随机粗糙面上目标散射差值计算的快速互耦迭代方法

用粗糙面上方有目标和无目标时空间散射场的差值计算的雷达散射截面,称为差场雷达散射截面.本文推导TE波入射下电场积分方程(EFIE),直接求解散射差场.本文提出目标与粗糙面之间的互耦迭代的计算方法,散射场纳入了目标与粗糙面之间复杂的相互作用,给出了迭代过程中纳入的粗糙面长度的选择.用Monte-Carlo方法,计算了P-M谱粗糙海面上方二维圆柱和方柱的散射,说明目标的几何结构对散射方向图的影响.

Fast Iterative Approach to Bistatic Scattering of the Electromagnetic Difference Fields from the Target Above a Randomly Rough Surface

The difference field RCS(d-RCS) has been defined to analyze the scattering from the target above a rough surface.In this paper,the electric field integral equations(EFIE) of the difference induced current on the rough surface and the induced current on the target are derived.An iterative approach is developed to solving the two EFIEs and scattering from both the target and underlying surface.How to choose the illuminated length of the rough surface for numerical iterations is discussed.Using the Monte Carlo method to realize the ocean-like rough surface,bistatic scatterings from the target,e.g.a cylinder or a square column,above a P-M(Pierson-Morkowitz spectrum) rough oceanic surface are numerically simulated for TE tapered wave incidence.Difference bistatic scattering of a square column above rough surface shows multi-peaks in different directions related to the spatial orientation and geometry of the square column.