Mathematics – Logic
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nosc.rept.....p&link_type=abstract
Final Report, Oct. 1990 - Sep. 1991 Naval Ocean Systems Center, San Diego, CA.
Mathematics
Logic
Horizon, Light Transmission, Oceans, Optical Tracking, Ray Tracing, Refraction, Refractivity, Ships, Coasts, Low Altitude, Proving, Telescopes
Scientific paper
The effects of refraction on optical propagation at low altitudes over the ocean were investigated. A telescope was used to optically track ships to the range at which they disappeared over the horizon. Concurrent bulk meteorological measurements were used with surface-layer theory to model optical refractivity. A ray-trace program, with these profiles of refractivity, was used to calculate maximum intervision range (MIVR). Calculated MIVRs agree well with observations for subrefractive conditions (air cooler than water) typical of the open ocean. Agreement is not as good for super-refractive and ducting conditions (air warmer than water), which occurred with offshore flow and are therefore not typical of open ocean. Optical ducting conditions also appear to vary with range, such that point meteorological measurements and homogeneous ray tracing are not representative.
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