Wind Satellite (WINDSAT) Coherent Lidar Pointing System

Michael McGuirk

doi:10.1117/12.959887

3 April 1981 Wind Satellite (WINDSAT) Coherent Lidar Pointing System

Michael McGuirk

Proceedings Volume 0265, Shuttle Pointing of Electro-Optical Experiments; (1981) https://doi.org/10.1117/12.959887
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

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.

Citation Download Citation

Michael McGuirk "Wind Satellite (WINDSAT) Coherent Lidar Pointing System", Proc. SPIE 0265, Shuttle Pointing of Electro-Optical Experiments, (3 April 1981); https://doi.org/10.1117/12.959887

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