基于物理模型的动态海面电磁仿真方法研究

Physical model based electromagnetic simulation methodology for dynamic ocean surface

针对微波海洋遥感中复杂海面电磁环境难以准确建模的问题,给出了粗糙海面及目标的电磁仿真方法。通过海浪谱模型建立了与实际情况相符的三维海面,设置相应的电磁参数,准确复现海洋环境。采用时域有限差分方法(FDTD),将空间和时间离散化并进行迭代运算,计算动态实时的电磁分布状态。最后通过仿真对海面模型进行验证,并给出了相应的电磁分布状态。结果表明,该方法能够有效实现完整的海洋电磁散射仿真系统。

This paper present an electromagnetic simulation method for sea clutter and targets in view of the difficult accurate modeling of complicated sea surface electromagnetic scenario in microwave ocean remote sensing.We employ a ocean wave spectrum model to reconstruct 3D coarse sea surface,consistent with the actual situation.We can therefore set up the corresponding electromagnetic parameters and recover the real sea environment.We further discretize space and time with FDTD and perform iterative computation.We then calculate the dynamic and realtime electromagnetic distribution.We eventually prove the sea surface model by simulation and present the corresponding electromagnetic distribution status.Simulation experiments show that the method can effectively implement the simulation of a complete eletromagnetic scattering from ocean surface.