Estimation of the Parameters of Cold Unmagnetized Plasma Media Based on Time-Domain Inverse Scattering Technique

In this paper, a time-domain inverse scattering technique for estimating the resonance frequency of 2-D cold un magnetized plasma scatters is proposed. The resonance frequency properties of the unknown plasma region are estimated by post processing scattering-field measurements, which are obtained when the domain of reconstructing region is illuminated by time harmonic source. The plasma scatters parameters are reconstructed by applying a global optimization technique, which combines the finite-difference time-domain (FDTD) method and the particle swarm optimization (PSO) algorithm. During the inversion, the resonance frequency parameters of the unknown region are expanded by a cosine Fourier series. The numerical results illuminate that the proposed method with well reconstruction accuracy and anti ill-posedness characteristics.