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Highly efficient CMP surveying with ground-penetrating radar utilising real-time kinematic GPS  

Onishi Kyosuke (Department of Geosystem Engineering, the University of Tokyo)
Yokota Toshiyuki (Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology(AIST))
Maekawa Satoshi (OYO Corporation, Tsukuba Technical Research and Development Center)
Toshioka Tetsuma (OYO Corporation, Tsukuba Technical Research and Development Center)
Rokugawa Shuichi (Department of Geosystem Engineering, the University of Tokyo)
Publication Information
Geophysics and Geophysical Exploration / v.8, no.1, 2005 , pp. 59-66 More about this Journal
Abstract
The main purpose of this paper is to describe a highly efficient common mid-point (CMP) data acquisition method for ground-penetrating radar (GPR) surveying, which is intended to widen the application of GPR. The most important innovation to increase the efficiency of CMP data acquisition is continuous monitoring of the GPR antenna positions, using a real-time kinematic Global Positioning System (RTK-GPS). Survey time efficiency is improved because the automatic antenna locating system that we propose frees us from the most time-consuming process-deployment of the antenna at specified positions. Numerical experiments predicted that the data density and the CMP fold would be increased by the increased efficiency of data acquisition, which results in improved signal-to-noise ratios in the resulting data. A field experiment confirmed this hypothesis. The proposed method makes GPR surveys using CMP method more practical and popular. Furthermore, the method has the potential to supply detailed groundwater information. This is because we can convert the spatially dense dielectric constant distribution, obtained by using the CMP method we describe, into a dense physical value distribution that is closely related to such groundwater properties as water saturation.
Keywords
common mid-point; ground-penetrating radar; global positioning systems; real-time kinematics;
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