The propagation of terahertz (THz) band radiation through the atmosphere is a topic of increasing interest as advanced passive and active imaging systems are developed that operate in this spectral region. Much of the impact of the boundary layer atmosphere in this band is due to water vapor absorption, which is very strong even in atmospheric window regions. Most of the effect of atmospheric water vapor is due to the ...
An array of 10 sonic anemometers was used to observe the mean wind and turbulence near an artificial wind barrier at the High Speed Test Track facility on Holloman Air Force Base, NM. In order to test the effectiveness of such barriers in reducing cross-track winds, a prototype barrier was constructed using a polyester screen material rated as providing 30% porosity. The barrier dimensions were 100 m in length and ...
The NATO Research Technology Group 40 (RTG-40) was established in 2003 to develop improved models of active imaging system performance to include the effects of atmospheric optical turbulence. Supporting the development of these models is the performance of naval and land field trials to provide data bases of system performance under varying turbulence conditions. In support of the land trials, the U.S. Army Research Laboratory s (ARL) Computational and Informational ...
Presentation on rules-based and physics-based weather effects and impacts for AWARS. The objective of this presentation is to continue the current implementation of weather effects in the AWARS model using methodologies that improve the estimation of weather impacts in the target acquisition algorithms without increasing AWARS run time.
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