27 July 1981 Autonomous Star Cataloging For Space Surveillance Missions
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Proceedings Volume 0280, Infrared Astronomy: Scientific/Military Thrusts and Instrumentation; (1981) https://doi.org/10.1117/12.931960
Event: 1981 Technical Symposium East, 1981, Washington, D.C., United States
Autonomous stellar-reference attitude updates can be obtained by the use of an infrared sensor system's capability of generating dense and accurate infrared-star catalogs. Existing lists of stellar objects, such as the Two-Micron Sky Survey and the AFGL-Four-Color-Infrared Sky Survey, provide stellar densities of about 0.1 star/deg2 at galactic latitudes greater than 30 degrees with a star threshold spectral irradiance of approximately 7 x 10-16 W-cm-2-μm-1. This results in waiting times for new updates of up to 30 minutes in regions of the celestial sphere where the stellar density is low. IR.-CCD mosaic surveillance sensors can detect stellar sources with much lower thresholds and thus generate their own high-density star catalog. The accuracy of CCD-mosaics for a single star sighting is only 1/2 pixel in width, but this is improved by recurrent sightings of the same star and by blurred-image-centroiding algorithms. Precision centroiding is discussed in terms of primary functions and theoretical performance limits. Performance variations with algorithm complexity, blur circle size, and number of sightings are presented.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Westheimer, N. Westheimer, W. H. Haas, W. H. Haas, } "Autonomous Star Cataloging For Space Surveillance Missions", Proc. SPIE 0280, Infrared Astronomy: Scientific/Military Thrusts and Instrumentation, (27 July 1981); doi: 10.1117/12.931960; https://doi.org/10.1117/12.931960


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