Omega Navigation Signal Characteristics

Peter B. Morris, Radha R. Gupta

Abstract:	A description of Omega/VLF signal propagation is given. Particular emphasis is given to "non-standard" signal propagation scenarios including propagation over regions of low ground conductivity, signal spreading and converging, antipodal effects and long-path reception, modal interference (including fast terminator transit and off-path effects), and temporal anomalies (SIDs, PCAs, and magnetic storms. These elements of signal behavior are described qualitatively to aid in understanding the basis for signal selection algorithms employed in conventional Omega/VLF receiving systems. Equipped with this knowledge, the user may invoke manual deselection procedures when the receiver is suspected of processing an undesirable signal, i.e., one likely to produce significant navigational error. As further guidance. a table of recommended signal deselections is given for approximately 80 geographic locations around the earth. Signals are recommended for deselection on the basis of modal interference. long-path reception, and solar proton activity.
Published in:	Proceedings of the 43rd Annual Meeting of The Institute of Navigation (1987) June 23 - 25, 1987 Dayton, Ohio
Pages:	57 - 64
Cite this article:	Morris, Peter B., Gupta, Radha R., "Omega Navigation Signal Characteristics," Proceedings of the 43rd Annual Meeting of The Institute of Navigation (1987), Dayton, Ohio, June 1987, pp. 57-64.
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