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本文应用物理光学近似,针对NURBS曲面建模技术,提出一种电大尺寸导体目标单站雷达散射截面的计算方法。B样条基函数用多项式表示。非均匀有理B样条曲面可以用等参线划分为若干分片连接的多项式参数曲面片。使用一种改进的Ludwig积分方法,可以在每个多项式参数曲面片的参数域上计算物理光学积分。目标散射总场可由每个曲面片各自的散射场叠加得到。数值计算实例验证了本文提出的方法的有效性。
In this paper, using the physical optics approximation, aiming at the NURBS surface modeling technology, a method of calculating the target single-station radar cross section of a large electric conductor is proposed. B-spline basis functions are expressed in polynomials. The non-uniform rational B-spline surface can be divided into several patch-connected polynomial parametric patches using isoparametric curve. Using an improved Ludwig integral method, the physical optical integral can be calculated on the parameter domain of each polynomial parametric patch. The target scattering total field can be obtained by superposing the respective scattering fields of each patch. Numerical examples verify the effectiveness of the proposed method.