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AssigneeNippon Telegraph and Telephone Corporation
InventorsTakaaki Hisashima, Hiroki Sakuma, Kaoru Arai, Ryuta Sugiyama, Shunichi Tsuboi, Osamu Kurokawa, Kazuyuki Matsumura
Estimating the term…
A management apparatus in a time synchronization system includes a time variation information receiving unit configured to acquire time variation information and position information of a time synchronization apparatus, a position information classifying unit configured to classify time synchronization apparatuses into predetermined categories based on the acquired position information, a time variation analysis configured to determine majority based on whether patterns of time variation of the time synchronization apparatuses belonging to an identical category are identical to each other, and to analyze the time variation based on the determined results, and a filtering and delivery unit configured to output an instruction to block the time information received from the positioning satellite, to the time synchronization apparatus having abnormal time variation. A GPS-FW includes a filtering determination unit configured to blocks the time information received from a GPS satellite in a case where a block instruction is received from the management apparatus.
A time synchronization system comprising:
A time synchronization method in a management apparatus of a time synchronization system including a plurality of time synchronization apparatuses, each of the plurality of time synchronization apparatuses being configured to receive a radio wave from a positioning satellite and to take time synchronization using time information included in the received radio wave as a time source to deliver a time, the method comprising:
A non-transitory computer-readable medium storing software comprising instructions executable by one or more computers which, upon such execution, cause the one or more computers to perform operations comprising:
Dependencies are inferred from the claim text.