Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9810769c&link_type=abstract
Masters Thesis, INPE-6682-TDI/627
Other
Fabrication, Product Development, Attitude Control, Accuracy, Errors, Measuring Instruments, Ccd Cameras, Telescopes, Pixels, Lenses, Interpolation, Distance, Coordinates, Constellations, Catalogs (Publications), Brightness, Algorithms
Scientific paper
In this work, it is described the development of the SUE stellar sensor, an instrument based on a CCD camera and capable of determining the pointing coordinates with an error smaller than 0.5 arcminute. This instrument is part of the attitude control system of the MASCO telescope. It acquires an image of the sky every second, recognizes the most brilliant stars in the image, creates with them a "constellation", and searches for this pattern in a catalog of the observed region. In its basic configuration, the stellar sensor is able to detect stars up to magnitude 3.2. The searching algorithm is based on the analysis of the geometrical configuration of the "constellation" and considers the distances and angles between the stars and their relative brightness as well. The stellar sensor, consisting in a CCD camera coupled to a telephoto lens, digitizes the images at 512 x 400 pixels resolution. Two configurations have been tested: one with a zoom lens (18 to 108 mm) and another with a fixed focus lens (70 mm). The camera observes a region of approximately 6 x 5 degrees in the sky, corresponding to a resolution, given by the number of pixels of the sensor, of approx. equal 45 arcseconds. The implementation of interpolation algorithms allowed an accuracy in the determination of the pointing coordinates of 1/10 of a pixel or, equivalently, a few arcseconds. The tests carried out with this sensor showed the following results: dispersion smaller than 4 arcseconds in the determination of the position of the stellar images, 100% of correct matching of the point patterns in more than 1500 images and error dispersion in the determination of the pointing coordinates smaller than 30 arcseconds.
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