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Proceedings Paper

Prediction of apparent horizon elevation under sub- and super-refractive conditions
Author(s): Denis Dion; Michael Duffy
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Paper Abstract

For automatic target detection in maritime environments using optical imaging systems, it may be critical to have a valid a priori knowledge of the elevation of the border between sea and sky backgrounds. In operational conditions, this border, called the horizon, is predicted to move up and down depending on the refractivity conditions. Predictions of horizon elevation can be made from ray-tracing using bulk estimates of refractivity profiles based on the Monin-Obhukov similarity theory. In this paper, predictions of horizon elevations obtained with IRBLEM, a DRDC Valcartier computer model, are compared with observations made in the North Sea in two different meteorological environments: in Katwijk (The Netherlands, October 1993) and Sylt (Germany, June 1992). Good agreement is shown between observations and model calculations. The expected variation of horizon elevation with changing refractivity conditions is discussed.

Paper Details

Date Published: 11 November 2004
PDF: 7 pages
Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, (11 November 2004); doi: 10.1117/12.565137
Show Author Affiliations
Denis Dion, Defence Research and Development Canada-Valcartier (Canada)
Michael Duffy, Defence Research and Development Canada-Valcartier (Canada)

Published in SPIE Proceedings Vol. 5572:
Optics in Atmospheric Propagation and Adaptive Systems VII
John D. Gonglewski; Karin Stein, Editor(s)

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