Tree roots detection based on circular survey using GPR

A circular survey using GPR is employed for tree roots detection in field measurement. A new 3D imaging algorithm is also proposed for implementing the 3D reconstruction of the subsurface targets in cylindrical coordinate system. The proposed algorithm can avoid the spatial interpolation of the acquired data between coordinate systems and employs the wave equation extrapolation technique to implement the 3D imaging efficiently. A practical GPR device for the circular survey using 400 MHz bow-tie antenna was developed for the tree root measurement. Finally, the simulated and experimental results confirmed the efficiency of the proposed circular survey and the imaging algorithm for the tree roots detection.