Takashi MIWA received Dr.(Eng.) degrees from the Department of Geoscience and Technology, Faculty of Engineering, Tohoku University, Japan, in 1999. He is currently an associate professor in Div. of Electronics and Informatics, Faculty of Science and Technology, Graduate School of Gunma University, Japan. His research interests include Borehole radar, Ground penetrating radar, Doppler radar, Radar polarimetry, Radar system , Radar signal processing, Super-resolution technique, Non-destructive evaluation, Applied ultrasonic measurement.