Analysis of the Emitted Wavelet of High-Resolution Bowtie GPR Antennas

Sensors

Fernando I. Rial¹  Henrique Lorenzo²  Manuel Pereira² 

[1] id="af1-sensors-09-04230">Natural Resources & Environmental Engineering, EUET Forestal, University of Vigo, Campus A Xunqueira s/n. 36005 Pontevedra, Spa

关键词: bow-tie antenna;    source wavelet;    time and frequency analysis;    time zero;   

DOI  :  10.3390/s90604230

来源: mdpi

【 摘 要 】

Most Ground Penetrating Radars (GPR) cover a wide frequency range by emitting very short time wavelets. In this work, we study in detail the wavelet emitted by two bowtie GPR antennas with nominal frequencies of 800 MHz and 1 GHz. Knowledge of this emitted wavelet allows us to extract as much information as possible from recorded signals, using advanced processing techniques and computer simulations. Following previously published methodology used by Rial et al. [1], which ensures system stability and reliability in data acquisition, a thorough analysis of the wavelet in both time and frequency domain is performed. Most of tests were carried out with air as propagation medium, allowing a proper analysis of the geometrical attenuation factor. Furthermore, we attempt to determine, for each antenna, a time zero in the records to allow us to correctly assign a position to the reflectors detected by the radar. Obtained results indicate that the time zero is not a constant value for the evaluated antennas, but instead depends on the characteristics of the material in contact with the antenna.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.