A Novel Subsurface Radar Using a Short Chirp Signal to Expand the Detection Range

Yoshiyuki TOMIZAWA  Masanobu HIROSE  Ikuo ARAI  Kazuo TANABE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E83-B   No.10   pp.2427-2434
Publication Date: 2000/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Sensing
Keyword: 
subsurface radar,  short chirp,  limiter,  delay correlation method,  pulse compression,  

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Summary: 
The use of a chirp signal is one of the methods to expand the detection range in subsurface radar. However, the presence of time-sidelobes after a conventional pulse-compression makes the detection range degraded because weak signals from underground objects are covered with a large time-sidelobe due to a ground surface reflection. In this paper, we propose a new pulse compression subsurface radar using a short chirp signal in which the echoes from the ground surface and the object are not overlapped. We show that the short chirp signal can improve the detection ability compared with a conventional chirp signal and examine the influence that the decreases of the signal duration and the compression ratio exert on the detection range. By the new pulse compression subsurface radar, the steel pipes buried down to 5 m in depth can be detected.