Combined Vision System
using EVS and SVS |
With over 20 years of EFVS research and flight testing, the MADL developed two technologies, the enhanced vision system (EVS) and the synthetic vision system (SVS), and then combined the two to create a technology that would allow pilots to fly in near all weather conditions.
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An Enhanced Vision System incorporating a low cost Head Up Display will enable more General Aviation airports to accommodate many more aircraft during low visibility conditions. Enhanced vision systems use a frequency of energy that is invisible to the human eye in order to penetrate fog and haze. This enables the pilot to see the airport runway environment overlaid on the Head Up Display. Most EVS sensors rely on very small differences in the natural non-visible heat that is radiated by living and non-living material. This is known as infrared sensing. Other EVS sensors may use energy in the microwave radio band, for example, the millimeter-wave radar sensor. Civil aviation most commonly uses infrared imagery.
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URF's Synthetic Vision System creates a digital terrain for the pilot when the ground is not visible. SVS also can create a Highway-In-The-Sky (HITS) guidance symbology to give the pilot additional guidance cues to the flight path, somewhat like flying on a virtual highway, or through a tunnel in the sky. The picture on the left shows URF flight testing of the Highway-In-The-Sky (HITS) on our C402B HUD with a combined EVS and SVS in March 2005. |
Airspace Visualization
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