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Air-traffic surveillance systemsPassive 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.
Document ID
19780000313
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Macdoran, P. F.
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Publication Information
Publication: NASA Tech Briefs
Volume: 3
Issue: 3
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-14173
Accession Number
78B10313
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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