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From: "Gary Richardson"
Subject: Re: Extracting time from GSM / mobile phone transmissions?
Date: Fri, 20 Sep 2002 18:58:37 -0700
Organization: Posted via Supernews, http://www.supernews.com
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"Peter" wrote in message
> "client" wrote:
> >The first question is what is *accurate*?
> Within 1 second or so.
> >The second question is the application.
> It is a product which needs to know the time, to the above accuracy.
> It has to be cheap, in so far as I need to get the time receiver part
> to under about US$20.
> GPS is one obvious way but the cost is high. Also the application
> could be indoor and GPS is already way below the noise floor, and I am
> very limited on the antenna size, to a piece of wire about 3" long.
> I think I can use the 60kHz timecode signals, with some clever DSP to
> remove noise. But picking out GSM call setup packets is an interesting
Check out the Atmel U4223B or the Sanyo LA1650. These are the chips used in
so-called 'Atomic' clocks. You certainly won't need a DSP.
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