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  2. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    Radio clock. Not to be confused with clock radio, an alarm clock incorporating a broadcast radio receiver. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an " atomic clock ", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio ...

  3. GPS disciplined oscillator - Wikipedia

    en.wikipedia.org/wiki/GPS_disciplined_oscillator

    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 or other GNSS satellites. [1] [2] GPSDOs work well as a source of timing because the satellite time signals ...

  4. Marine chronometer - Wikipedia

    en.wikipedia.org/wiki/Marine_chronometer

    Chronometer circa 1844-1860. A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

  5. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...

  6. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    GPS observation processing must also compensate for the Sagnac effect. The GPS time scale is defined in an inertial system but observations are processed in an Earth-centered, Earth-fixed (co-rotating) system. A coordinate transformation is thus applied to convert from the inertial system to the ECEF system.

  7. Clock synchronization - Wikipedia

    en.wikipedia.org/wiki/Clock_synchronization

    Clock synchronization. Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates.

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