Electromagnetic Modeling of Moving Mixed Conductive and Dielectric BoRs With an Effective Domain Decomposition Method

We propose an effective domain decomposition method with a spherical equivalence surface for the electromagnetic modeling and imaging of moving bodies of revolution (BoRs) from near coupling to far coupling region. The moving BoRs are modeled with a series of stationary moments with respect to the time, each object is enclosed by a spherical equivalence surface. In the near coupling region, the couplings between multiple BoRs are evaluated with the couplings between spherical equivalence surfaces. While in the far coupling region, the total scattering fields are obtained by the superposition of the scattering fields from each spherical equivalence surface. For the moving objects with different relative positions at stationary moments, the equivalence processes are evaluated only once with combined field integral equation (CFIE) and Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) equations for conductive and dielectric objects, respectively. The radar images are obtained from the scattering electromagnetic fields evaluated by the proposed domain decomposition method. Both computation accuracy and efficiency are enhanced significantly. Numerical results and discussions demonstrate the validity of the proposed method for modeling and imaging of mixed conductive and dielectric multiple moving objects.