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Document type:
Masterarbeit 
Author(s):
Jonis Kiesbye 
Title:
Hardware-in-the-Loop Verification of the Distributed, Magnetorquer-Based Attitude Determination & Control System of the CubeSat MOVE-II 
Translated title:
Hardware-in-the-Loop Verifikation des verteilten, magnetischen Lageregelungssystems von MOVE-II 
Abstract:
MOVE-II is a student-built satellite due for launch early 2018. Its attitude determination & control system (ADCS) uses magnetorquers and consists of one central Mainpanel processing the control algorithms and five peripheral Sidepanels containing the sensors and actuators. In this thesis, a hardware-in-the-loop (HiL) environment is built and operated to verify the functionality of the Mainpanel in a flight configuration. The HiL-simulation contains models of the space environment, worst-case disturbances, spacecraft dynamics, the magnetorquers, and the sensors including worst-case noise levels. The simulation outputs modeled sensor data to the Mainpanel and reads back the magnetorquer commands of the Mainpanel. This way, the test runs are not affected by the disturbances that are present with physical ADCS testing rigs like Helmholtz cages and air bearings. The ADCS control loop is analyzed and a device for interfacing the Mainpanel to the simulation is designed, manufactured, and programmed. The testing environment is automated, so it can change the simulation parameters programmatically. Both the detumbling and the sunpointing controller have been successfully verified in a worst-case simulated space environment. 32 test runs with different controller parameters, different sensor characteristics, and different environmental parameters cover a wide range of conditions that might be encountered during the MOVE-II mission. A sensitivity analysis shows the reaction of the sunpointing controller to modelling inaccuracies. The simulation estimates the power budget with greater accuracy than previous estimation techniques employed for the MOVE-II mission. During sunpointing, the satellite is power-positive in nominal mode. But the power budget in safe mode where the satellite is tumbling could not be verified to be positive. Therefore, the capability of the satellite and especially its ADCS to recover from low battery situations is analyzed. Further tests to increase confidence in the ADCS and work on a fitting environment to analyze telemetry retrieved from the satellite are suggested to assure correct operation of the ADCS during flight. 
Translated abstract:
MOVE-II ist ein von Studenten gebauter Satellit, dessen Start Anfang 2018 geplant ist. Sein Lageregelungssystem nutzt Magnetorquer und besteht aus einem zentralen Mainpanel, das die Regleralgorithmen ausführt, sowie fünf Sidepanels mit den Sensoren und Aktoren. In dieser Arbeit wird eine Hardware-in-the-Loop (HiL) Umgebung gebaut und genutzt, um die Funktionalität des Mainpanels in Flugkonfiguration zu verifizieren. Die HiL-Simulation beinhaltet Modelle von Weltraumumgebung, Störmomenten, M...    »
 
Keywords:
HiL, Verification, Simulation, Hardware-in-the-Loop, Test, Satellite, CubeSat, ADCS, Magnetic, Active, Attitude, Controller, MOVE-II, Munich 
Subject:
GEO Geowissenschaften; VER Technik der Verkehrsmittel 
DDC:
620 Ingenieurwissenschaften 
Advisor:
Langer, Martin 
Date of acceptation:
20.10.2017 
Year:
2017 
Pages:
152 
Language:
en 
Language from translation:
de 
Notes:
RT-MA-2017/16 
University:
Technische Universität München 
Faculty:
Fakultät für Maschinenwesen 
Presentation date:
07.12.2017