RF hardware design of a stepped frequency continuous wave ground penetrating radar

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dc.contributor.advisorInggs, Michaelen_ZA
dc.contributor.authorKabutz, Marten Herberten_ZA
dc.date.accessioned2016-03-28T14:23:00Z
dc.date.available2016-03-28T14:23:00Z
dc.date.issued1995en_ZA
dc.descriptionBibliography: pages 86-88.en_ZA
dc.description.abstractResearch into stepped frequency continuous wave ground penetrating radar (SFCW GPR) at UCT has been carried out since 1990. A first generation system comprising of Hewlett-Packard test equipment controlled by a PC was assembled. Cavity-backed log spiral antennas were designed and built by the University of Stellenbosch for the specific use of ground penetrating radar. Measurements with the first generation system proved the concept of SFCW GPR and thus a dedicated second generation system was planned. A SFCW GPR system was designed to replace the first generation system. Various designs for transmitter and receiver configurations were investigated and those found most suitable were used for the implementation. The SFCW radar consists of a wideband CW transmitter and a coherent receiver. A 300-1000 MHz transmitter was constructed using varactor-tuned oscillators as frequency sources. A double-sideband, low-IF receiver was constructed for the 300- 1000 MHz signal, to mix it to an IF of 10.7 MHz and I-Q demodulate it. The transmitter was found to operate according to specifications. The receiver was found to operate satisfactorily, but the dynamic range was less than expected. A limiting problem encountered in the first generation GPR was the large direct coupling signal from the transmitter into the receiver. This large signal reduced the effective receiver dynamic range. A method of cancelling this large direct coupling signal was implemented, using a bi-phase modulator to generate the cancelling signal in antiphase to the coupling signal. A 20 dB reduction in coupling was shown. The system was used to measure cable lengths to within the inherent accuracy of the system. A metal plate target was detected by the system feeding two antenna and a concrete floor was detected under 1 m of sand. It was thus shown that the SFCW system could be used as a second generation GPR.en_ZA
dc.identifier.apacitationKabutz, M. H. (1995). <i>RF hardware design of a stepped frequency continuous wave ground penetrating radar</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/18227en_ZA
dc.identifier.chicagocitationKabutz, Marten Herbert. <i>"RF hardware design of a stepped frequency continuous wave ground penetrating radar."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1995. http://hdl.handle.net/11427/18227en_ZA
dc.identifier.citationKabutz, M. 1995. RF hardware design of a stepped frequency continuous wave ground penetrating radar. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Kabutz, Marten Herbert AB - Research into stepped frequency continuous wave ground penetrating radar (SFCW GPR) at UCT has been carried out since 1990. A first generation system comprising of Hewlett-Packard test equipment controlled by a PC was assembled. Cavity-backed log spiral antennas were designed and built by the University of Stellenbosch for the specific use of ground penetrating radar. Measurements with the first generation system proved the concept of SFCW GPR and thus a dedicated second generation system was planned. A SFCW GPR system was designed to replace the first generation system. Various designs for transmitter and receiver configurations were investigated and those found most suitable were used for the implementation. The SFCW radar consists of a wideband CW transmitter and a coherent receiver. A 300-1000 MHz transmitter was constructed using varactor-tuned oscillators as frequency sources. A double-sideband, low-IF receiver was constructed for the 300- 1000 MHz signal, to mix it to an IF of 10.7 MHz and I-Q demodulate it. The transmitter was found to operate according to specifications. The receiver was found to operate satisfactorily, but the dynamic range was less than expected. A limiting problem encountered in the first generation GPR was the large direct coupling signal from the transmitter into the receiver. This large signal reduced the effective receiver dynamic range. A method of cancelling this large direct coupling signal was implemented, using a bi-phase modulator to generate the cancelling signal in antiphase to the coupling signal. A 20 dB reduction in coupling was shown. The system was used to measure cable lengths to within the inherent accuracy of the system. A metal plate target was detected by the system feeding two antenna and a concrete floor was detected under 1 m of sand. It was thus shown that the SFCW system could be used as a second generation GPR. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - RF hardware design of a stepped frequency continuous wave ground penetrating radar TI - RF hardware design of a stepped frequency continuous wave ground penetrating radar UR - http://hdl.handle.net/11427/18227 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18227
dc.identifier.vancouvercitationKabutz MH. RF hardware design of a stepped frequency continuous wave ground penetrating radar. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18227en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleRF hardware design of a stepped frequency continuous wave ground penetrating radaren_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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