초록 ▼

∘ 국내외 특허 및 문헌조사를 통해 초점면부 영상 안정화 보정 기구에 대한 기술조사
∘ 저궤도 소형위성에 적용하기 위한 위성카메라 요구도 수립 및 해상도 3.8m급 목표광학계 설계
∘ CATIA를 사용하여 3개의 스테이지로 구성된 초점면부 보정장치의 진동보상 메커니즘 개념설계
∘ 초점면부 보정장치 작동기로 정밀제어가 가능하고 빠른 응답속도를 가지며 변위센서가 내장된 Piezo-actuator(x,y축), z축으로 선형 특성을 가진 VCM(Voice Coil Motor)을 선정 및 성능해석
∘ 공간과 무게의 제약

∘ 국내외 특허 및 문헌조사를 통해 초점면부 영상 안정화 보정 기구에 대한 기술조사
∘ 저궤도 소형위성에 적용하기 위한 위성카메라 요구도 수립 및 해상도 3.8m급 목표광학계 설계
∘ CATIA를 사용하여 3개의 스테이지로 구성된 초점면부 보정장치의 진동보상 메커니즘 개념설계
∘ 초점면부 보정장치 작동기로 정밀제어가 가능하고 빠른 응답속도를 가지며 변위센서가 내장된 Piezo-actuator(x,y축), z축으로 선형 특성을 가진 VCM(Voice Coil Motor)을 선정 및 성능해석
∘ 공간과 무게의 제약조건에 상응하고 x,y,z축으로 병진운동이 가능한 3자유도 보정기구 상세설계
∘ 보정장치의 동역학적 해석 및 동특성 실험을 통해 보정기구의 실험적 전달함수를 얻고, 제어 알고리즘 설계 및 구현
∘ 초점면부 보정장치 상세설계를 토대로 보정장치 제작/조립/성능시험 수행
∘ PID 제어기를 적용한 폐루프 구성으로 보정장치 시스템의 강인성 증대
∘ 위성카메라 실제 진동모사 실험장치 설계 및 제작
∘ 설계된 시스템의 추종 성능을 시뮬레이션과 실험으로 검증 및 파라미터 최적화 수행
∘ 미세진동 보상기법인 렌즈 시프팅 방식 적용을 위한 목표광학계 설계 및 보상기법 개념설계 완료

(출처 : 보고서 요약서 3p)

Abstract ▼

Purpose & Contents
A focal plane control method for image stabilization of high resolution space camera has been developed in this study. This method is specially applicable for compact space camera having a small short lens assembly or deployable optical structures. Compact space camera needs v

Purpose & Contents
A focal plane control method for image stabilization of high resolution space camera has been developed in this study. This method is specially applicable for compact space camera having a small short lens assembly or deployable optical structures. Compact space camera needs vibration control to guarantee the quality of images definitely. The most effective vibration control method for image stabilization is the focal plane control method that has to be developed in this study. This method can compensate the vibration disturbance on the focal plane in more simple and effective way, as compared with other methods, such as satellite stabilization or camera stabilization. Because it can be assembled inside the space camera, it can be applied for the deformation of space camera structures easily. Therefore this method can be applicable to improve the image quality of a deployable optical structure after deploying process.
Orbit motion, attitude instability and vibration from the internal actuator of a satellite cause image distortion of the earth image from the stellite camera. Moreover in case of a deployable optical structure, for image stabilization, the optical system should be applied engineering technology such as autofocus, vibration reduction and misalignment compensation by deformation of the optical structure. These are essential things to improve the quality of its image. In this study, the focal plane control method that is controlling the focal plane directly is developed, which is the best effective way for the image stabilization of satellite. First of all, we analyzed the state of domestic and foreign focal plane stabilization technology and conducted conceptual design for the focal plane control method. Also, target optical system was designed and requirements for the system was determined. Actuators and sensors to be equipped with the compensation device was selected and their performance was analyzed. Furthermore we conducted detail design of the compensation device on the focal plane for image stabilization, and analyzed its performance. Then we manufactured the designed compensation device and verified its performances to micro-vibration disturbance given by the reaction wheels through experiments. The dynamic modeling of the compensation device was done through dynamic characteristic experiments, and the transfer function was obtained by using the experiments data. PID control algorithm for the compensation device was designed and its performance was verified. The micro-vibration disturbance was realized by using 1-axis vibration shaker. In addition, the conceptual and detailed design for a new target optical system was conducted to apply the lens shifting method, the correcting lenses for the vibration compensation by shifting the light path and its driving mechanism are also designed as well.

Results
This research conducted the design and control of focal plane compensation device that is applicable to small-satellite for image stabilization. The vibration disturbance to the satellite camera was analyzed. The focal plane compensation device for the vibration disturbance was designed and manufactured to verify its performance. The focal plane vibration control system is assumed as a linear quadratic system, the dynamic modeling of the compensation device was conducted experimentally. Based on the system model, the PID controller was designed for the simulation and experiment of the compensation device. The performance of the controller was verified through experiment. In detail, the compensation device was driven in real-time with the connected exciter simulating the micro-vibration disturbance. The results show that the control performance has satisfied the system requirements, within maximum error    . In addition, the conceptual and detailed design for a new target optical system was conducted to apply the lens shifting method, the correcting lenses for the vibration compensation by shifting the light path and its driving mechanism are also designed as well.

Expected Contribution
The focal plane control method which is developed in this study, can be applied for image stabilization of a cheap small space camera and a deployable optical structure. A compact space camera needs a long expose time because it has a short small lens assembly. As the satellite motion and vibration disturbance provides a significant bad effect on the quality of satellite image because of a long expose time, the vibration control is mandatory. Therefore it is possible to improve the image quality by applying the focal plane control method. Also, the results of this study can be also applicable to deployable optical structures to correct the despace misalignment by optical axis refocusing. Recently there are many research projects about a deployable optical structure because it has advantages to reduce the development cost and launching cost. It has been found that it is a good chance to taking of high quality image from a cheap compact space camera by applying the results of this study.

(출처 : SUMMARY 5p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요약문 ... 4
• SUMMARY ... 5
• CONTENTS ... 7
• 목차 ... 8
• 제1장. 연구개발과제의 개요 ... 9
• 제 1 절 연구개발의 개요 ... 9
• 제 2 절 연구개발 대상 기술의 중요성 및 연구개발의 필요성 ... 9
• 제2장. 국내외 기술 개발 현황 ... 14
• 제 1 절 국내외 연구개발기술 국내외 현황 ... 14
• 제 2 절 선행연구의 내용 및 결과 ... 15
• 제3장. 연구 수행 내용 및 성과 ... 16
• 제 1 절 초점면부 영상안정화 기술 ... 16
• 제 2 절 광학계 설계 ... 18
• 제 3 절 보정기구 장치 ... 28
• 제 4 절 보정장치 제어성능 실험 ... 58
• 제 5 절 Lens Shift 기법 ... 81
• 제4장. 목표 달성도 및 관련 분야 기여도 ... 90
• 제5장. 연구개발성과의 활용계획 ... 95
• 제6장. 연구 과정에서 수집한 해외 과학기술 정보 ... 96
• 제7장. 연구개발성과의 보안등급 ... 97
• 제8장. 국가과학기술종합정보시스템에 등록한 연구시설·장비현황 ... 98
• 제9장. 연구개발과제 수행에 따른 연구실 등의 안전 조치 이행 실적 ... 99
• 제10장. 연구개발과제의 대표적 연구 실적 ... 100
• 제11장. 기타 사항 ... 101
• 제12장. 참고문헌 ... 102
• 끝페이지 ... 104