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Proceedings Paper

Diurnal variations in multiple optical ground-site availability
Author(s): David A. Nahrstedt
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Paper Abstract

Results are presented for diurnal and seasonal variations in availability for multiple optical ground sites within the Hawaiian Islands. The probability of at least one site available, given one, two and three sites to select from, is modeled. Availability is based on the requirement to simultaneously satisfy constraints on probability of cloud-free line-of-sight and operational thresholds for relative humidity and wind speed. These affect optical coating performance and life, and pointing accuracy, respectively. Modeling techniques are also described for maintaining consistency in the accuracy and fidelity of the atmospheric models in the absence of long-term or site-specific measurements. The results show that availability varies dramatically with time-of-day, and is significantly improved when the number of sites considered increases from only one to two. The analysis also shows that the net effect of wind speed and humidity as a function of time-of-day is not intuitive. The results are applicable to space object imaging, and ground-to-space laser communications and energy projection.

Paper Details

Date Published: 30 April 2003
PDF: 13 pages
Proc. SPIE 4976, Atmospheric Propagation, (30 April 2003); doi: 10.1117/12.479206
Show Author Affiliations
David A. Nahrstedt, Boeing Co. (United States)

Published in SPIE Proceedings Vol. 4976:
Atmospheric Propagation
Cynthia Y. Young; John S. Stryjewski, Editor(s)

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