Development of precise time device.
A time device, since such a unit did not exist, has been newly developed with the ability to permit exact synchronization of the times of two clocks installed at very remote sites to 土0.1 μs. The conventional time device has a weak point in relation to the difficulty of defining the delays of signals in the whole receiving system including the cycle correction of sampling points in comparison with clocks using Loran C waves. In a clock comparison based on the developed time device, a Loran C pseudo signal which has a fixed relation to the clock signal is generated at the receiving station, to the clocks are indirectly compared with each other through the generated signal by an ordinary hyperbolic navigation receiver. Therefore, the signal delays in the receiving system are cancelled since the two signals to be compared pass through the same receiving system and thus the possibility of error does not exist. To check the accuracy of the developed time device, the time of the related new device concerned was set to “UTC” based on the writer’s method and the time set point was compared three times with one of UTC TAO (Tokyo Astronomical Observatory). As a result, it was verified that the desired setting accuracy of 土0.1μs was satisfactorily cleared. This time device was fabricated for international co-observation based on laser geodetic survey of the laser geodetic satellite “LAGEOS” by which the Maritime Safety Agency originally started to prove the relationship between the local and world geodetic systems since 1982. Currently, the time device is performing in a stable manner at the Shimosato Hydrographic Observatory. Key words: Time determination, Time comparison of Loran C wave, International Clock comparison.
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1983
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| Online Access: | http://hdl.handle.net/1834/16225 |
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