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4 April 2008 Enhanced detection of LED runway/approach lights for EVS
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The acquisition of approach and runway lights by an imager is critical to landing-credit operations with EVS. Using a GPS clock, LED sources are pulsed at one-half the EVS video rate of 60 Hz or more. The camera then uses synchronous (lock-in) detection to store the imaged lights in alternate frames, with digital subtraction of the background for each respective frame-pair. Range and weather penetration, limited only by detector background shot-noise (or camera system noise at night), substantially exceed that of the human eye. An alternative is the use of short-wave infrared cameras with eyesafe laser diode emitters. Also, runway identification may be encoded on the pulses. With standardized cameras and emitters, an "instrument qualified visual range" may be established. The concept extends to portable beacons at austere airfields, and to see-and-avoid sensing of other aircraft including UAVs.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Richard Kerr "Enhanced detection of LED runway/approach lights for EVS", Proc. SPIE 6957, Enhanced and Synthetic Vision 2008, 695703 (4 April 2008);


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