GPR Full Waveform Sensitivity Analysis using a FDTD Adjoint Method

Coarse structures involving low electrical contrasts can be profitably imaged by means of cheap and relatively simple methods such as travel time tomography, whereas fine structure involving sub-wavelength detail can only be recovered by inverting full-waveform data. Despite its complexity and high computation costs, full-waveform inversion of GPR data has become a popular tool for high-resolution imaging in engineering and environmental investigations. Most waveform inversion algorithms are based on gradient methods that are less expensive than Gauss-Newton and full-Newton approaches because they do not require the inversion of large matrices in the updating process.