Recent nonlinear inversion methods and measurement system for microwave imaging

The paper reviews different inversion methods in connection with different measurement systems to solve nonlinear inverse scattering problems for various applications where the discrepancy between the measured and computed scattered field is minimized at each step of an iterative procedure. First, the reconstruction of the complex permittivity profile (permittivity and conductivity profiles) of inhomogeneous buried objects using polarization diversity (TM, TE and cascaded TE-TM polarizations) is considered for nondestructive testing, geophysical, civil engineering, or humanitarian applications. Second, a boundary-oriented method based on contour deformations is exposed for reconstructing the shape of metallic objects for radar imaging purposes.