[ntp:questions] Accuracy of GPS satellite signal ?

Richard B. Gilbert rgilbert88 at comcast.net
Sun Jan 28 15:59:47 UTC 2007


John Allen wrote:

> Richard B. Gilbert wrote:
> 
>> It should not matter which satellites your site is using, they all 
>> keep the same time to within nanoseconds!
> 
> 
> To satisfy my curiosity without effort on my part, can someone tell me 
> where the GPS satellites actually get their time from?
> 
> John
> 
> 
> -- 
> 
> John Allen
> Bofferdange, Luxembourg
> allen{at}vo{dot}lu
> http://www.homepages.lu/allen

The Navstar (GPS) satellites have atomic clocks (cesium) on board. 
These clocks are monitored and controlled by a ground station.




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