Thesis (MEng) Stellenbosch University, 2014 / ENGLISH ABSTRACT: An Attitude Determination and Control System (ADCS) demonstrator and testing platform
was required for satellite engineering students. The ADCS demonstrator and testing
platform will allow students to develop insight into the concepts and challenges of ADCS
design and implementation. The existing model nano-satellite EyasSAT was used as a
design platform for a new ADCS demonstrator. A new ADCS module (ADCS_V2) was
developed to replace the existing EyasSAT ADCS module. The new module allows for
three-axis ADCS and the demonstration of the ADCS on an air bearing platform. The air
bearing allows full freedom of movement for yaw rotations with limited pitch and roll rotations.
The actuators and sensors required for the ADCS were developed and integrated
into EyasSAT. In addition a new PCB was designed to form the ADCS_V2 module. Attitude
determination algorithms and attitude control algorithms were implemented and
tested using MATLAB Simulink simulations. These algorithms were then implemented
on the ADCS_V2 module. The ADCS was tested using Hardware In the Loop (HIL)
techniques and an air bearing. The yaw attitude of EyasSAT could be controlled within
0.4 degrees accuracy with all the sensors active. In order to stabilize the air bearing
platform, the pitch and roll angles were rate controlled. The pitch and roll rates were
damped to within 6 mrad/s. / AFRIKAANSE OPSOMMING: ’n Oriëntasiebepaling en Beheerstelsel (OBBS) demonstrasie en toets platform was benodig
vir satellietingenieurswese studente. Die nuwe OBBS sal studente toelaat om insig te
ontwikkel met betreking tot die idees en uitdagings wat verband hou met die ontwikkeling
en implementering van ’n OBBS. Die huidige nano-sateliet model EyasSAT was gebruik
as ’n ontwerpsbasis vir die nuwe OBBS. Die nuwe OBBS was ontwikkel om die huidige
module van EyasSAT te vervang. Die nuwe OBBS laat oriëntasiebepaling en -beheer in
drie asse toe. Die nuwe OBBS en EyasSAT kan die werking van ’n OBBS demonstreer
op ’n luglaerplatform. Die luglaer laat vrye rotasie om die gierhoek toe terwyl die rol- en
stygings-as beperk word. Die aktueerders en sensors wat benodig word vir die OBBS is
ontwikkel en geïntegreer in EyasSAT saam met ’n nuwe gedrukte stroombaanbord om die
nuwe OBBS te vorm. Orientasiebepaling en orientasiebeheer algoritmes is geïmplementeer
en getoets met die hulp van MATLAB Simulink simulasies. Die algoritmes was op
die OBBS module geïmplementeer en getoets deur gebruik te maak van HIL tegnieke en
praktiese toetse op die luglaer. Die rotasie hoek van EyasSAT kan met ’n akkuraatheid
van 0.4 grade beheer word indien al die sensors gebruik word. Die rol en stygingshoeksnelheid
was gekanselleer om die luglaer stabiel te hou. Die hoeksnelheid van die twee
asse kon tot kleiner as 6 mrad/s beheer word.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/86653 |
| Date | 04 1900 |
| Creators | Groenewald, Christoffel Johannes |
| Contributors | Steyn, W. H., 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 | xvi, 163 p. : ill. |
| Rights | Stellenbosch University |
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