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.
Enhanced detection of LED runway/approach lights for EVS
Enhanced and Synthetic Vision 2008 ; 2008 ; Orlando,Florida,United States
Proc. SPIE ; 6957
2008-04-04
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Enhanced detection of LED runway/approach lights for EVS [6957-02]
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