[time-nuts] GLONASS receiver

Bob Camp lists at rtty.us
Sun Aug 5 17:45:43 EDT 2012


Hi

What sort of accuracy do you need? If 1 ms is "good enough", then indeed a GPSDO would keep you running through a pretty long outage. Most are designed for a 1 us / day sort of stability. You should be able to run for a few months without GPS access with one in holdover. 

Bob

On Aug 5, 2012, at 5:36 PM, Miguel Gonçalves <m at mbg.pt> wrote:

> Hi there!
> 
> I currently have 2 embedded machines connected to a Garmin 18 LVC and a Sure GPS board.
> 
> They are NTP servers for my company's LAN and I, at the moment, I get sub-ms accuracy over the LAN.
> 
> Everything is fine but I am a bit worried about the GPS reliability because GPS is ruled by the USA. Would a GPS disciplined oscillator solve any potential problems? A receiver for GLONASS, even though I did not find any at a reasonable price, would be better?
> 
> An iridium oscillator calibrated, regularly by GPS?
> 
> Too many questions... but in the end I would like to know what is the best path that I could follow after these GPS receivers.
> 
> Many thanks!
> 
> Regards,
> Miguel
> 
> 
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