Thesis (MScEng)--University of Stellenbosch, 2001. / ENGLISH ABSTRACT: The co-existence of electronic devices and their attached transmission cables requires a
careful planning regarding the energy leakage across cable shields. This leakage poses
potential serious problems and impedes system functioning.
This thesis pursues an investigation into the EMC cabling protocols for microsatellite
systems. Network analysis techniques are applied in calibrating current probes and to
recover the cable transfer impedance, Zr. The calibration approach provides accurate
results for frequencies up to 600MHz. The methods used to determine Zr are based on
injecting a disturbance current onto the outside of the cable-under-test (CUT) and
measuring the corresponding voltage induced on the centre conductor. Useful results are
obtained up to 80MHz with the use of a O.5m length of cable. It is thus proposed that Zr
is a practical concept for shielding performance evaluation and for the testing of cable
philosophy. The results are usable in classifying cables for verification and signal usage.
Further research involves a prediction tool called an EMC ITS that simulates the
hardware of a microsatellite system to allow studies on design trade-offs, transmission
cable criteria and placement of devices. / AFRIKAANSE OPSOMMING: Die gelyktydige bestaan van elektroniese toestelle en hul aangehegte
transmissielynkabels benodig deeglike beplanning met betrekking tot die lek van energie
deur die kabels se afskerming. Hierdie lekkassie kan ernstige probleme tot gevolg hê en
die stelsel se funksionering belemmer.
Hierdie tesis loods 'n ondersoek na die EMV bekabelingprotokolle vir mikrosatellietstelsels.
Netwerk analise tegnieke word gebruik in die kalibrasie van stroom-probes en
die verkryging van die kabel se oordragsimpedansie, Zr. Die benadering wat gevolg is in
die kalibrasie verskaf akkurate resultate tot en met frekwensies van 600MHz. Die
metode wat gebruik word om Zr te bepaal is gebaseer op die injeksie van 'n
versteuringstroom op die buitekant van die toetskabel en die meting van die
ooreenstemmende spanning wat opgewek word op die binne-geleier. Bruikbare resultate
is tot en met 80MHz verkry met die gebruik van 'n kabel met 'n lengte van O.Sm. Daar
word dus voorgestel dat Zr 'n praktiese wyse is om afskermingsprestasie mee te evalueer,
asook vir die toetsing van kabel-filosofie. Die resultate is bruikbaar in die klassifikasie
van kabels vir verifikasie en seingebruik.
Verdere navorsing sluit in 'n voorspellingswyse wat 'n EMV GTS genoem word, wat die
hardewaarde van 'n mikrosatellietstelsel simuleer om studie aangaande ontwerpkompromieë,
transmissielyn kriteria en die plasing van toestelle binne die
gebruiksomgewing moontlik te maak.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/52310 |
| Date | 12 1900 |
| Creators | Doyi, Silulami J. (Silulami Julius) |
| Contributors | Reader, H. C., Van Brakel, W. J. A., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 1 v. ( various pagings) : ill. |
| Rights | Stellenbosch University |
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