carlo method, interactions between electromagnetic wave and vegetation are regarded as photon collisions with discrete scatterers continuously. Photon can be traced in view of collision probability. Wheat is modeled as ehiptical disks with given orientation and size. The numerical results agree well with our experimental ones got in field.