Importance

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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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First Claim