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Proceedings Paper

Wind Satellite (WINDSAT) Coherent Lidar Pointing System
Author(s): Michael McGuirk
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Paper Abstract

Wind measurement by coherent lidar imposes unique requirements on pointing and image motion compensation systems. Pointing must be accomplished with respect to an inertial frame of reference and image motion compensation must be accomplished at a pupil to maintain heterodyne efficiency. Pupil control considerations become a major optical system driver. Short-term image motion compensation accuracy of 2 microradians and absolute pointing accuracy of 100 microradians are achieved simultaneously with proper pupil control by a simple optical system. Separate servo control systems compensate for altitude and alignment perturbations and provide for fine correction of absolute pointing. S/C velocity leads to a 25 microradian offset in the absolute sample position, but the offsets for transmission and reception cancel, so the image motion compensation system need not account for velocity. Systematic attitude changes couple to the sample direction to determine the extent of image motion. A complete systems analysis will be presented.

Paper Details

Date Published: 3 April 1981
PDF: 7 pages
Proc. SPIE 0265, Shuttle Pointing of Electro-Optical Experiments, (3 April 1981); doi: 10.1117/12.959887
Show Author Affiliations
Michael McGuirk, Perkin-Elmer (United States)

Published in SPIE Proceedings Vol. 0265:
Shuttle Pointing of Electro-Optical Experiments
William Jerkovsky, Editor(s)

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