PTD和PTDEEC算式的奇异点处理

Treatment of Singularities in PTD and PTDEEC

将计算劈型目标电磁散射的PTD绕射系数通过简单的三角变换写成另一种表达式，提高它们在奇异点邻域的数值稳定性，数值结果表明本文给出的公式在奇异点附近比原始的表达式要好。最后将处理PTD线材系数奇异性的思路和表达式推广到PTDEEC的系数中，使PTDEEC公式适合数值计算。

The diffraction coefficient describing scattering from an edge they in the physical theory of diffraction are reformulated so as to provide stabilized behavior in the neighborhdri of singularities.Numerical results show that as singularities are approached, the reformulated coefficients in this paper are better behavior than the original. The idea and reformulated formulas are extended to the coefficients associated with PTDEEC, an expression for the coefficients of PTDEEC is obtained,which is suitable to numerical computation.