| 摘要 |
PURPOSE: A timing calculation method is provide to derive an accurate global positioning satellite(GPS) by calculating a frame boundary, while GPS timing is set as a reference. CONSTITUTION: In the device, time is calculated by determining a time difference Δt between the GPS reference time (or a pulse) and an n-th frame boundary. The time difference Δt and a frame boundary identifier are supplied to all devices or a part of devices equipped with GPS receivers. So , the device equipped having the GPS itself be made to be synchronized with the GPS timing. When the device is synchronized with the GPS timing, it retrieves a GPS signal, by using information from a geographical position server, such as a WAG server.
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