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提出一种基于电磁等效原理的一组积分方程，应用变分方法和傅立叶变换理论，得到了时域散射场与目标电磁参数之间非线性关系的频域表示式，即反演自由空间中二维电磁目标的时域非线性迭代方法的反演方程。列举了一些典型的数值反演实例，对反演性能进行了多方面的考察，指出本法是一种具有良好反演性能的时域非线性反演方法。
A set of integral equations based on the principle of electromagnetic equivalence is proposed. By applying the variational method and the Fourier transform theory, the frequency domain representation of the nonlinear relationship between the time-domain scattering field and the target electromagnetic parameter is obtained, that is, Inverse Equation of Time Domain Nonlinear Iterative Method for Two Dimensional Electromagnetic Targets. A few typical numerical inversion examples are given, and the inversion performance is investigated in many aspects. It is pointed out that this method is a time domain non-linear inversion method with good inversion performance.