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3 m급 광학영상 촬영을 위한 6U 초소형위성 시스템 개념설계
김극남,박상영,김기환,박승한,송영범,송성찬,Kim, Geuk-Nam,Park, Sang-Young,Kim, Gi-hwan,Park, Seung-Han,Song, Youngbum,Song, Sung Chan 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.3
The purpose of this study was to present a conceptual design of the 6U micro-satellite system for optical image of 3 m GSD. An optical camera system with a payload of 3 m GSD image was designed and optimized. The optical system has a diameter of Ø78 mm, length 250 mm, and 1400 mm focal length. The requirement and constraints were configured for the 6U micro-satellite bus system with the payload. Satisfying the requirement and constraints, the subsystems of the 6U bus were designed such as attitude and orbit control, propulsion, command and data handling, electrical power, communication, structures and mechanisms, and thermal control subsystem. The mass budget, power budget, and communication link budget were also confirmed for the 6U micro-satellite comprising the optical payload and the subsystems of bus. To take optical images, a mission operation concept is proposed for the 6U micro-satellite in a low-Earth orbit. A constellation comprising many 6U micro-satellites studied in this paper, can provide with various data for reconnaissance and disaster tracking.
초소형위성체계 운용을 위한 위성궤도요소 분석 및 위성군 배치기법에 대한 고찰
이성섭 ( Soung Sub Lee ),손지혜 ( Jihae Son ),송영범 ( Youngbum Song ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.4
본 연구는 국가 초소형위성체계가 운용개념에 맞게 효과적으로 임무를 수행하기 위한 위성궤도요소 별 고려사항을 분석하고, 통상적으로 활용되고 있는 워커 기법 대비 지상반복궤적 궤도의 위성배치 기법에 대한 성능을 비교한다. 위성궤도요소 분석에서 는 초소형위성군의 고도 후보군, 동결궤도를 통한 궤도 이심율 및 근지점 경도의 활용, 적절한 궤도 경사각 선정의 필요성, 동일한 지상반복궤적을 비행하기 위한 위성군 배치 규칙 등을 제안한다. 이러한 분석 결과를 기반으로 지상반복궤적 궤도의 위성군 배치는 워커 기법과 비교하여 재방문 성능 분석, 글로벌 커버리지 특성, 궤도 일관성 측면에서 우월성이 검증된다. This study analyzes considerations for satellite orbit elements for the national micro-satellite system to effectively perform its mission in accordance with the operational concept, and compares the conventionally used Walker method to improve the performance of the satellite constellation method of the repeating ground track orbit. In satellite orbit element analysis, altitude candidate values of micro-satellite system, use of eccentricity and argument of perigee through frozen orbit, necessity of selection of appropriate orbit inclination, and satellite phasing rules for flying the same repeating ground track orbit are proposed. Based on these analysis results, the superiority of the constellation method of the repeating ground track orbit compared to the Walker method is verified in terms of revisit performance analysis, global coverage characteristics, and orbit consistency.