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Publié par | technische_universitat_munchen |
Publié le | 01 janvier 2007 |
Nombre de lectures | 473 |
Langue | Deutsch |
Poids de l'ouvrage | 9 Mo |
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Lehrstuhl für Raumfahrttechnik Technische Universität München Data Handling and Evaluation for Autonomous Experiments in Interplanetary Missions Robert Senger Vollständiger Abdruck der von der FMünchen zur Erlangung des akademakultät für Maschinenwischen Grades eines esen der Technischen Universität
Doktor Ingenieurs igten Dissertation. genehm Vorsitzender: Univ.-Prof. Dr. rer. nat. Ulrich Walter
Prüfer der Dissertation: 2.1.Univ.-ProfUniv.-Prof. Dr.-Ing. Horst Baier . Dr.-Ing. Eduard Igenbergs, i. R.
apl. Prof. Dr. rer. nat. Eberhard Grün, 3. Ruprecht-Karls-Universität Heidelberg
Die Dissertation wurde am 16.10.2006 bei der Tec hnischen Universität München eingereicht
26.06.2007 angenommen. und durch die Fakultät für Maschinenwesen am
Vorsitzender: Prüfer der Dissertation:
1.2.3.
Data Handling and Evaluation
for Autonomous Experiments
in Interplanetary Missions
Robert Senger
eFür m
inen Vater Heinz
30.12.2004
Vorwort An dieser Stelle möüber all die Jahre begleitet haben. An ersterchte ich allen danken di Stee mille meinem Doktch während der Anfertigung dieser Arbeit orvater Prof. Eduard
Nachfolger als Leiter ung und Geduld. SeinemIgenbergs für seine immerwährende Unterstützdes Lehrstuhls, Prof. Ulrich Walter, für die Freiheiten die ich am Lehrstuhl genießen durfte.
Allen Kollegen, deren nwürde, für die stets gute Atamemosphäre amntliche Nennung den Rahm Lehrstuhl. en dieser wenigen Zeilen sprengen
Ohne ihr unerschütterliches Mein ganz besonderer Dank gilt meiner Mutter Ursula und mVertrauen und ihre fortwährende bedingungslose Unterstützung einer Lebensgefährtin Dagmar.
auch in schwierigsten Zeiten wäre die Fertigstellung dieser Arbeit nicht möglich gewesen.
München, den 2.11.2006
Table of Contents 1 ........................................................................................................................1 Introduction2 Exploration of cosmic dust.................................................................................................3
4 .............................................................................................Dust in the solar system2.1 2.1.1 Physical properties and orbital dynamics...........................................................5
2.1.2 2.1.3 Circumplanetary Interplanetary and interstelladustr dust in the heliosphere..............................................................................................................................10 7
12 ......................................................................................................debris2.1.4 Space 2.1.5 Exemplary instruments and missions...............................................................13
2.2 The MDC mission HITEN, (formerly MUSES-A)..................................................17
2.2.1 Spacecraft properties........................................................................................17
18 .............................................................................................................2.2.2 Mission2.2.3 Results of the MDC-HITEN dust measurements.............................................20
21 ............................................The MDC mission NOZOMI, (formerly PLANET-B)2.3 2.3.1 Spacecraft properties and operations................................................................21
22 .............................................................................................................2.3.2 Mission3 2.3.3 The Mars DuThe scientific mst Counterission of the MDC......................................................................................................................................................................27 26
3.1 3.1.1 The MDC measuring principlePhysical background of the impact ionization process.....................................................................................................................28 28
3.1.2 3.2 Technical Material, geompropertiesetrical and other artifacts...........................................................................................................................................................31 29
3.2.1 Experiment design............................................................................................31
32 ..................................................................................Onboard data processing3.2.2 3.2.3 MDC structural integration and effective solid angle......................................36
3.2.4 Instrument detection capabilities......................................................................50
52 .......................................................................................Data processing on ground3.3 3.3.2 Data 3.3.1 Calibrationanalysis............................................................................................................................................................................................................54 52
4 Signal 4.1 Basics screeningand motivation.............................................................................................................................................................................................................57 57
4.2 Improvement of the onboard qualification...............................................................57
4.2.1 The 4.2.2 Genetic qualification algorithmsroutine.............................................................................................................................................................................59 58
4.2.3 Optimization of the qualification parameter set...............................................60
4.3 4.3.1 History and Signal screening by neural networksbasics....................................................................................................................................................................65 65
4.3.2 Components and functionality of neural networks..........................................66
4.3.4 4.3.3 ImplemReduction of the input parametersentation....................................................................................................................................................................70 69
4.3.5 Determination of the optimal topology............................................................72
75 ...........................................................................Further potential applications4.3.6 76 ..........................................................................................ary and discussionSumm4.4 5 Data compression onboard the MDC...............................................................................79
5.2 Data 5.1 Basics comand pressionmotivation...................................................................................................................................................................................................80 81
5.2.1 Lossy compression...........................................................................................81
5.2.2 Discrete Wavelet Transformation (DWT)........................................................82
V
5.2.3 Compression of MDC signals..........................................................................86
5.3 Implementation and integration of the MDC onboard software upgrade................89
5.3.2 5.3.1 Integration of the upgrade inHardware and software restrictionsto the existing software.........................................................................................................89 90
92 ..................................................................Verification of the new analysis process5.4 5.4.1 Analysis of MDC-NOZOMI data after compression/decompression..............94
5.4.2 Analysis of MDC-HITEN data after compression/decompression..................94
5.5 6 Mission Summary and discussionresults..........................................................................................................................................................................................................103 96
6.2 6.1 OverviewNoise signals and flight data interpretation............................................................................................................................................................................103104
6.2.1 Noise signals and instrument dead time.........................................................105
6.2.2 MDC view-axis determination from NOZOMI attitude................................123
6.2.4 6.2.3 NOZOMI flMDC operating dataight data and sensor pointing directions............................................................................................................................145 131
149 .............................................cinity of Earth and MoonParticles detected in the vi6.3 6.3.2 6.3.1 OverviewDust flux determination..