Recent nonlinear inversion methods and measurement system for microwave imaging
Résumé
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.
Mots clés
- Microwave imaging
- Radar scattering
- Inverse problems
- Polarization
- Image reconstruction
- Geophysics computing
- Permittivity measurement
- Geophysical measurements
- conductivity profile
- electromagnetic wave scattering
- permittivity
- iterative methods
- ultra wideband antennas
- nonlinear inversion method
- measurement system
- iterative procedure
- permittivity profile
- radar imaging
- buried object
- polarization diversity
- nondestructive testing
- boundary-oriented method
- contour deformation
- shape reconstruction
- UWB antenna
- Microwave measurements
- Microwave theory and techniques