Pulse Compression Subsurface Radar

Ikuo ARAI  Yoshiyuki TOMIZAWA  Masanobu HIROSE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E83-B   No.9   pp.1930-1937
Publication Date: 2000/09/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Advances in Radar Systems)
Category: 
Keyword: 
subsurface radar,  chirp signal,  limiter,  delay correlation method,  pulse compression,  

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Summary: 
The application of subsurface radar using electromagnetic waves in the VHF band is wide and includes surveying voids under the ground and archaeological prospecting. To achieve a wider application range, the survey depth must be deeper. In this paper, a method of pulse compression using a chirp signal as one of the methods to fulfill this requirement is described, and its advantages and problems are discussed. First, a delay correlation method is proposed as a processing method of pulse compression. It converts RF band chirp signal directly into a pulse. Moreover, the method improves the S/N ratio by over 40 dB compared with conventional pulse radar. Therefore, it has the same detection ability as conventional pulse radar even though it uses less transmitting power. Next, the influences of RF amplifier saturation and underground propagation characteristics on the chirp signal are discussed; both are shown to have little influence on the detection ability of the method.