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Development of a Star Camera Algorithm for Calculating thePosition on Earth and Mars (VaMEx DLR)
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
2017 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Within the scope of the Valles Marineris Explorer mission of the German Aerospace Center(DLR), the position of a ground vehicle on Mars needs to be determined. Due to the fact thatMars has no global magnetic field and no positioning system like Earth, a facility independentsystem is necessary. In this context, a star camera based positioning system shall be developed.The subject of this thesis is the development, implementation and verification of a star camerabased transformation algorithm for calculating the latitudinal and longitudinal position on Mars.In addition, an Earth based transformation algorithm is developed, implemented and evaluated fortesting purposes, that is for testing the hardware for the mission under real conditions on Earth.The thesis gives an insight into the fundamental theory of transformation algorithms commonlyused for the transformation between celestial and planet coordinate systems. A self-developedtransformation algorithm is presented which is able to transform a tilted star vector in TopocentricHorizon Coordinate System into observer longitude and latitude position. Moreover, themodular implementation in MATrix LABoratory (MATLAB) and Realtime Onboard DependableOperating System (RODOS) is described in detail. In the further course of the thesis the results ofdifferent test scenarios are outlined and evaluated. The overall results are eventually discussed regardingtheir implications for the mission and subsequently, suggestions for further improvementof the algorithm are made.

sted, utgiver, år, opplag, sider
2017. , 132 s.
HSV kategori
Identifikatorer
URN: urn:nbn:se:ltu:diva-62870OAI: oai:DiVA.org:ltu-62870DiVA: diva2:1086738
Fag / kurs
Student thesis, at least 30 credits
Utdanningsprogram
Space Engineering, master's level (120 credits)
Presentation
, Würzung (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2017-04-05 Laget: 2017-04-03 Sist oppdatert: 2017-04-05bibliografisk kontrollert

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