| 摘要 |
PURPOSE:To always execute an exact measurement irrespective of the dissipation of a radio wave, by moving the tracking pulse of all loran stations to a normal tracking position and starting a tracking at the time of resetting the radio wave, when the radio waves of all the loran stations are dissipated. CONSTITUTION:A loran C radio wave is received by a receiving circuit 12 through an antenna 10, calculated by a receiving position arithmetic circuit 14, and from a calculating position selecting circuit 22, a position data is outputted. When a radio wave dissipation is confirmed by a receiving state monitoring circuit 22, a normal tracking point is presumed with regard to each loran station by sampling timing arithmetic circuits 26, 28. In the receiving circuit 12, when those sampling timings are given, a sampling pulse is moved to each normal tracking point, and also, a tracking operation of all loran stations is started.
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