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用粗糙面上方有目标和无目标时空间散射场的差值计算雷达散射截面,称为差场雷达散射截面.推导了TE波入射时粗糙表面上介质目标表面的感应电流Jo和感应磁流Ko、导体粗糙面上差值感应电流Jsd的积分方程,直接求解散射差场Esd,而无需对有无目标两种情况分别求解.目标表面的积分方程中需要计算目标所在位置处单独由粗糙面贡献的散射场Es0,它主要来自对准目标的镜面方向上的一小段粗糙面的贡献,此时选取的小段粗糙面减小了计算量.提出目标与粗糙面散射差场积分方程互耦迭代的求解方法.由于理想导体粗糙面的强镜面散射特性,在该迭代计算中的粗糙面的长度与观测散射角有关,给出了它们之间的解析关系式,此时选取的粗糙面长度远小于现有的方法,特别适于低掠角问题.结合MonteCarlo法,迭代计算了P-M谱(Pierson-Moskowitz)导体粗糙海面上方不同介质材料的圆柱和方柱目标的差场散射,并与理想导体柱的散射进行比较.讨论了介质目标上感应电流、感应磁流,以及粗糙面上的差值感应电流的分布,目标差场散射的峰值特征等.
The scattering cross section of the radar is calculated by the difference between the target and the non-target space-time scattering field above the rough surface, which is called the cross-section of the differential radar.The induced current Jo and induced magnetic current Ko , And the differential induced current Jsd on the rough surface of the conductor, the scattering differential field Esd can be directly solved without the need of separately solving the two cases with or without the target. In the integral equation of the target surface, it is calculated that the position of the target is solely contributed by the roughness Of scattering field Es0, which mainly comes from the contribution of a short segment of the rough surface in the direction of the mirror’s target, and the selected small segment of the rough surface reduces the amount of calculation. Because of the strong specular scattering of the ideal conductor rough surface, the length of the rough surface in this iterative calculation is related to the observed scattering angle, and the analytic relation between them is given. At this time, the length of the rough surface selected is far less than The existing methods are especially suitable for low sweep angle.Combined with the Monte Carlo method, iteratively calculated the different media materials of the Pierson-Moskowitz conductor above the rough sea surface The differential scattering of the target and the square column is compared with that of the ideal conductor. The distribution of induced current, induced magnetic current and differential induced current on the target are discussed. The peak value of target differential field scattering Features and more.