一维海面双站电磁散射的二阶小斜率近似研究

摘要

运用二阶小斜率近似方法研究了一维海面TE波和TM波的双站电磁散射。把海面的变化看做是高斯随机过程中的皮尔森-莫斯维茨谱，并且用锥形波入射以减少人为截断误差。给出了用二阶小斜率近似法研究一维海面双站散射的数值模拟结果，并与小斜率近似法和矩量法的数值计算结果进行了比较。结果表明，二阶小斜率近似方法比小斜率近似方法更准确。%In this paper,electromagnetic scattering from one dimensional dielectric sea surface is investigated for both TE and TM polarizations employing the second-order small slope approximation(SSA-II). The second order terms of the small slope approximation method have been numerically implemented in order to obtain accurate results for a large range of slope. The sea surfaces are modeled as realizations of a Gaussian random process with Pierson-Moskowitz spectrum,while the tapered incident wave is chosen to reduce the truncation error. The numerical results obtained by SSA-II are presented by comparison with benchmark numerical method. Results show that the accuracy of SSA-II is better then that of SSA.