A Research On High-speed Star-tracker for Atittude Determination and Control System of Spacecrafts위성의 자세 결정 및 제어 시스템을 위한 고속 별 추적기 연구

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Star Trackers are often the most accurate instrument in an Attitude Determination and Control Systems , but often present a slow update rate, requiring additional sensor and sensor fusion algorithms to provide a smoother and faster output. However, the available rate gyros are either noisy, or expensive and heavy. The~proposed work investigates the feasibility of high-speed star trackers with modern optics, sensors, and computing systems. Firstly, we investigate the sensitivity of an optoelectrical acquisition system stimulated by dim stars, secondly, we propose and evaluate an algorithm designed to operate at high speed and to be compatible with an Field-Programmable Gate Array implementation, before evaluating the performance of the implementation on FPGA. Finally, we debate the usability of such a system, both in terms of compatibility with a mission and CubeSat ecosystems, and in terms of performance. As a result, aside from removing the need for a rate gyro, Attitude Determination and Control Systems overall pointing performances can be increased. The proposed attitude determination system achieved a 0.001° accuracy, with a 99.1\% sky coverage and an ability to reject false-positive while performing a single-frame lost-in-space star identification at a 50 Hz update rate with a total delay of 19 ms, including 13 ms.
Advisors
Bang, Hyochoongresearcher방효충researcher
Description
한국과학기술원 :항공우주공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학과, 2020.8,[iv, 48 p. :]

Keywords

Star Tracker▼astar detection▼ahigh-speed▼aIMU-free▼aerror correction▼aattitude determination▼aADCS▼aCubeSat▼acomputer vision▼aFPGA; 스타 트래커▼a스타 탐지▼a고속▼aIMU 프리▼a오류 수정▼a자세 결정▼aADCS▼aCubeSat▼a컴퓨터 비전▼aFPGA

URI
http://hdl.handle.net/10203/284348
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=924348&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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