SATELLITE RADIO-CONTROLLED WRISTWATCH
First Claim
1. A satellite radio-controlled wristwatch, comprising:
- a satellite radio wave reception unit comprising an antenna for receiving a satellite radio wave, a high frequency circuit, and a decoder circuit;
a clock circuit for holding and counting an internal time; and
a controller for controlling timings of at least;
an activation operation of supplying power to the satellite radio wave reception unit for activation thereof;
an acquisition and tracking operation of acquiring and tracking a certain satellite radio wave by the satellite radio wave reception unit; and
a time information acquisition operation of acquiring time information from the satellite radio wave received by the satellite radio wave reception unit,the controller being configured to;
wait for an arrival of an activation time point, which is inversely calculated by subtracting an acquisition and tracking time period and an activation time period from a time information receivable time point that is predicted based on the internal time, and then start the activation operation; and
vary the acquisition and tracking time period depending on a predetermined condition.
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Accused Products
Abstract
In a satellite radio-controlled wristwatch, a time to be spent on acquisition and tracking is reduced and also a reception success probability is increased. A satellite radio-controlled wristwatch according to the present invention includes: a satellite radio wave reception unit including an antenna for receiving a satellite radio wave, a high frequency circuit, and a decoder circuit; a clock circuit for holding and counting an internal time; and a controller for controlling timings of at least: an activation operation of supplying power to the satellite radio wave reception unit for activation thereof; an acquisition and tracking operation of acquiring and tracking a certain satellite radio wave by the satellite radio wave reception unit; and a time information acquisition operation of acquiring time information from the satellite radio wave received by the satellite radio wave reception unit, the controller being configured to: wait for arrival of an activation time point, which is inversely calculated by subtracting an acquisition and tracking time period and an activation time period from a time information receivable time point that is predicted based on the internal time, and then start the activation operation; and vary the acquisition and tracking time period depending on a predetermined condition.
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Citations
8 Claims
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1. A satellite radio-controlled wristwatch, comprising:
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a satellite radio wave reception unit comprising an antenna for receiving a satellite radio wave, a high frequency circuit, and a decoder circuit; a clock circuit for holding and counting an internal time; and a controller for controlling timings of at least; an activation operation of supplying power to the satellite radio wave reception unit for activation thereof; an acquisition and tracking operation of acquiring and tracking a certain satellite radio wave by the satellite radio wave reception unit; and a time information acquisition operation of acquiring time information from the satellite radio wave received by the satellite radio wave reception unit, the controller being configured to; wait for an arrival of an activation time point, which is inversely calculated by subtracting an acquisition and tracking time period and an activation time period from a time information receivable time point that is predicted based on the internal time, and then start the activation operation; and vary the acquisition and tracking time period depending on a predetermined condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification