Due to the importance of the accuracy of the time-domain impedance matrix elements, the techniques by which treating of the singular integrals and near singular integrals arose from the tdie-mom solving process are analyzed in detail, and these techniques are utilized to solve the tdie . in the end, using triangle patches discretizing arbitrarily 3-d dielectric objects and metal-nonmetal composite objects surface and utilizing spatial rwg and temporal triangular bases, the tdie are solved by mot algorithm 最后,分別對(duì)三維介質(zhì)目標(biāo)、金屬非金屬組合目標(biāo)散射體表面用三角貼片離散,并在空間上采用rwg基函數(shù),在時(shí)間上采用三角型時(shí)間基函數(shù)、利用阻抗元素的精確算法計(jì)算出阻抗矩陣,再運(yùn)用mot法分別求解了介質(zhì)體目標(biāo),金屬非金屬組合目標(biāo)的時(shí)域積分方程,并分析了金屬非金屬組合目標(biāo)分界面上的等效電流與等效磁流的特性。