Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990asee....2.....u&link_type=abstract
In Houston Univ., NASA/ASEE Summer Faculty Fellowship Program, 1990, Volume 2 13 p (SEE N91-27103 18-99)
Astronomy and Astrophysics
Astronomy
Attitude Control, Charge Coupled Devices, Dynamic Models, Image Processing, Optical Measuring Instruments, Space Station Freedom, Space Stations, Star Trackers, Algorithms, Astronomical Photography, Error Analysis, Imaging Techniques, Pixels, Random Noise, Standard Deviation
Scientific paper
Optical rate sensors, in particular CCD arrays, will be used on Space Station Freedom to track stars in order to provide inertial attitude reference. An algorithm to provide attitude rate information by directly manipulating the sensor pixel intensity output is presented. The star image produced by a sensor in the laboratory is modeled. Simulated, moving star images are generated, and the algorithm is applied to this data for a star moving at a constant rate. The algorithm produces accurate derived rate of the above data. A step rate change requires two frames for the output of the algorithm to accurately reflect the new rate. When zero mean Gaussian noise with a standard deviation of 5 is added to the simulated data of a star image moving at a constant rate, the algorithm derives the rate with an error of 1.9 percent at a rate of 1.28 pixels per frame.
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