Fast and accurate imaging algorithm for targets buried in dielectric medium for UWB radars

Ultra-wide band (UWB) pulse radar with high range resolution and dielectric permeability is promising as an internal imaging technique for non-destructive testing or breast cancer detection. Various imaging algorithms for UWB radar techniques have been proposed, such as aperture synthesis and the space-time beamforming algorithm. However, these algorithms are based on a signal focusing scheme, which often suffers from insufficient resolution to identify the detailed structure of buried targets and has high computational cost in obtaining a full three-dimensional image. To overcome these difficulties, this paper proposes an accurate fast imaging algorithm for targets buried in a uniform dielectric medium by advancing the RPM(Range Points Migration) algorithm, which has been shown to achieve super-resolution imaging for spatial measurement. Numerical simulation shows that the proposed algorithm achieves imaging accuracy of around 1/20 λ with less computation time by specifying boundary extraction.