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针对直升机的雷达散射截面(Radar cross section,RCS)的计算特点,将物理光学法和等效电磁流法相结合,建立了一套基于“面元-边缘”的分析方法。在该方法中,首先对复杂目标(如直升机)进行几何建模和网格划分,然后通过转换程序,获取目标的拓扑结构数据文件;其次在考虑遮挡影响下,分别进行目标表面散射场和边缘绕射场的计算;最后叠加获得总的散射场。在通过球板组合和某外形结构复杂的导弹算例验证本文分析方法有效性的基础上,对某直升机分别沿方位角、俯仰角和滚转角三个方向的RCS进行了计算和分析,并研究了挂架、导弹对直升机整体RCS的影响,获得了一些减缩直升机RCS的外形设计方案。
According to the computational characteristics of RCS of helicopter, a set of analysis methods based on “bin-edge ” was established by combining physical optics method and equivalent electromagnetic flow method. In this method, the geometric modeling and meshing of complex targets (such as helicopters) are firstly performed and then the target topological data files are obtained by converting programs. Secondly, under the influence of occlusion, the target surface scattering field and the edge Diffraction field calculation; the final superposition to obtain the total scattering field. Based on the ball-plate combination and some missile structure with complex structure, this paper analyzes the validity of the method and calculates and analyzes the RCS of a helicopter in three directions of azimuth, pitch angle and roll angle respectively. The impact of the pylons and missiles on the overall RCS of the helicopters, obtained some RCS profile design schemes of the helicopter.