RESEARCH ON THEORETICAL STUDIES OF THE STATISTICAL CHARACTERISTICS OF SUNLIT CLOUDS, VOLUME I
PHILCO NEWPORT BEACH CA AERONUTRONIC DIV
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The work discusses the reflectivity of solar infrared from high altitude clouds, and the effect of the energy reflected from these clouds on the statistical performance criteria of a satliteorne mssile detection system. The scattering of infrared from clouds of sperical water droplets has been treated by theory. For wavelengths in the range 2.5 - 10 micron, and for large angle scattering the effective reflectivity is due to single rather than to multiple scattering by water droplets. The effective diffuse reflectivity under these conditions is of the order of 1 - 2 percent. For actual situations, some discussion has been given of atmospheric transmission losses as well as of meteorological data on the distribution of high altitude clouds. The statistical problem consists of the detection of rare high ancignal in a background having occasional high radiance levels. The detection criterion thus involves maximizing peak rather than mean signal-to-noise raos. n anysis terof llihoratiis developed, and it is shown that th Neyman-Pearson criterion provides a usable partial maximization of signal detection probability.