A Model-Based Systems Engineering (MBSE) approach to development of attitude determination and control subsystem for first micro-satellite in Vietnam

MicroDragon is the Vietnam’s first microsatellite, being developed by collaboration of Vietnam and Japan since 2014. The satellite consists of seven subsystems. Among those subsystems, Attitude Determination and Control System (ADCS), which deals with determining the satellite orientation and controlling motion, is one of the most important and complicated subsystems. However, VNSC members, with lack of experience in prior satellite development, find it difficult to assess completeness and consistency in developing ADCS, particularly using a document-based approach. This research aims at applying a model-based system engineering (MBSE) approach for designing ADCS for MicroDragon satellite. Beginning with analysing context, requirements, stakeholders and their needs, the development process continues with a functional analysis using use cases. Then ADCS architecture is designed. A model of ADCS is developed by using SysML. The verification of design is done by physical checking connections of ADCS components, making satisfy requirements matrix, and analysing traceability of requirements and performance in SysML. The validation of research is done by doing two kinds of interviews: one with VNSC member to assess the potential of MBSE, and the other with MDG members for the effectiveness of the ADCS model. A model-based system engineering approach can support development of ADCS and provide an opportunity for inexperienced engineers to systematically understand ADCS development process. Key Word(5 words) MBSE, SysML, MicroDragon, ADCS, Micro Satellite Master’s Dissertation 2016 III Acknowledgements Foremost, I would like to express my sincere gratitude to my supervisor, Professor IOKI Makoto for the continuous support of my research, for his recommendations to direct the research and for his patience, motivation, enthusiasm and immense knowledge. The research would not have been completed without his support. My honest thanks go to my second advisor Professor MAENO Takashi, Professor SHIRASAKA Seiko, and Professor NISHIMURA Hidekazu for spending time on helping me and giving me valuable comments and suggestions and for their great support during two years of my master course in SDM. I would like to thank Mr VU Viet Phuong, Doctor LE Xuan Huy and Doctor TRUONG Xuan Hung for becoming interviewees in my research, for their great advices and comments during the interview. I am thankful to HIRAMATSU Takashi Sensei, YAMAURA Shusaku Sensei, TOKAJI Ayumu Sensei, who provided me with an excellent atmosphere for doing research an patiently corrected my writing of this thesis. I would like to thank my colleagues at Vietnam National Satellite Center for giving me great supports all the time I have stayed in Japan. Many thanks to NGUYEN Dinh Quan, DO Anh Tuan, TRINH Hoang Quan, NGUYEN Son Duong, NGUYEN Van Thuc, TRAN Van Ninh, NGO Thanh Cong and the other members of the MicroDragon project. My sincere thanks go to School of Graduate System Design and Management, Keio University for providing me with all necessary facilities for the research, for compelling lectures and activities that I have had in the last two years. Finally, my special thanks go to my family for giving me their endless love and encouraging me every moment I have stayed in Japan. Japan, July 15, 2016 Cao Xuan HIEP Master’s Dissertation 2016 IV Table of