Passive ground-based radio-interferometry systems (RILS) monitor local air traffic by determining aircraft position in planes defined by surveillance area. Similar RILS arrangements are used to determine aircraft positions in three dimensions when combined with azimuth and range information obtained by radar. Information helps determine three-dimensional aircraft position without expensive encoding altimeters.
Air-traffic surveillance systems
NASA Tech Briefs ; 3 , 3
1979-01-01
Miscellaneous
No indication
English
NTRS | 1982
Tema Archive | 1977
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