飞行器结构缝隙电磁散射问题的研究

Research on Electromagnetic Scattering for Aircraft Structural Slot

提出了求解飞行器表面结构缝隙电磁散射的方法．由场等效原理及场连续条件，运用矩量法解关于缝隙口面上等效磁流为未知数的方程，由此得到长直缝隙口面上的等效磁流的数学模型．基于上述理论，由座舱结构缝隙建立无限大导电曲屏面上缝隙的数学模型，将曲屏面上缝隙合理划分成若干个近似的直缝隙，求解每一段直缝隙的等效磁流，由辐射积分方程求解该等效磁流的散射场，由这些散射场的叠加得到曲屏面上缝隙的散射场．最后给出某飞行器座舱结构缝隙的雷达散射截面．

An analytic method of computing EM scattering fields for aircraft structural slots is presented.Based on the field equivalence theorem and the continuity of the tangential magnetic field,the equivalent magnetic current of the slot in a perfectly conducting plane is solved by using the method of moments.The mathematics model of slot in a infinitely conducting surface is obtained by studying the characteristics of slots on cabin.The slot is divided into several small parts,and each part is small enough to be considered as a straight slot on conducting plane,then the magnetic current of each small slot is obtained and the scattering field of which can be solved by radiation integral equation,the result can be got by adding all the field vectors together.A practical example of the RCS of the structural slots in some kind of the aircraft is given.