Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
A charge coupled device star sensor system for a low earth orbit microsatellite
Thesis (M. Ing.) -- University of Stellenbosch, 1995.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2012
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613972943863808 |
|---|---|
| access_status_str | Open Access |
| author | Greyling, Barend Christiaan |
| author2 | Steyn, W. H. |
| author_browse | Greyling, Barend Christiaan Steyn, W. H. |
| author_facet | Steyn, W. H. Greyling, Barend Christiaan |
| author_sort | Greyling, Barend Christiaan |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Ing.) -- University of Stellenbosch, 1995. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/54625 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:38.662Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/54625 A charge coupled device star sensor system for a low earth orbit microsatellite Greyling, Barend Christiaan Steyn, W. H. Stellenbosch University. Faculty of Engineering. Department of Mechanical and Mechatronic Engineering. Artificial satellites Navigation (Aeronautics) Dissertations -- Engineering Thesis (M. Ing.) -- University of Stellenbosch, 1995. ENGLISH ABSTRACT: Star sensor systems provide extra accuracy to the attitude determination and control systems of spacecraft These systems are generally complex and costly. This text describes the development of a low cost CCD star sensor system to meet the needs of a low earth orbit micro satellite. The attitude accuracy of this satellite is low (3 arc minutes) compared to other systems. This makes the use of cheaper and less sophisticated equipment possible. An investigation was done into the system as a whole with more detailed study of the camera electronics, processing of the stellar image and pattern recognition techniques for finding the attitude. In all sub-sections of the system an attempt has been made to optimise the space of electronics and processing time of algorithms in keeping with the requirements of a micro satellite. Algorithms for image segmentation, centroid determination, pattern recognition and attitude calculation were implemented and developed. A prototype star camera was developed using the TC211 CCD and a Cosmicar lens in order to gain experience in CCD camera design and show that such a low cost system is feasible. It was found that such a project for the development and implementation of a star sensor system for a micro satellite is within reach of a small project group with limited resources and that this paper could serve as basis for such a venture . AFRIKAANSE OPSOMMING: Stersensorstelsels verskaf ekstra akkuraatheid aan die standbepaling- en beheerstelsels van ruimtetuie. Sulke stelsels is gewoonlik ingewikkeld en duur. Die ontwikkeling van 'n lae koste CCD-stersensorstelsel om die behoeftes van 'n lae-aardwentelbaan mikrosatelliet te bevredig, word hi er beskryf Die standakkuraatheid van hierdie satelliet is laag (3 minute) in vergelyking met ander soortgelyke stelsels. Dit maak die gebruik van goedkoper en minder gesofistikeerde apparaat moontlik. 'n Ondersoek is gedoen na die algehele stelsel met meer noukeurige studie van die kameraelektronika, verwerking van die sterrebeelde en patroonherkenningstegnieke vir standbepaling. Daar is in die analise van alle substelsels gepoog om die ruimte wat die elektronika beslaan en die uitvoertyd van algoritmes te optimiseer in tred met die vereistes van 'n mikrosatelliet. Algoritmes vir beeldsegmentering, beeldswaartepuntbepaling, patroonherkenning en standberekening is ontwikkel en gei:mplimenteer. 'n Prototipe sterkamera is ontwikkel met die gebruik van die TC211 CCD en 'n Cosmicar lens om ondervinding in CCD-kameraontwerp in te win en te wys dat 'n lae koste stelsel lewensvatbaar is. Daar is bevind dat 'n projek vir die ontwikkeling en implimentering van 'n stersensorstelsel vir 'n mikrosatelliet binne die bereik is van 'n klein projekspan met beperkte hulpbronne en dat hierdie tesis as basis kan dien vir so 'n ondememing. Master 2012-08-27T11:36:39Z 2012-08-27T11:36:39Z 1995 Thesis http://hdl.handle.net/10019.1/54625 en_ZA Stellenbosch University 184 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Artificial satellites Navigation (Aeronautics) Dissertations -- Engineering Greyling, Barend Christiaan A charge coupled device star sensor system for a low earth orbit microsatellite |
| title | A charge coupled device star sensor system for a low earth orbit microsatellite |
| title_full | A charge coupled device star sensor system for a low earth orbit microsatellite |
| title_fullStr | A charge coupled device star sensor system for a low earth orbit microsatellite |
| title_full_unstemmed | A charge coupled device star sensor system for a low earth orbit microsatellite |
| title_short | A charge coupled device star sensor system for a low earth orbit microsatellite |
| title_sort | charge coupled device star sensor system for a low earth orbit microsatellite |
| topic | Artificial satellites Navigation (Aeronautics) Dissertations -- Engineering |
| url | http://hdl.handle.net/10019.1/54625 |
| work_keys_str_mv | AT greylingbarendchristiaan achargecoupleddevicestarsensorsystemforalowearthorbitmicrosatellite AT greylingbarendchristiaan chargecoupleddevicestarsensorsystemforalowearthorbitmicrosatellite |