DocumentCode :
984183
Title :
The effect of waveguide dispersion on VLF timing systems
Author :
Crombie, D.
Author_Institution :
Institute for Telecommunication Sciences and Aeronomy, Boulder, CO, USA
Volume :
15
Issue :
2
fYear :
1967
fDate :
3/1/1967 12:00:00 AM
Firstpage :
322
Lastpage :
323
Abstract :
It is shown that VLF timing and navigation systems, which use two or more frequencies to resolve cycle ambiguities, may be in error when the propagation mechanism is dispersive. The error arises if the difference between group and phase velocity in such cases is neglected. At 10 kHz the error on a path 10 000 km long, for a reasonable daytime model of the earth-ionosphere waveguide, may be as much as 400 
s for the first-order mode. If the second-order mode is dominant as it may be at night the error will be greatly increased.
s for the first-order mode. If the second-order mode is dominant as it may be at night the error will be greatly increased.Keywords :
Dispersive channels; Earth-ionosphere waveguide; VLF radio propagation; Absorption; Clocks; Dispersion; Equations; Frequency measurement; MONOS devices; NIST; Radio transmitters; Timing; US Department of Commerce;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1967.1138889
Filename :
1138889
Link To Document :
