Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar

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dc.contributor.advisorInggs, Michaelen_ZA
dc.contributor.authorCoetzer, Darren Granten_ZA
dc.date.accessioned2014-08-28T14:09:53Z
dc.date.available2014-08-28T14:09:53Z
dc.date.issued2004en_ZA
dc.description.abstractSynthetic aperture radar (SAR) can provide high-resolution images of extensive areas of the earth's surface from a platform operating at long ranges, despite adverse weather conditions or darkness. A local consortium was established to demonstrate a consolidated South African SAR ability to demonstrate to the local and international communities, by generating high quality images with a South African X-band demonstrator. This dissertation forms part of the project. It aims to describe the design and implementation of the transmitter and associated frequency distribution unit (FDU) for the SASAR II, X-band SAR. Although the transmitter and FDU are two separate units, they are ultimately linked. The transmitter has the task of taking a low-power, baseband, chirp waveform and. through a series of mixers, filters and amplifiers, converting it to a high-power, microwave signal. The FDU is essentially the heart of the transceiver and provides drive to all the mixer local oscillator (LO) inputs. It also clocks the DAC and ADC which allow the essentially analogue transceiver to communicate with the digital circuitry. It is found that the chirp signal produced is of satisfactory fidelity. LO feed through, however, is superimposed at the chirps' centre frequency. As a result of previous stages, spurious signals exist at 16 MHz offset from the chirps' centre frequency and at 9142 MHz. The system transfer function reveals that 2 dB roll-off is present at the outer frequencies of the chirp signal. Group delay in the transmitter filters and amplifiers is held responsible for this.en_ZA
dc.identifier.apacitationCoetzer, D. G. (2004). <i>Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/6713en_ZA
dc.identifier.chicagocitationCoetzer, Darren Grant. <i>"Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2004. http://hdl.handle.net/11427/6713en_ZA
dc.identifier.citationCoetzer, D. 2004. Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Coetzer, Darren Grant AB - Synthetic aperture radar (SAR) can provide high-resolution images of extensive areas of the earth's surface from a platform operating at long ranges, despite adverse weather conditions or darkness. A local consortium was established to demonstrate a consolidated South African SAR ability to demonstrate to the local and international communities, by generating high quality images with a South African X-band demonstrator. This dissertation forms part of the project. It aims to describe the design and implementation of the transmitter and associated frequency distribution unit (FDU) for the SASAR II, X-band SAR. Although the transmitter and FDU are two separate units, they are ultimately linked. The transmitter has the task of taking a low-power, baseband, chirp waveform and. through a series of mixers, filters and amplifiers, converting it to a high-power, microwave signal. The FDU is essentially the heart of the transceiver and provides drive to all the mixer local oscillator (LO) inputs. It also clocks the DAC and ADC which allow the essentially analogue transceiver to communicate with the digital circuitry. It is found that the chirp signal produced is of satisfactory fidelity. LO feed through, however, is superimposed at the chirps' centre frequency. As a result of previous stages, spurious signals exist at 16 MHz offset from the chirps' centre frequency and at 9142 MHz. The system transfer function reveals that 2 dB roll-off is present at the outer frequencies of the chirp signal. Group delay in the transmitter filters and amplifiers is held responsible for this. DA - 2004 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar TI - Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar UR - http://hdl.handle.net/11427/6713 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6713
dc.identifier.vancouvercitationCoetzer DG. Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2004 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6713en_ZA
dc.language.isoeng
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.titleDesign and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radaren_ZA
dc.typeThesis
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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