Subject: Re: Extracting time from GSM / mobile phone transmissions?
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Date: Thu, 19 Sep 2002 14:48:47 -0400
NNTP-Posting-Date: Thu, 19 Sep 2002 14:43:24 EDT
Organization: Primus Canada
The first question is what is *accurate*?
The second question is the application.
1) You need precise deltaT, and general info about "time"
Take time from a GPS and call it T0. Start a fast counter at T0
and record number of ticks at T1, T2......
2) There are events at two measuring places, for example 2 airplanes,
and you need to know when events happened.
Again you can use fast counters, that you triger on land prior to
Number of ticks are time of an event.
If you provide more information, maybe someone would have the solution.
"Peter" wrote in message
> I have in the past asked about a cheap way of extracting *accurate*
> time from GPS (not possible), or timecode signals (possible).
> What about doing it from mobile phone signals. These are everywhere in
> the developed world, although AFAIK the standards differ between e.g.
> the USA and Europe.
> Also this needs to work in a light aircraft, say 20000ft, so the
> reception might not be too great.
> Is it easy to extract the time from this type of signal? Presumably
> one would be listening to the base stations rather than the phones
> (more power).
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