平板目标与二维粗糙介质分形海面复合电磁散射近场特性研究

Characteristics of Near Field of Composite Electromagnetic Scattering between Plate Target and Two-dimensional Rough Medium Fractal Sea Surface

采用二维连续带限分形函数模拟粗糙海面,研究了与其上方金属平板的近场复合电磁散射,将目标分化为微小面元,依据远场条件,运用 Kirchhoff 近似法导出了复合散射的计算公式,并给出了数值计算结果,进一步将其推至远场,并同远场计算结果进行比较;讨论了复合散射截面随入射角、入射频率及平板尺寸的变化关系。

Rough sea surface is simulated by using two dimensional and continuous band-limited fractal function,the composite electromagnetic scattering of metal plate over it is investigated by dividing the object into minor element.Based on the condition from its remote field,Kirchhoff approximation is used to derive the equation for the composite scattering calculation,and the result of calculation is provided.For the far scatter field,the result is correlated with that of far scatter field,the incident angle,incident frequency and the size of plate of the scattering section are discussed.