Modulation techniques for GPR system radargram
Ground Penetrating Radar (GPR) system ability to detect embedded object underground is dependent on the ultra-wideband antenna use. Based on this antenna type, the fractional bandwidth used by the GPR system is usually greater or equal to 1. On the other hand, the GPR system using fractional band...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/162/1/24p%20ARIFFUDDIN%20BIN%20JORET.pdf http://eprints.uthm.edu.my/162/2/ARIFFUDDIN%20BIN%20JORET%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/162/3/ARIFFUDDIN%20BIN%20JORET%20WATERMARK.pdf http://eprints.uthm.edu.my/162/ |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English English English |
| Summary: | Ground Penetrating Radar (GPR) system ability to detect embedded object
underground is dependent on the ultra-wideband antenna use. Based on this antenna
type, the fractional bandwidth used by the GPR system is usually greater or equal to
1. On the other hand, the GPR system using fractional bandwidth less than 1 will
produce unsmooth GPR radargram, as the consequences of high signal ripples
generated in the system output signals. Based on fractional bandwidth parameter, this
study focuses in developing a digital signal processing of the GPR system to produce
a smooth GPR radargram. The proposed GPR signal processing system is based on
envelope detector technique of Asynchronous Half-Wave (AHW), Asynchronous
Full-Wave (AFW) and Asynchronous Real Square Law (ARSL). The Pulse
Modulation (PM), Stepped Frequency Continuous Wave (SFCW) and Hybrid GPR
system simulation are modeled using CST Studio Suite and MATLAB software. The
selected fractional bandwidth of the GPR system simulation modeled is 0.46 and 0.4
for Microstrip Vivaldi and Horn antennas respectively. In addition, a practical
implementation of the SFCW and Hybrid GPR system using fabricated Microstrip
Vivaldi antenna having a fractional bandwidth of 0.46 and VNA equipment, was
conducted. Based on the analysis results of the proposed PM GPR system simulation,
the AFW technique produces clearer PM GPR radargram. The detection rate for PM
GPR system simulation using AFW technique is 87% and 51.3% using Horn and
Microstrip Vivaldi antennas respectively. Practical implementation of SFCW and
Hybrid GPR systems using AFW technique and Microstrip Vivaldi antenna can detect
an iron and a bottle filled with water object. |
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