REFRACTION EFFECTS ON EO SYSTEM DETECTION RANGES IN COASTAL ENVIRONMENTS

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Authors
  1. Dion, D.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Atmospheric refraction can significantly affect the detection range performances of electro-optical (EO) systems against low-level targets in coastal environments. Negative air-sea temperature difference (ASTD) conditions, which produce subrefraction, impose an absolute limit of detection range shorter than the terrestrial horizon, while positive ASTD conditions, which produce superrefraction, allow radiation to propagate beyond the horizon. For subrefraction conditions, an approximate formula is given for estimating the detection range limit as a function of ASTD, wind speed and sensor-target elevations. Under superrefraction, the detectability is degraded by the refraction-induced ray spreading near the sea surface. This refraction loss, which depends on the weather conditions and the sensor-target elevations, is discussed.
Report Number
AGARD-CP-567-PAP-15 — CONTAINED IN 95-04787
Date of publication
01 Feb 1995
Number of Pages
9
DSTKIM No
95-04762
CANDIS No
151970
Format(s):
Document Image stored on Optical Disk

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