Gating and Contrast-Modulation Related to Active Covert Night Photo Systems
AIR FORCE AVIONICS LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
An investigation was made to compare the improvement of contrast modulation for different degrees of gated and non-gated Active Night Photo Systems. Illumination sources and sensor are near the same location. The effects of the atmospheric backscatter on the contrast modulation received by the imaging sensor was determined in steps from a fully gated to a non-gated situation. Characteristic curves were derived for several flight altitudes from 2,000 to 23,000 feet and atmospheric conditions of meteorological visibility of 23 Km and 5 Km representing an upper and a lower limit for the most frequently occurring conditions. Specific regions where the contrast modulation decreases at higher rates are shown.
- Cartography and Aerial Photography
- Infrared Detection and Detectors