A simple method to determine permittivity and attenuation coefficient of media by holographic radar

摘要

Permittivity and attenuation coefficient have an important role in a GPR survey. These are used as the key properties. The general values of these properties are fundamentally well known, however the values usually vary site by site, and accurate values are sometimes necessary for proper analysis. There is a characteristic phenomenon called the “zebra effect” in holographic radar images from the “Rascan” system. The zebra effect is expressed as continuous black and white stripes on a radar image produced by scanning over a slanting flat reflector. This study describes a method to determine permittivity and attenuation coefficient from the zebra effect stripes, with the method applied to various materials. While there is a slight ambiguity in determining exact values, it is a simple method, easily performed on-site, that can provide material property estimates for specific localities.