Abstract
When GPR is detecting unknown objects underground, different antenna working frequency, different antenna size and different antenna internal structure will affect the final data quality and ultimately affect the detection accuracy of GPR. Therefore, when actualizing and evaluating the uwb signal of GPR electromagnetic wave, the electromagnetic properties of underground medium should be fully considered, and the influence of relevant parameters of GPR antenna on the transmitted and received electromagnetic signals should be analyzed by using numerical analysis method. This paper mainly describes the design characteristics of GPR antenna and antenna array, as well as the types, characteristics and application convenience of antenna array under different positioning purposes of GPR.
Highlights
The use of ground penetrating radar (GPR) for underground detection is a commonly used geophysical method, this method uses electromagnetic pulse signals to map abnormal objects or cavities in the soil, the frequency of electromagnetic waves used is generally between tens of megahertz to several gigahertz
For GPR detection, it is very important to select the appropriate frequency band, it can usually be selected according to the requirements of detection resolution and the depth of underground abnormal objects
The basic principle of GPR detection is the classic radiolocation theory, but compared with general sounding radars, the high-frequency electromagnetic waves emitted by GPR propagate in lossy media, there is a large dielectric loss
Summary
The use of ground penetrating radar (GPR) for underground detection is a commonly used geophysical method, this method uses electromagnetic pulse signals to map abnormal objects or cavities in the soil, the frequency of electromagnetic waves used is generally between tens of megahertz to several gigahertz. For GPR detection, it is very important to select the appropriate frequency band, it can usually be selected according to the requirements of detection resolution and the depth of underground abnormal objects. The basic principle of GPR detection is the classic radiolocation theory, but compared with general sounding radars, the high-frequency electromagnetic waves emitted by GPR propagate in lossy media, there is a large dielectric loss. In order to obtain a better resolution within a predetermined depth range, the GPR antenna should have a wider frequency band, a higher amplification factor, and the antenna structure should be compact and suitable. It is best to be carried by a single person, so the ground Radars often use ultra-wideband antennas
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