船上での時刻整合及び時刻改正作業の自動化

概要

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It is necessary for onboard time management that Marine clock is adjusted to UTC at all times and various equipments are corrected to local time when standard meridian is changed. But these affairs are inconvenience to mariners, because each equipment is practically set by hand. The authors designed and tested the marine master clock with PPS (Pulse Per Second) signal and the Local Time Information (LTI) software on Windows OS. The PPS signal is outputted by hi-precision control clock, such as GPS, Radio controlled clock etc. The marine master clock is available to drive some ordinary marine slave clocks. The LTI software consist a master and many clients, use some transfer mode TCP and UDP (also broadcast mode). The results are as follows. 1) Proposed marine clock synchronized to UTC automatically, and the slave clocks are derived certainly. The synchronous precision is 13ms in standard deviation. 2) Local time of navigational GPS is set all computers by the Auto-time correction program via shipboard LAN.
2005-03-25