Toward faster and more accurate star sensors using recursive centroiding and star identification

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Title: Toward faster and more accurate star sensors using recursive centroiding and star identification
Author: Samaan, Malak Anees
Abstract: The objective of this research is to study different novel developed techniques for spacecraft attitude determination methods using star tracker sensors . This dissertation addresses various issues on developing improved star tracker software , presents new approaches for better performance of star trackers , and considers applications to realize high precision attitude estimates . Star -sensors are often included in a spacecraft attitude -system instrument suite , where high accuracy pointing capability is required . Novel methods for image processing , camera parameters ground calibration , autonomous star pattern recognition , and recursive star identification are researched and implemented to achieve high accuracy and a high frame rate star tracker that can be used for many space missions . This dissertation presents the methods and algorithms implemented for the one Field of View 'FOV' StarNavI sensor that was tested aboard the STS -107 mission in spring 2003 and the two fields of view StarNavII sensor for the EO -3 spacecraft scheduled for launch in 2007 . The results of this research enable advances in spacecraft attitude determination based upon real time star sensing and pattern recognition . Building upon recent developments in image processing , pattern recognition algorithms , focal plane detectors , electro -optics , and microprocessors , the star tracker concept utilized in this research has the following key objectives for spacecraft of the future : lower cost , lower mass and smaller volume , increased robustness to environment -induced aging and instrument response variations , increased adaptability and autonomy via recursive self -calibration and health -monitoring on -orbit . Many of these attributes are consequences of improved algorithms that are derived in this dissertation .
URI: http : / /hdl .handle .net /1969 .1 /433
Date: 2004-09-30

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Toward faster and more accurate star sensors using recursive centroiding and star identification. Available electronically from http : / /hdl .handle .net /1969 .1 /433 .

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