Abstract
The underground radar is used as a method for imagining complicated underground structures, such as a stratum and a buried target, with un-destroying and un-contacting. However, in order to find an object from an underground radar image with sufficient accuracy, a lot of experience or knowledge of an expert is necessary. Therefore, various kinds of signal processing have been studied aiming at making an image clear. The key techniques generally used in an underground radar are the synthetic aperture processing and the FFT. The crucial point is as follows. There is an important characteristic that the hyperbola of the received wave form measured by the underground radar varies with the depth of a buried target. Then, the authors propose an underground imaging algorithm for synthetic aperture processing considering the characteristic of the depth-induced change of underground-radar signal image.
