用矩量法计算任意形状目标雷达散射截面

 1.引言 在电磁散射计算问题中,过去研究较多的是高频情况,所用方法通常是几何绕射法、光学法等。用矩量法计基电磁散射问题,60年代提出了网格法。这种方法多用于尺寸较小的物体,如线天线、小平板等。l984年美国人用矩量法计算了飞机、导弹等的雷达截

ARBITRARILY SHAPED SCATTERER BY MOMENT METHOD

T'he calculation of RGS for an arbitrarily shaped and perfectly conducting scatterer with small electric size has been studied by moment method.The starting point of this paper is the reaction integral equation(RIE).We use polygonal plates to construct the models of realistic structures and segmemt every plate into modes automatically.Overlap modes can be obtained between the connectiag intersecting plates.The piecewise-sinusoidal modes have teen chosen as expansion and testing functions .From RIE, the matrix equation IZ=V can be derived. Accord-ing to 1,scattering field and RCS of the scatterer can be obtained. The method has advantages of simplicity and flexibility of input ,versatility and accuracy.The calculating results of RCS for a few scatterers with different shapes,including a realistic rocket,have been given.The results are in good agreement with those publishod abroad.