항공우주시스템공학회지 (Journal of Aerospace System Engineering)

  • 제13권4호
  • /
  • Pages.26-36
  • /
  • 2019
  • /
  • 1976-6300(pISSN)
  • /
  • 2508-7150(eISSN)
항공우주시스템공학회 (The Society for Aerospace System Engineering)
권호 표지
DOI QR코드

DOI QR Code

포커스 메커니즘이 적용된 소형 위성 카메라의 제작 및 성능 실험

Fabrication and Performance Test of Small Satellite Camera with Focus Mechanism

  • 홍대기 (한국항공대학교 항공우주 및 기계공학과) ;
  • 황재혁 (한국항공대학교 항공우주 및 기계공학부)
  • Hong, Dae Gi (Dept. of Aerospace and Mechanical Engineering, Graduate School at Korea Aerospace University) ;
  • Hwang, Jai Hyuk (Dept. of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 투고 : 2019.03.09
  • 심사 : 2019.08.02
  • 발행 : 2019.08.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

고해상도 지구 관측위성에서는 광학 부품간 정밀한 위치 정렬도가 요구된다. 그러나, 가혹한 위성 발사환경 및 우주환경 같은 외부 요인에 의해 광부품의 정렬오차가 발생한다. 이러한 정렬오차에 의해 저하된 영상품질을 보상하기 위해 포커스 메커니즘이 적용된 위성광학계의 설계가 필요하다. 본 논문에서는 위성카메라 정렬오차 보상이 가능한 목표광학계의 제작 및 성능 실험에 대한 연구를 수행하였다. 먼저 설계된 목표광학계를 제작/조립/정렬하였으며, 이 완료된 목표 광학계를 사용하여 영상 촬영 실험을 수행하였다. 영상 촬영 실험은 포커스 메커니즘에 의한 상의 변화를 이미지로 확인하는 실험과 오토콜리메이터를 이용하여 USAF 타깃을 촬영해 MTF를 분석하는 실험을 수행하였다. 실험 결과를 통해 포커스 메커니즘을 통하여 정렬오차를 충분히 보상할 수 있음을 확인하였으며, 궤도상에서 정렬오차를 보상할 수 있는 리포커싱의 기초자료를 확보하였다.

The precise alignment between optical components is required in high-resolution earth observation satellites. However, the misalignment of optical components occurs due to external factors such as severe satellite launch environment and space environment. A satellite optical system with a focus mechanism is required to compensate for the image quality degraded by these misalignments. This study designed, fabricated, aligned precisely, and carried out a performance tests for the image quality of the system. The satellite optical camera performance tests were carried out to check the image quality change by operating the focus mechanism and to analyze the satellite optical system MTF by photographing USAF target using the autocollimator. According to the experimental results, the misalignments can be compensated sufficiently with the focus mechanism. Finally the basic data for re-focusing algorithm of the optical system was obtained through this study.

키워드

참고문헌

  1. G. S. Kim, "Development Trends in Super High Resolution Earth Observation Optical Satellite," Current Industrial and Technological Trends in Aerospace, Vol. 11, No. 2, pp. 101-110, 2013.
  2. Y. S. Yoon and K. J. Min, "Industry Trend and Development Status of Nano/Micro Satellite," Current Industrial and Technological Trends in Aerospace, Vol. 14, No. 1, pp. 18-25, 2016.
  3. D. G. Hong and J. H. Hwang, "Design of 3-Axis Focus Mechanism Using Piezoelectric Actuators for a Small Satellite Camera," Journal of Aerospace System Engineering, Vol. 12, No. 3, pp. 9-17, 2018. https://doi.org/10.20910/JASE.2018.12.3.9
  4. J. Heo, C. W. Kim, S. S. Kim, B. W. Kim, "Airborne EO/IR Sensor Technology," Proceedings of KSAS, Vol. 2013, No. 11, pp. 962-966, 2013.
  5. J. B. Jo, J. H. Hwang and J. S. Bae, "Optical Design for Satellite Camera with Online Optical Compensation Movements," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 43, No. 3, pp. 265-271, 2015. https://doi.org/10.5139/JKSAS.2015.43.3.265
  6. S. H. Lee, K. T. Hwang, H. J. Cho, H. J. Seo, G. W. Moon, "A Study on the PZT Application for Spacecraft Components," Aerospace Engineering and Technology, Vol. 12, No. 1, pp. 32-39, 2013.
  7. H. J. Kim, Y. D. Seo, S. K. Youn, S. H. Lee, D. G. Lee, E. S. Lee, "Optimal Design of the Flexure Mounts for Satellite Camera by Using Design of Experiments," Transactions of The Korean Society of Mechanical Engineers A, Vol. 32, No. 8, pp. 693-700, 2008. https://doi.org/10.3795/KSME-A.2008.32.8.693
  8. B. K. Moon, W. S. Jeong, S. M. Cha, C. H. Ree, S. J. Park, D. H. Lee, I. S. Yuk, Y. S. Park, J. H. Park, U. W. Nam, Matsumoto Toshio, Yoshida Seiji, S. C. Yang, S. H. Lee, S. W. Rhee, W. Han, "Development of the Mechanical Structure of the MIRIS SOC," Publications of the Korean Astronomical Society, Vol. 24, No. 1, pp. 53-64, 2009. https://doi.org/10.5303/PKAS.2009.24.1.053
  9. Hecht Eugene, "Optics," Pearson, pp. 141-142, 2017.
  10. N. Koren, "The imatest program: Comparing cameras with different amounts of sharpening," Proceedings of SPIE International Symposium on Electronic Imaging, vol. 6069, pp. 195-203, 2006.
  11. K. Kohm, "Modulation Transfer Function Measurement Method and Results for the OrbView-3 High Resolution Imaging Satellite," International Archives of Photogrammetry Remote Sensing and Spatial Information Sciences, Vol. 35, No. 1, pp. 7-12, 2004.