Doctoral Degrees (Electrical and Electronic Engineering)
Recent Submissions
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Fast star tracker hardware implementation and algorithm optimisations on a system-on-a-chip device
(2019-12)ENGLISH ABSTRACT: Star trackers are instruments used onboard a spacecraft that utilize digital image sensors, optics and digital hardware to determine the inertial attitude of the spacecraft. Currently, these star trackers ... -
Multi-layered substrate integrated Waveguide (MSIW) Waffle-Iron Filters
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: This dissertation will present the following two topics: (1) Implementation of a waffle-iron filter, utilising multi-layered substrate integrated waveguide (MSIW) technology and (2) Developing a new ... -
Analysis and design optimisation of grid-connected wound-rotor synchronous and induction motors
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The dissertation presents new approaches in the analysis, design and optimisation of three-phase cylindrical wound-rotor synchronous (WRSM) and induction (WRIM) motor types. The new approaches are based ... -
Design and performance evaluation of a permanent magnet vernier machine For wind turbine generator applications
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: Wind power conversion has emerged as one of the attractive and rapidly growing renewable energy resources. Research in this field has indicated a crucial need of developing new or improved electrical ... -
Optimisation of an impulse radiating antenna through an effective trifilar coupled-line balun
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The Square Kilometre Array (SKA) telescope { a mega-science endeavour { is planned to be the largest and most sensitive radio astronomy facility when operational. And the South African SKA (SKA-SA) ... -
Modelling and short-term forecasting of high wind speed events at operational wind farms
(2019-12)ENGLISH ABSTRACT: The increasing penetration of wind energy has prompted a reform of the prototypical operational practices of conventional power systems, especially systems dominated by thermal generation sources. The ... -
Position/speed sensor-less control of wind energy conversion systems based on Rotor-Tied Doubly-Fed induction generator systems
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The doubly-fed induction generator (DFIG) is amongst the most popular wind turbine generator in South Africa. This is partly due to the fact that its backtoback power converters are partially rated. More ... -
Contributions to microwave passive component design
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The dissertation presents an overview of the publications of the candidate and his research group on design techniques and structures for microwave passive networks which have advanced the field in a ... -
A Physical Design verification framework for superconducting electronics
(2019-12)ENGLISH ABSTRACT: A new parameterized methodology for solving physical design verification for superconductor digital electronics (SDE) is proposed. Circuit verification tools forms an important part in integrated circuit ... -
Expanding the field of view: station design for the AAMID SKA radio telescope
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The discovery of radio astronomy dates back to 1928, when Karl Jansky made the first detection of cosmic noise static. Radio astronomy is therefore a relatively young science and its development is ... -
An Analytical model of a radially magnetised longitudinal-flux permanent magnet air-cored linear oscillatory machine
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: The research presented in this dissertation is focused on the pre-optimisation-design stages of the design optimisation of air-cored radially magnetised longitudinal flux permanent magnet (LFPM) linear ... -
On the Design of Optimal Noise Matching Networks for a Class of Multi-Mode Antennas
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: In modern times, Multiple-Input-Multiple-Output (MIMO and Multiple-Input- Single-Output (MISO receivers have commonly been implemented using coupled antenna arrays. This holds many advantages, including ... -
Simulation and verifcation software for superconducting electronic Circuits
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The dissertation presents simulation and veri cation software for both high- and low-level de- signs with emphasis on superconducting integrated circuits. A static timing analysis tool called SuperSTA ... -
Large-Scale clustering of acoustic segments for sub-word acoustic modelling
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: A pronunciation dictionary is one of the key building blocks in automatic speech recognition (ASR) systems. However, pronunciation dictionaries used in state-of-the-art ASR systems are hand-crafted by ... -
Real-Time behaviour classification techniques in low-power animal borne sensor applications
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The ability to study animal behaviour is important in many areas of science, including behavioural ecology, conservation and precision farming. These studies typically employ biotelemetry tags attached ... -
Antenna elements for sparse-regular aperture arrays
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The central theme of this dissertation regards the design and analysis of antenna elements in sparse-regular aperture arrays (AAs) for radio astronomy applications. Throughout this work, a set of modelling ... -
Phase tracking electronically variable attenuators with receiver protection
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: This dissertation presents the development of a set of optimal phase tracking electronically variable attenuators. Secondly, a compact high power PIN diode limiter is developed and its minimum attainable ... -
Localization and ,litigation of radio frequency interference for interferometric arrays
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: Radio telescopes have increased exponentially in sensitivity ever since the first single dish radio telescopes were built in the 1930's. This trend continues with the development of next generation ... -
Language modelling for code-switched automatic speech recognition in five South African languages
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: Code-switching refers to natural, spontaneous language alternation by multilingual speakers during a conversation or utterance, and is prevalent in everyday conversations by multilingual South Africans. ... -
Variable bandwidth planar coupled resonator filters utilizing tunable non-resonant node inverters
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: This dissertation presents a novel design technique for designing microstrip staircase and pedestal substrate integrated waveguide (SIW) filters with tunable bandwidth. The design technique utilizes ...
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