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From: Peter Gsellmann
Subject: Re: Extracting time from GSM / mobile phone transmissions?
Date: Thu, 19 Sep 2002 21:50:45 +0200
NNTP-Posting-Host: dialup138.d1-nik1.grz.at.kpnqwest.net (22.214.171.124)
> 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).
There are precise radio time signals at several frequencies: 77.5 kHz
(DCF-77 in europe) 10.000 MHz (and some other stations in the shortwave
range) and even your local radio stations frequency is accurate.
Why is GPS not possible? the sattellites carry some sort of atomic clock!
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