Bistatic Scattering Analysis of Vegetation using Fast Hybrid Method of Full Wave Simulations

Bistatic scattering analysis of vegetation is an important element in developing remote sensing applications for microwave measurements. Previously, we applied the hybrid method (HM) to full wave simulations of realistic vegetation geometries. However, HM was limited to solving a relatively small number of scatterers. To accelerate the solving of the Foldy-Lax multiple scattering equations, the fast hybrid method (FHM) was applied to solving a much larger number of corn plants in a vegetation field. The FHM procedure for scattering is described in this paper. A bistatic scattering analysis of 49 corn plants by FHM showed good agreement with FEKO. The CPU time and memory of the FHM required less than 190 seconds and 570 Mbytes, respectively, and the computation can be readily performed on a standard laptop.植被双站散射（bistatic scattering）分析是开发微波遥感测量应用的核心环节之一。此前，我们将混合方法（hybrid method, HM）应用于真实植被几何结构的全波仿真。但该混合方法仅能处理数量相对有限的散射体。为加速Foldy-Lax多散射方程的求解，我们将快速混合方法（fast hybrid method, FHM）应用于植被场中规模更大的玉米植株散射求解。本文详细阐述了面向散射问题的快速混合方法求解流程。通过该方法对49株玉米植株开展的双站散射分析结果，与FEKO仿真结果吻合度极佳。该方法的计算耗时与内存占用分别低于190秒与570兆字节，且可在普通标准笔记本电脑上便捷完成计算。