Re: GPS time synchronization with several Pi's at different locations.


Both warp speed navigation and sub-space communications require much better accuracy. That is one of the first things they teach you at the academy !


On Wednesday, October 16, 2019, 08:12:17 AM CDT, Michael WA7SKG <wa7skg@...> wrote:

Pico-seconds? Seriously? You need something like a $100k+ Cesium-beam
clock to maintain that kind of accuracy. For a $35 computer? Basically
unrealistic if not unobtainium.

I have worked on systems in the past (mostly classified) that required
exceptional time accuracy, but even those were within a couple hundred
microseconds and VERY expensive.

Really curious, however, please explain the purpose of such a beast.
What on earth could possibly require that kind of time accuracy? I
seriously doubt even warp speed navigation or sub-space communications
needs that level of time synchronization.

Michael WA7SKG

Jeff Estal wrote on 10/15/19 6:44 PM:
> I want to synchronize multiple raspberry pi's where each has it's own
> gps device.
> They need to be extremely accurate. Something in the pico seconds range.
> I have a cheap gps-usb device from Amazon and have been recieving data
> from it with python, but the time data only displays seconds always with
> .00 for any portion of the seconds which seems odd.
> How might i approach this?
> Is certain hardware better or worse?
> When data is pulled from a gps device, is there timing considerations as
> to when to get the data or when to store it?
> I"d probably need to also have a realtime clock to update.
> thanks,

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