抄録
Navigation with Omega in the capacity of worldwide navigation depends on the following factors: 1) the extreme phase stability of VLF signals propagated over long distances, 2) the ability to predict observed phase differences at any time of day and in any position. The authors attempted to carry out Omega phase difference observations at a fixed location and evaluated the practical value founded on the connection between the measured propagation correction and the theoretically predicted propagation correction. As an example, we observed continuously the phase differences of the A-D pair from February 1, 1974 till February 14, 1975, at the Faculty of Fisheries of Hokkaido University (41゜48'.4N, 140゜43'.3E), and discussed the results.
