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用有限长多层介质圆柱模拟实际的树干，建立了基于粗糙地面上相邻两树干电磁散射模型。用迭代方法和等效原理，求解了多层介质圆柱的散射矩阵。用互易原理求解了相邻有限长多层介质圆柱包括其二次散射场在内的解析表达式。用矩量法验证了此方法的有效性。考虑地面有一定粗糙度，在Ｌ、Ｃ、Ｘ 等波段，分析了树干表层对其散射特性的影响。
A finite length multilayer cylinder was used to simulate the actual tree trunks and an electromagnetic scattering model based on two adjacent stems on rough terrain was established. The iterative method and equivalent principle are used to solve the scattering matrix of multi-layer dielectric cylinder. The reciprocal principle is used to solve the analytical expression of adjacent finite-length multilayer dielectric cylinders including their secondary scattering fields. The validity of this method is verified by the moment method. Considering the roughness of the ground surface, the effects of the surface layer of the tree trunk on its scattering properties are analyzed in the L, C, X bands.