초점거리 편의가 지상 정확도에 미치는 영향 비교 연구 - 세가지 라인 스캐너를 대상으로 - (Comparative Analysis of Focal Length Bias for Three Different Line Scanners)

서지정보

· 발행기관 : 한국측량학회
· 수록지 정보 : 한국측량학회지 / 32권 / 4호 / 363 ~ 371페이지
· 저자명 : 김창재

초록

다수의광학위성센서들이선형 배열 형태에 기반을두고설계되었다. 널리알려진광학위성센서의종류는다음과같이경로평행방향1열스캐너(along-track line scanner), 경로직각방향1열스캐너(across-track linescanner), 3열스캐너(three- line scanner)로구분할수있다. 이들센서들을이용하여 위성 및 항공기에서지상지물의정확한위치정보를획득하려고할때센서의외부표정요소와내부표정요소는매우중요한요소들이다. 이들센서들의 영상생성기하구조는 태양에 의한열영향, 진동, 바람등의다양한물리적현상들에의하여시시각각변동될가능성이 있기에 내부표정요소의 편의가지상에미치는영향을분석하는것은매우중요하다. 실제적인비행경로와자세정보를바탕으로생성된 시뮬레이션 자료를 이용하여 본 연구에서는 각센서의초점거리에편의량을점진적으로추가하면서실험과 분석을 수행하였으며,또한비행고도를고고도와저고도의두가지경우로비교하였다.실험결과, 경로평행방향1열스캐너의경우에초점거리편의량의증가가지상스캔라인방향(Y 방향)의오차를유발하였으며, 경로직각방향1열스캐너의경우스캔라인방향과 수직방향으로오차가증가하였고, 3열스캐너의경우에는수직방향으로만오차가증가하였다. 이들실험결과는향후새로운센서개발과센서캘리브레이션정확도에가이드라인을제공할수있다고본다.

영어초록

Most space-borne optical scanning systems adopt linear arrayconfigurations. The well-knownthree differenttypes of space-borne sensors arealong-track line scanner, across-track linescanner, and three line scanner. Toacquire accurate location information of an object on the ground withthose sensors, the exterior and interiororientation parameters are critical factors for both of space-borne and airborne missions. Since the imaginggeometry of sensors mightchange time to time due to thermal influence, vibration, and wind, it is very importantto analyze the Interior Orientation Parameters (IOP) effects on the ground. The experiments based on syntheticdatasets arecarried out while the focal length biases are changing. Also, both high and low altitudes of theimagingsensor were applied. In case with the along-track line scanner, the focal length bias caused errors alongthe scanline direction. In the other case with the across-track one, the focal length bias caused errors alongthescan line and vertical directions. Lastly, vertical errors were observed in the case ofthree-line scanner. Thoseresults from this study will be able to provide the guideline for developing new linearsensors, so as for improvingthe accuracy of laboratory or in-flight sensor calibrations.

참고자료

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