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Now showing items 1-20 of 30
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Wideband low loss feed integration with a pyramidal sinuous antenna
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In this thesis, a pyramidal sinuous antenna is designed to be integrated with a balun. This system is to be used as the feed of a shaped, offset Gregorian reflector. Initially, a previously designed ... -
Vision-based flight control for a quadrotor UAV
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis presents the development, implementation, and practical verification of a vision-based flight control and waypoint navigation system for a quadrotor unmanned aerial vehicle (UAV). The vision-based ... -
Viability of UAV-based antenna pattern measurements
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Unmanned aerial vehicle (UAV) based field measurements have been proposed as a possible solution to provide calibration data for large ground based radio telescope arrays, such as the Mid Frequency ... -
VAST : a scalable spatial publish and subscribe system integrated with Minecraft
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: With the world becoming more connected by the day, the need for modern massively multi-user virtual environments (MMVEs) to be capable of hosting an increasing number of players is vital. Unless large ... -
Unsupervised feature learning for speech using correspondence and Siamese networks
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In automatic speech recognition systems, speaker characteristics, such as gender, pitch, and talking speed, can affect the performance of the system. Humans, however, are able to understand what is being ... -
Stabilization of a rotary wing unmanned aerial vehicle with an unknown suspended payload
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis addresses the problem of stabilizing a quadrotor with an unknown suspended payload able to swing in one axis. The payload parameters, such as its mass and cable length, are unknown and its ... -
Remote vessel detection using an optical imager and an AIS receiver combination for a CubeSat constellation
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis investigates illegal shing activities on the coast of South Africa. It was concluded that a constellation of 10 6U satellites orbiting in a specialised orbit, with repeating ground tracks, ... -
Reinforcement learning in the Minecraft gaming environment
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: With the long-term goal of surviving the night in Minecraft, we ask whether a reinforcement learning agent learns better by first learning the skills to perform smaller tasks in a complex environment or ... -
A probabilistic estimation of the capacity of solar PV SSEGs installed on a LV feeder network
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Increased solar photovoltaic (PV) installation on to the grid has led to increased technical challenges in electricity network operations. These challenges mainly stem from the design structure of the ... -
Practical probabilistic systems for satellite image segmentation and classifcation
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis undertakes the task of satellite image classification from a probabilistic perspective. Our probabilistic approach is motivated by using uncertainty to address the lack of data and variability ... -
Pasteurisation of Rooibos tea leaves using microwave radiation and the development of associated hardware
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Rooibos tea is a herbal tea that is gaining popularity worldwide. In order for it to be safe for consumption by consumers, the tea leaves are pasteurised with steam in commercial processing plants. The ... -
Optimised path planning and path tracking for autonomous vehicles with constrained kinematics in ROS
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: A significant growth of interest in the pursuit of autonomous vehicles from various stakeholders has been witnessed recently. This indicates that future transportation systems will be autonomous. By the ... -
Non-invasive measurement of quality attributes of processed pomegranate products
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Pomegranate fruit has witnessed tremendous growth over the past decade in production, consumption, processing and research within South Africa. Currently, in order to provide value-addition and effective ... -
Motion planning for a rotary-wing UAV in dynamic environments
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In order for a fully autonomous unmanned aerial vehicle (UAV) to navigate safely in dynamic environments, a conflict free trajectory between an initial and goal state of a vehicle needs to be planned ... -
Modelling and simulation of bifacial PV modules by implementing the ray tracing technique
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis shows how ray tracing can serve as an accurate irradiance mod-elling technique for bifacial PV modules. The electrical behaviour of bifacial modules is also modelled through investigation and ... -
Model predictive control with space-vector modulation for a grid-connected converter with an LCL-Filter
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This thesis presents an indirect model predictive control (MPC) strategy with spacevector modulation (SVM). The controller is used to control a high-power voltage-source inverter (VSI), connected to the ... -
Merging deep neural networks and probabilistic models using Sum product networks
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In recent years there has been renewed interest in machine learning algorithms that can explicitly model uncertainty. Machine learning has great potential to revolutionise almost every sector of our ... -
Machine learning for antenna array failure analysis
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: This work investigated the use of machine learning to detect failed elements in an antenna array. The aim was to identify a trustworthy means of early detection and isolation of faulty elements to improve ... -
GHI forecasting to extend the range of a solar powered vehicle
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: The focus of this project is to investigate, model and optimise the range of electric vehicles(EVs). To do so, the detailed modelling of an EV (2016 Nissan Leaf) is covered, to simulate the range of the ... -
Geared PM wind generator and MPPT control for DC-grid wind energy system
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In this study a geared PM generator for small-scale DC-grid connected wind energy systems is considered. A commercial 2.2 kW PM generator is evaluated using FEA software and is used for practical system ...
