Modest-cost proximity warning indicator suitable for use by general aviation and larger aircraft, is based on listening to transponder replies from nearby aircraft with suitable filtering to minimize false-alarms. First proposed in 1968, it now has expanded capabilities.
Beacon proximity warning unit outlined
Aviation Week and Space Technology ; 95 , 12 ; 74
1971
, 3 Bilder
Article (Journal)
German
FLUGZEUG , RADAR , VERHUETUNG , WARNSYSTEM
British Library Conference Proceedings | 2001
|Engineering Index Backfile | 1928
|Curtiss national system outlined
Engineering Index Backfile | 1928
|