Probabilistic modelling of LORAN-C for non-precision approaches
Author(s)
Einhorn, John Kenneth
DownloadFTL_R_1985_05.pdf (9.642Mb)
Alternative title
Loran-C for non-precision approaches, Probabilistic modelling of
Other Contributors
Massachusetts Institute of Technology. Flight Transportation Laboratory
Metadata
Show full item recordAbstract
A mathematical model of the expected position errors encountered from LORAN-C during a non precision approach was formulated. From this, position error ellipses were generated that corresponded to two time difference correction schemes. One involved relaying corrections to the pilot just before he initiated the approach, and the other involved publishing time difference corrections in the instrument approach plates. It was found that the errors associated with both update scenarios were well within FAA AC90-45A accuracy standards for non precision approaches. The former scenario showed a significant improvement over the latter. Flight tests were conducted in a general aviation airplane carrying an equipment test bed designed to take data from a LORAN-C receiver and an ILS localizer receiver. The results of the flight tests show that the LORAN-C had a maximum error (average plus one standard deviation) of 1.276 degrees deviation from the localizer path, and an average error (average plus one standard deviation) of .648 degrees. It is concluded that LORAN-C is a suitable navigation system for non precision approaches and that time difference corrections made every eight weeks in the instrument approach plates will produce acceptable errors.
Description
June 1985 Also issued as an M.S. thesis, Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985 Includes bibliographical references (p. 272)
Date issued
1985Publisher
Cambridge, Mass. : Massachusetts Institute of Technology, Flight Transportation Laboratory, [1985]
Other identifiers
13355757
Series/Report no.
FTL report (Massachusetts Institute of Technology. Flight Transportation Laboratory) ; R85-5
Keywords
Loran, Testing