本文用随机分布的有限长多层介质圆柱模拟树干层,用互易原理得到了位于粗糙地面上有限长多层介质圆柱与球目标的二阶散射场近似解析表达式.在L、C、X波段下,研究了位于此环境中金属球目标与周围树干相互作用的电磁散射,计算结果表明,在低频段时树干对目标影响大,低频段可以穿透植被层并应用于目标探测和识别.

The finite-length multi-layer dielectric cylinder is used to model the trunk.The electromagnetic scattering model for adjacent trunks and sphere above a rough surface ground plane is analyzed by using the reciprocity theorem.The validity of the method is checked by numerical computations based on the moment method.The influence of randomly distributed trunk on the scattering pattern of sphere is discussed at L,C and X bands.It is shown that the low frequency can be used for the purpose of target detection buried in a discrete random media.