Sea Surface Infrared Radiance Simulator – Part 2: Sky radiance and trailing wake integration

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Authors
  1. Issa, V.
  2. Daya, Z.A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
In a previous paper, we developed a sea surface radiance simulator (SSRS) for modeling and simulating the sea surface radiance of the ambient sea surface in the infrared. In this report, we present two additional models in our simulator. A sky radiance model based on third party software ShipIR and atmospheric propagation software MODTRAN are incorporated to include a realistic distribution of sky radiance. A model of the turbulent wake roughness and temperature spatial variation are presented and a model of the turbulent wake radiance is implemented in our simulator. Our results show that the sea surface radiance is highly affected by the receiver position. In the turbulent wake, decreasing the receiver zenith angle decreases the reflected sky radiance on the sea surface and increasing the receiver zenith angle will decrease the thermal emitted sea surface radiance. This strong dependence results in positive or negative wake contrast radiances at different receiver angles.

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Keywords
sea surface reflectivity;sea surface emissivity;sea surface roughness;infrared sea radiance;sky radiance;trailing wake;Kelvin wake;turbulent wake
Report Number
DRDC-ATLANTIC-TM-2011-325 — Technical Memorandum
Date of publication
01 Aug 2012
Number of Pages
40
DSTKIM No
CA045220
CANDIS No
805613
Format(s):
Electronic Document(PDF)

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