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Iwata T.,Japan Aerospace Exploration Agency | Iwata T.,Guidance and Control Group | Tadono T.,Japan Aerospace Exploration Agency | Tadono T.,Earth Observation Research Center | And 2 more authors.
AIAA Guidance, Navigation, and Control Conference 2012

The improved accuracy of attitude sensors has revealed that change and estimation error of pointing alignment became a dominant factor in pointing determination for highresolution Earth observation. The Advanced Land Observing Satellite (ALOS), which was launched on January 24, 2006, introduced a new approach to pixel geolocation determination and enabled fast and uniformly-precise geometric correction without ground control points. In this process, the pointing alignment has been a major source of error and has required continued calibration. This paper proposes modeling and an estimation algorithm for the pointing alignment change. The modeling assumes that the change consists of a bias term, orbit periodic terms, and a long-term drift, and the estimation applies weighted least-square optimization to this model. The paper also reports its operational calibration results based on flight data. © 2012 by Takanori Iwata. Source

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