Single-Unit Underground Radar Utilizing Zero-Crossed Synthetic Aperture

Yuji NAGASHIMA  Hirotaka YOSHIDA  Jun-ichi MASUDA  Ryosuke ARIOKA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E76-B   No.10   pp.1290-1296
Publication Date: 1993/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Radar Technology)
Category: Subsurface Radar
Keyword: 
underground radar,  synthetic aperture,  pipe detection,  velocity estimation,  

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Summary: 
This paper describes a new single-unit underground radar for detecting underground buried pipes. The pipe depth can be calculated from the hyperbolic shape in the cross-sectional image of radar echoes. The edge contour of the image is extracted, and the buried depth is judged from the similarity between the extracted hyperbolic curve and the theoretical curve. A suitable amplification rate is estimated by choosing the best image from numerous cross-sectional images formed during one antenna movement repeated at different amplification rates. The best image has few pixels corresponding to weak and saturated signals. The new radar is very compact, so it can be operated by one person. Objects buried up to 2.0m deep can be detected.