A holographic reconstruction method for circular multistatic subsurface radar

In recent years, the use of Subsurface Radar (SR) has been proposed for some emerging applications such as breast imaging and wood inspection. A circular scan geometry is usually used in these applications to better suit the morphology of the scan region. Nevertheless, the reconstruction of these kind of datasets is a non-trivial task due to the nature of the phase wrappings introduced by the scan geometry and the near field distances between the antenna and the targets. In this paper, a novel reconstruction algorithm for multistatic SR datasets recorded along cylindrical scan geometries is proposed. This image formation approach performs a series of operations in the frequency domain to compensate the effects of the scan geometry. The performance of the proposed method was evaluated using a series of simulated datasets. Compared with its monostatic counterpart, the proposed reconstruction algorithm generated images with a higher signal to noise ratio, spatial accuracy and focal quality.