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http://dx.doi.org/10.9766/KIMST.2018.21.3.306

A Study on the Characteristics of Sunglint in LongWave InfraRed Band  

Kim, Kyung Ha (The 1st Research and Development Institute, Agency for Defense Development)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.21, no.3, 2018 , pp. 306-314 More about this Journal
Abstract
In maritime environment, it is necessary to understand the characteristics of sunglint since it may degrade the target detection performance of the infrared sensor mounted weapons. In this paper, sunglint in LWIR band is modeled using the slope distribution of the sea surface, and is verified by comparing the radiance of a simulated result with that of the real world. According to the simulation, sunglint is critical when the solar zenith angle is over $60^{\circ}$. The peak radiance of sunglint grows as the solar zenith angle increases until it reaches $83^{\circ}$ and has a large difference depending on the solar zenith angle when the wind speed is small. Finally, seasonal and temporal characteristics of sunglint effects are analyzed. In summer, sunglint is dominant in the horizon near the solar azimuth right after sunrise and before sunset. However, in winter, the influence of sunglint lasts even during the daytime since the elevation of the sun is much lower than in summer.
Keywords
Sunglint; Maritime; LWIR;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Kyoung-Soo Kim et al., "A Study on Long-Wave Infrared Sea Surface Signature," KIMST Annual Conference Proceedings, pp. 823-824, 2014.
2 Hyeryeong Park, “Implementation of Virtual Maritime Environment for LWIR Homing Missile Test,” Journal of the Korea Institute of Military Science and Technology, Vol. 19, No. 2, pp. 185-194, 2016.   DOI
3 Sung-Kun Jang et al., "Analysis of the Infrared Image Property with Respect to the Variation of Time and Wavelength," IEEK Conference Proceedings, pp. 1040-1041, 2009.
4 C. Cox, and W. Munk, “Measurement of the Roughness of the Sea Surface from Photographs of the Sun’s Glitter,” J. Opt. Soc. Am., Vol. 44, No. 11, pp. 838-850, 1954.   DOI
5 F. M. Breon, and N. Henriot, "Spaceborne Observations of Ocean Glint Reflectance and Modeling of Wave Slope Distributions," J. Geophys. Res., Vol. 111, C06005, pp. 1-10, 2006.
6 A. T. Mecherikunnel, and J. C. Richmond, "Spectral Distribution of Solar Radiation," NASA Technical Memorandum 82021, Greenbelt, Goddard Space Flight Center, 1980.
7 D. Freund et al., “Numerical Computations of Rough Sea Surface Emissivity using the Interaction Probability Density,” J. Opt. Soc. Am. A., Vol. 14, No. 8, pp. 1836-1849, 1997.   DOI
8 C. Schlick, "An Inexpensive BRDF Model for Physically-based Rendering," Computer Graphics Forum, Vol. 13, No. 3, pp. 233-246, 1994.
9 G. Hale, and M. Querry, “Optical Constants of Water in the 200-nm to 200-um Wavelength Region,” Appl. Opt., Vol. 12, No. 3, pp. 555-563, 1973.   DOI
10 D. M. Gates, and W. J. Harrop, “Infrared Transmission of the Atmosphere to Solar Radiation,” Appl. Opt., Vol. 2, No. 9, pp. 887-898, 1963.   DOI
11 Kyung Ha Kim et al., "A Study on Sunglint in LWIR Band using the Slope Distribution of the Sea Surface," KIMST Annual Conference Proceedings, pp. 323-324, 2016.
12 C. R. Zeisse, “Radiance of the Ocean Horizon,” J. Opt. Soc. Am. A, Vol. 12, No. 9, pp. 2022-2030, 1995.   DOI
13 Huijie Zhao et al., “Mid-Infrared Imaging System based on Polarizers for Detecting Marine Targets Covered in Sun Glint,” Optics Express, Vol. 24, No. 15, pp. 16396-16409, July, 2016.   DOI
14 Fondriest Environment, Inc., "Solar Radiation and Photosynthetically Active Radiation," Fundamentals of Environmental Measurements, 21 Mar. 2014. Web. http://www.fondriest.com/environmental-measurements/parameters/weather/solar-radiation/.