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Relative-datum Loran navigationFor short range navigation around an airport, there are operational and computational advantages in changing the reference frame for Loran navigation of the normal latitude-longitude frame to a tangential local reference plane. This is called ""Relative Datum Loran Navigation'' since it is centered at a selected reference point (such as a runway touchdown point) whose time differences (TD's) in a given Loran grid accurately surveyed. If the receiver TD's are related to this datum to produce a relative TD (delta TD), the computation of its position in the x,y local reference plane can be computed easily using two linked linear equations which have four known constant coefficients. The TD's of all touchdown points and these four coefficients in order to provide x,y in local reference planes related to each runway can be stored.
Document ID
19840003039
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Elias, A.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1983
Publication Information
Publication: NASA. Langley Research Center Joint Univ. Program for Air Transportation Res.
Subject Category
Aircraft Communications And Navigation
Accession Number
84N11107
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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