ABSTRACT
In this chapter, the authors present the fundamental aspects of inverse scattering problems with particular attention to the through-the-wall radar imaging framework. Depending on utilization, architecture, and the region of the world, one encounters different wall types with different materials, constructions, and wall thicknesses. Homogeneous walls can be modeled as a slab, and the transmission through it is only dependent on the complex dielectric constant of the material, which is usually frequency dependent, and on the thickness of the wall. Walls are considered inhomogeneous if the dielectric properties of the composing materials differ as a function of position, or if they are made up of different materials with different dielectric and conductive properties. The authors also present the development and implementation of strategies based on imaging approaches for multi-array imaging of the inside of buildings, and/or to perform change detection/ imaging of slowly moving targets.
