The moment method is used to calculate the rcs of three - dimensional targets in this paper . these targets include conducting targets , dielectric targets and coat targets . triangular patches are used to model the surface of the target , then electric field integral equation ( efie ) and magnetic field integral equation ( mfie ) are built which satisfy the boundary conditions . the rwg vector base functions are used to denote equivalent electric current and magnetic current on the surface of the target . finally use the galerkin method ( rwg vector base functions are basis function and test function ) to transform integral equations into matrix equation . when obtain the equivalent electric current and magnetic current , we can calculate the scattering field and the rcs of the target 本文利用矩量法計(jì)算了三維導(dǎo)體目標(biāo)、介質(zhì)目標(biāo)、涂層目標(biāo)的雷達(dá)散射截面。首先采用三角形面元對(duì)物體表面幾何形狀進(jìn)行模擬,然后建立滿足邊界條件的電場(chǎng)積分方程( efie )和磁場(chǎng)積分方程( mfie ) ,將物體表面的等效電磁流用rwg矢量基函數(shù)表示,最后利用伽略金法( rwg矢量基函數(shù)既作為基函數(shù)又作為檢驗(yàn)函數(shù))將電磁場(chǎng)積分方程轉(zhuǎn)化為矩陣方程求解未知電磁流系數(shù),得到了表面的等效電磁流后,可以計(jì)算散射場(chǎng)和目標(biāo)的雷達(dá)散射截面。