[time-nuts] time-nuts Digest, Vol 104, Issue 37

[James Peroulas]

>
> Date: Sun, 10 Mar 2013 17:37:13 -0700
> From: gary <lists at lazygranch.com>
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] frequency reference for portable operation
> Message-ID: <513D2739.8030107 at lazygranch.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I haven't researched this yet, but the SDR crowd is using GSM and LTE
> for tuning their sample clocks.
>
> > https://github.com/steve-m/kalibrate-rtl
> > https://github.com/Evrytania/LTE-Cell-Scanner
>
>
> I have no idea what kind of accuracy you can get from a tower.
>

GSM and LTE (and WCDMA and TD-SCDMA for that matter) are spec'd for 50 PPB
accuracy. However, these networks are 'often' synchronized to an external
reference which would presumably be GPS. This would give better long term
accuracy, but the short term accuracy would depend on the actual
implementation of the basestation.

JP

P.S. I'm the author of LTE-Cell-Scanner.