Doctoral Degrees (Electrical and Electronic Engineering)
Recent Submissions
-
Modelling and mitigation of specular multipath interference in a dual-frequency phase comparison FMCW radar system
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Digital signal processing technology has improved greatly over the last two decades. Increased processing power, cheaper memory and higher sampling rates have enabled the application of Frequency-Modulated ...
-
Scheduling strategies to improve quality of service for heterogeneous data over resource constrained wireless mesh networks
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Cost and bandwidth plays a major role in many telemetry and Internet of Things (IoT) application network implementations. Wireless Mesh Networks (WMNs) based on singleradio single-channel (SRSC) networks ...
-
Advances in spectral techniques for fruit quality evaluation: case of ULF-NMR and NIRS
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Industrial application of non-destructive analytical techniques still faces a challenge of lack of general and specialty models for quality evaluation. Current developments strive to alleviate this problem ...
-
Characterising the electromagnetic environment of MeerKAT
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: MeerKAT is South Africa’s 64-dish precursor radio telescope to the Square Kilometre Array (SKA), currently under construction in the semi-desert Karoo region. As these are new generation instruments, ...
-
Hardware description language modelling and synthesis of superconducting digital circuits
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: The energy demands and computational speed in high performance computers threatens the smooth transition from petascale to exascale systems. Miniaturization has been the art used in CMOS (complementary ...
-
From high-speed superconducting devices to nanosensors
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: In this dissertation the story of a research career spanning 34 years is told. It started in microelectronics in the early 1980’s and focused on aspects of design and optimization of high-voltage diodes. ...
-
Automatic flight envelope recovery for large transport aircraft
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: This thesis presents the design of an automatic flight envelope recovery system for large transport aircraft. The flight envelope of the aircraft is conceptualised to consist of the aerodynamic envelope, ...
-
Using probabilistic graphical models to detect dynamic objects for mobile robots
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: An autonomous mobile robot must be able to identify moving objects in its environment, continually as it is operating, for accurate environment mapping and collision-free navigation. This is not an easy ...
-
Fast Mesh-based physical optics for large-scale electromagnetic analysis
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: At sufficiently high frequencies, the electrical size of scattering objects become very large. The electromagnetic field simulation of such objects becomes prohibitively expensive with physically rigorous ...
-
Robust Fly-by-Wire under Horizontal Tail Damage
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: Aircraft damage modelling was conducted on a Boeing 747 to examine the effects of asymmetric horizontal stabiliser loss on the flight dynamics of a commercial fly-by-Wire (FBW) aircraft. Change in static ...
-
Optimised active fault detection for an open loop stable system
(Stellenbosch : Stellenbosch University, 2016-12)Active fault detection for a stable open-loop linear time invariant system is considered. The optimal active fault detection setup is developed around an estimator based architecture. The auxiliary signal and estimator are ...
-
Modelling of Antenna Responses
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: This dissertation presents surrogate modelling techniques for the radiation patterns and scattering parameters of antennas. The models are developed in the context of calibration of re ector antennas ...
-
Training neural word embeddings for transfer learning and translation
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: In contrast to only a decade ago, it is now easy to collect large text corpora from theWeb on any topic imaginable. However, in order for information processing systems to perform a useful task, such as ...
-
SQUID geomagnetic signal analysis and modelling of Schumann Resonances in the earth-ionosphere cavity
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Due to its extreme sensitivity to magnetic flux, vast dynamic range and wide bandwidth, the Superconductive Quantum Interference Device (SQUID) is at the frontier of all existing magnetic field sensors. ...
-
Automated aerial refuelling of a large receiver aircraft
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Performing aerial refueling of a large receiver is an extremely strenuous task for a pilot. Automating the aerial refueling for a large receiver is thus highly desirable. While significant research has ...
-
Miniaturised multilayer RF and microwave Circuits
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Ceramic and laminate multilayered technologies are explored in the design of novel circuit topologies and in novel implementations of classical circuit topologies. A cross-slot coupled filter topology ...
-
Spinning solar sail : the deployment and control of a spinning solar sail satellite
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Solar sailing has become a viable and practical option for current satellite missions. A spinning solar sail has a number advantages above a 3-axis stabilised sail. A spinning sail is more resistant to ...
-
Design of a dual-polarized dense dipole array for SKA mid-frequency aperture array
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: This dissertation presents the design of a dual-polarized Dense Dipole Array, or “DDA”, as a candidate element for the SKA Mid-Frequency Aperture Array. The design consists of tightly coupled dipole ...
-
A Fixed Switching Frequency technique for finite-set model predictive control of power electronic converters
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: A fixed switching frequency scheme for finite-control-set model predictive control is resented. The purpose of the control scheme is to achieve an output waveform quality that compares well to that of a ...
-
Evaluation and design aspects of magnetic gears and magnetically geared electrical machines
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: In the past decade, magnetic gears and magnetically geared electrical machines have emerged as electromechanical devices with exceptionally high torque densities. Their distinct advantages such as low ...
-
Karoo Array Telescope site shielding : laboratory, computational and multi-copter studies
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The Northern Cape in South Africa has been chosen to host the Square Kilometre Array (SKA) due to the area’s overall radio quietness. As part of the supporting systems for the Karoo Array Telescope ...
-
Prosody modelling for a Sesotho text-to-speech system using the Fujisaki model
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: Please refer to full text for abstract.
-
Multi-mode antennas for hemispherical field-of-view coverage
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation proposes a multi-mode antenna element excited through a multiconductor feed. It is shown that each of the orthogonal transverse electromagnetic modes supported by the antenna feed ...
-
Circuit model design of conical transmission line power combiners and isolation of reactive combiners
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation presents a circuit-based design technique that leads to benefits in terms of the physical size, manufacturability, and exibility in the design of N-way conical line power combiners. ...
-
Modal-based design techniques for circular quadruple-ridged flared horn antennas
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: This dissertation presents modal-based techniques for the effective systematic design of quadruple-ridged flared horns (QRFHs) as reflector feeds for radio astronomy applications. A new excitation ...
-
RSFQ digital circuit design automation and optimisation
(Stellenbosch : Stellenbosch University, 2015-03)ENGLISH ABSTRACT: In order to facilitate the creation of complex and robust RSFQ digital logic circuits an extensive library of electronic design automation (EDA) tools is a necessity. It is the aim of this work to ...
-
Efficient numerical analysis of finite antenna arrays using domain decomposition methods
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: This work considers the efficient numerical analysis of large, aperiodic finite antenna arrays. A Method of Moments (MoM) based domain decomposition technique called the Domain Green's Function Method ...
-
Reverberation chamber time and frequency metrology for MeerKAT systems shielding evaluation
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: Electromagnetic shielding plays a significant role in the protection of electronic equipment. Its application is essential for mitigating radio-frequency interference for the Karoo Array Telescope ...
-
Synthesis methods for multi-band coupled resonator filters
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: In this dissertation a number of techniques to design multi-band filters, with specific focus on coupled resonator implementations, is presented. Multi-band transfer functions are constructed from ...
-
Critical evaluation and application of position sensorless control techniques for reluctance synchronous machines
(Stellenbosch : Stellenbosch University, 2014-04)ENGLISH ABSTRACT: The position sensorless controllability of the reluctance synchronous machine (RSM) is investigated in this thesis with the focus on industry applications where variable and dynamic torque is required ...
RSS 1.0