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Spacecraft orbit and attitude parameters impact analysis for optical imaging

Author: ZhongWeiChao
Tutor: SunZhaoWei
School: Harbin Institute of Technology
Course: Aircraft design
Keywords: Image motion velocity vector Image quality analysis Error distribution
CLC: V412.41
Type: Master's thesis
Year: 2009
Downloads: 182
Quote: 1
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Abstract


Aerospace aerospace remote sensing optical cameras is the most important remote sensors, image motion velocity vector imaging quality of optical remote sensing an important factor. In establishing the precise image motion velocity vector calculation model based on the detailed analysis of the various orbital and attitude parameters on imaging quality, research index requirements for a given spacecraft imaging parameter index assignment problems, combined with Monte Carlo Methods of error error index allocation comprehensive. Specific work of this paper include: First, the establishment of this article relates to the geocentric equatorial coordinate system, satellite orbit coordinates, satellite body coordinate system, the camera coordinate system and the image plane coordinates five coordinate system, and gives the required coordinate transformation relations; systematic analysis TDICCD imaging principle and its image quality evaluation method, the analysis shows spacecraft orbit and attitude parameters of the optical imaging of the image motion velocity by the size and drift angle to describe the image motion velocity vector reflected. Second, the establishment of the corresponding image from the target point based on the coordinate system of five, for multiple coordinate conversion, to obtain the target position of the input image motion velocity vector calculating method; optical image based on image and the object in correspondence characteristics, to get to the target location from the relationship like equation; Then the calculated parameters are involved in sorting, equations for calculating the flow, combined with several typical conditions for model and derivation process simulation. It can be calculated at any point pixel CCD image motion corresponding to the velocity vector. Third, based on the obtained image motion velocity vector model to analyze the camera image motion velocity vector modulation transfer function, respectively, on this basis, roll angle, pitch angle and yaw angle three attitude angle and roll angular velocity, pitch posture angular velocity and angular yaw rate three speeds for image motion analysis of the impact; went on to work TDICCD metastasis frequency and exposure time to research, analyze orbital parameters for imaging. Fourth, as the moving velocity vector of small attitude angle of the model processed and integrated orbital and attitude parameters of analysis of the impact on the imaging results, the image quality to meet the requirements of the spacecraft attitude pointing stability degree index distribution calculated. Indicators proposed allocation method according to specific requirements of the imaging quality of the error indicators given assignments and Monte Carlo method for allocation error error indicators were integrated, the results show that the error indicator allocated to meet the requirements of image quality, validated index allocation method is correct.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Basic theory and experiments > Flight Mechanics > Spacecraft flight mechanics > The orbit of the spacecraft ( including satellites )
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