オメガ信号のcycle jump-II

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書誌事項

タイトル別名
  • Cycle Jumps of the OMEGA Signals Observed in Japan
  • オメガ信号のcycle jump-2-
  • オメガ シンゴウ ノ cycle jump 2

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説明

The characteristics of the cycle jump (rapid phase change in one cycle unit) in the OMEGA signals were studied with the three years observations in Japan during the years from 1975 to 1977. Statistical results of OMEGA signal gave the many useful information to improve the navigational accuracy. These studies will be revealed as follows: 1) According to the general features of every signals, cycle advance occurred in both sunset transition and nighttime, and cycle slip in sunrise only. 2) Occurrence number of cycle jump of OMEGA Hawaii slightly increased in accordance with the receiving site moves to westward in Japan. For example, occurrence percentage in the year was 1% in Tokyo and 6% at Hiroshima. To the contrary, the results obtained in the southern district were highly notified as compared with ones in the northern district above mentioned, that is 22% at Kagoshima and 33% at Okinawa. Consequently, the 10.2kHz OMEGA Hawaii in Japan should be comfirmed for usable range in magnetic latitude 25゜, geographic 3.5゜. 3) No cycle jumps in both 10.2kHz and 13.6kHz at night during April to October through the observations. Moreover, in 10.2kHz, cycle jump in the transit time showed the annual change. 4) The signal of OMEGA Norway and North Dakota propagated through the high latitudes do not showed any jumps in Japan except Kagoshima.

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