Diurnal ambient luminance near dawn and dusk

Grant R. Gerhart; Roy M. Matchko

doi:10.1117/12.276683

20 June 1997 Diurnal ambient luminance near dawn and dusk

Grant R. Gerhart, Roy M. Matchko

Proceedings Volume 3062, Targets and Backgrounds: Characterization and Representation III; (1997) https://doi.org/10.1117/12.276683
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

An operational definition of ambient luminance is described in some detail for the time periods near dawn and dusk. A simple empirical model is developed to predict ambient solar luminance under clear sky conditions as a function of (1) observer azimuth viewing direction, (2) the sun altitude and (3) the sun azimuth. The equation is easily modified for any observer position on the earth, diurnal time period or particular day during the year. The subsequent model predicts ambient solar luminance as a function of time after sunset or before dawn for relative target/solar positions in a real scene. This formalism can be used to extrapolate laboratory observer threshold data to real world environments. Subsequent publications will describe the process for predicting probability of detection as a function of time for various target acquisition scenarios.

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Grant R. Gerhart and Roy M. Matchko "Diurnal ambient luminance near dawn and dusk", Proc. SPIE 3062, Targets and Backgrounds: Characterization and Representation III, (20 June 1997); https://doi.org/10.1117/12.276683

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KEYWORDS

Sun

Eye

Phase modulation

Light scattering

Target acquisition

Target detection

Visualization

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