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A GPS clock, or GPS disciplined oscillator (GPSDO) is a combination of a GPS receiver and a high-quality, stable oscillator such as a quartz or rubidium oscillator whose output is controlled to agree with the signals broadcast by GPS and GNSS satellites.〔http://www.4timing.com/SyncGPS.pdf〕〔(Time and Frequency from A to Z )〕 GPSDOs work well as a source of timing because the satellite signals must be accurate in order to provide positional accuracy for GPS in navigation. These signals are accurate to nanoseconds and provide a good reference for timing applications.〔http://tf.nist.gov/general/pdf/2297.pdf〕〔http://www.rt66.com/~shera/QST_GPS.pdf〕 ==Applications== GPSDOs serve as an indispensable source of timing in a range of applications, and some technology would not be practical without them.〔http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA484160〕 GPSDOs are used as the bases for Coordinated Universal Time (UTC) around the world. UTC is the official accepted standard for time and frequency. UTC is controlled by the Bureau International des Poids et Mesures (BIPM). Timing centers around the world use GPS to align their own time scales to UTC.〔(Agilent | GPS-DO Performance )〕〔http://tycho.usno.navy.mil/ptti/1998/Vol%2030_15.pdf〕 GPS based standards are used to provide synchronization to wireless base stations〔(Time & Frequency )〕 and serve well in standards laboratories as an alternative to cesium based references.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GPS disciplined oscillator」の詳細全文を読む スポンサード リンク
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