Time-domain method for shape reconstruction of a target with known electrical properties

This paper uses a method for shape reconstruction of a 2-D homogeneous object with arbitrary geometry and known electrical properties. In the method, the object is illuminated by a Gaussian pulse modulated with sinusoidal carrier plane wave and the time domain footprint signal due to the object presence is used for the shape reconstruction. A nonlinear feedback loop is used to minimize the difference between the measured signal and the calculated signal obtained by using FDTD at consecutive time windows. The layers of the object shape are reconstructed while the incident plane wave moves over the object surface. Based on the presented method, some results are presented for an object with typical geometry. And the effect of modulating carrier frequency was investigated for conductor and dielectric objects.