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Satellites send a signal and users’ receptor receives it. But in order to read the signal properly, both clocks (the satellites and the receptor’s) must have the same time scale.
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Clock synchronization with Global Navigation Satellite Systems (GNSS) involves comparing the time kept by a GNSS receiver with the time signal sent by the GNSS satellites. The receiver uses the time difference between the two to calculate its position and velocity. The receiver also includes a clock that can be synchronized with the satellite time signal to improve its accuracy. This is done by comparing the time offset between the satellite and receiver clocks, and adjusting the receiver clock to match the satellite clock.
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[](https://www.bodet-time.com/time-servers/articles-and-resources/1595-why-is-time-synchronization-so-important.html)
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