위성 기동 시 SAR 안테나 반사판에 발생하는 진동 분석Vibration Analysis of SAR Antenna Reflectors During Satellite Maneuver

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Recently, there has been an increasing demand for SAR satellite as it can be operated regardless of the weather condition. In general, main reflector of the SAR is formed of multiple deployable panels to increase performance in the constrained payload envelope. By nature, deployable structure lacks structural stiffness and it is vulnerable to external disturbances and excitation. In particular, SAR satellites may have high levels of vibration occurring at the antenna reflecting surface due to higher angular rate requirements. During image capturing it is important to keep high surface accuracy of the reflector for the quality of images. In this research, a performance degradation of deployable SAR antenna due to structural deformation is analyzed. Panels for main reflectors are assumed to be flexible structures and multi-body simulation environment is established. Then, deflection of the panel is calculated while the satellite performs maneuvers. In addition, antenna gain and beam pointing error are analyzed to determine how these deflections affect antenna performance and mission.
Publisher
한국항공우주학회
Issue Date
2020-03
Language
Korean
Article Type
Article
Citation

한국항공우주학회지, v.48, no.3, pp.225 - 231

ISSN
1225-1348
DOI
10.5139/JKSAS.2020.48.3.225
URI
http://hdl.handle.net/10203/282073
Appears in Collection
AE-Journal Papers(저널논문)
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