Summary
International Symposium on Antennas and Propagation
2012
Session Number:2D3
Session:
Number:2D3-3
Accurate Image Expansion Method for Target Buried in Dielectric Medium Using Multi-static UWB Radar
Yoshihiro Niwa, Shouhei Kidera, Tetsuo Kirimoto,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Ultra wideband (UWB) pulse radar holds high dielectric permeability and range resolution, and it is then promising for non-invasive imaging issues, such as a non-destructive testing for pipes buried in soil or concrete wall, or tumor detection in early-stage breast cancer. There are various imaging methods for the near-field UWB radar systems, e.g. synthetic aperture radar (SAR), time reversal focusing [3], or numerical solution for the domain integral equation. However, any above method hardly accomplishes a well balanced performance between an amount of computation and a desired accuracy or spatial resolution. As a solution for this difficulty, we have already proposed a fast and accurate imaging method for targets buried in a dielectric medium based on the advance principle of RPM, which accomplishes accurate surface extraction for targets in free space exploiting the group mapping from the range points to target surface points. As a notable feature of this method, it remarkably enhances the imaging speed without a signal integration approach, and improves the accuracy for target boundary extraction to the order of 1/100 wavelength. However, the method assumes the mono-static configuration, and it often hardly reconstructs the whole part of target boundary, particularly for dielectric medium with random surface. To enhance the imaging area of an internal target, this paper introduces a novel method with multi-static observation, where the principle of the method [6] is appropriately extended to one transmitting and multiple receiving model. This method can enhance an instantaneous aperture size, which make us possible to obtain the reflection echo from wider part of target boundary. The results in Numerical simulation show that the proposed method accurately expands the imaging region of internal target compared to that obtained in the monostatic based method.