电流步进法实现低频区RCS可视化计算

基于电流步进法的原理,导出了求解任意理想导体目标在照明区及阴影区感应电流佘式,弥补了物理光学在计算目标阴影面的精确电流的不足。通过对目标表面按照入射雷达波波长进行剖分,可获得散射体表面在离散表示式,利用此感应电流的离散方程组,在入射电磁波方向前向/后向反复迭代,可得到积分电流的唯一值,通过Stratton-Chu积分公式,可得到飞行目标雷达散射截面积(RCS),该方法收敛迅速,适合低频复杂目标计算。计算结果与试验结果吻合良好。

Visual computation of radar cross section in low frequency region by the method of current marching technique

According to the method of current marching technique(CMT) genera l expressions of induced currents for perfectly conducting arbitrary shape's objects are derived. The shortcoming of physical optics(PO) in calculating the currents in the parts of the objects which can' t be illuminated by the electromagnetic wave is offsetted. By subdividing the target's surface which is measured by the wavelengh of incident radar, equations of discrete induced currents of fly object are obtained. After solving the matrix equations in the direction of incident wave forwards and backwards iteratively, the exact result of integral equation for induced currents are available. By making use of the integral formula of Stratton-Chu, the trnget's radar cross section is achieved. Since the convergence of this method is very fast, it is successful to handle the scattering problem of the complex objects in low frequency region. Excellent agreement with the measured data indicates that the method has practical value.