Abstract

The optical performance of near-horizon viewing infrared airborne sensors is affected by atmospheric variations along the line of sight, which are associated with (a) ambient atmospheric vertical structure and turbulence, and (b) the aircraft boundary layer. We have modeled systematic (non-fluctuating) errors and random variations in line-of-sight (LOS) angle and target intensity for several MWIR and LWIR wavelengths as a function of LOS elevation angle from a high altitude aircraft-borne sensor. A range of atmospheric temperature, density, and structure models was used to investigate the sensitivity of target scintillation, jitter angle, and image spread effects to altitude.

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