Size and mass of high resolution satellite cameras are usually determined by the optics. Main problems, associated with minimizing the optics size are the degradation of the modulation transfer function (MTF), resulting in image smoothing, and darkening of the image. MTF degradation can be compensated to some extent by inverse filtering, but this can be done only at the expense of noise amplification, so a high initial signal-to-noise ratio (SNR) is required. With compact high resolution optics, however, a high SNR can be obtained only with a very long exposure time, as the focal plane image is very dark. This requires precise image motion compensation during the long exposure interval. This paper shows the enhanced concept of an optomechatromc camera stabilization assembly consisting of a high-speed onboard optical processor for real-time image motion measurement and a 2-axis piezo-drive assembly tor high precision positioning of the focal plane assembly. The proposed concept allows to minimize the size of the optics and the sensitivity to attitude disturbances. The image motion measurement is based on 2D spatial correlation of sequential images recorded from a motion matrix sensor ill the focal plane of the camera. The demanding computational requirements for the real-time 2D-correlation are covered by an embedded optical correlation processor (Joint Transform type).
Opto-mechatronic image stabilization for a compact space camera
Opto-mechatronische Bildstabilisierung für eine kompakte Raumfahrtkamera
2005
6 Seiten, 15 Bilder, 6 Quellen
Conference paper
English
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