Doesn't make sense to me: 1. The NTP server only needs the time signal, not the location (which requires 4 satellites to be accurate), so even a signal from a single satellite should be sufficient. 2. "getting a signal lock" is mostly a matter of having an up to date satellite position almanac and recent location (within hundreds of kilometers) in order to find the 4 required satellites. Finding the first satellite is usually very quick. 3. Once the phone knows where it is, it's capable of keeping track of a car moving at over 100 km/h for hours in order to update Google Maps and friends. So the "keeping up" part is a solved problem, even if it was an issue for the context of this thread.
Besides - the information should be there (the accurate time is a crucial part of the positioning process). The main question from where I stand now is how does Android provide access to the information (which API and was it added to the multitude of reference clocks that the standard NTP software comes with). --Amos On 8 May 2014 15:20, E.S. Rosenberg <esr+linux...@g.jct.ac.il> wrote: > One possible explanation may be that due to the very hard time cellphones > have to get and maintain GPS locks (which is the reason we have > technologies like AGPS) makes it impractical.... > > > 2014-05-08 14:43 GMT+03:00 Amos Shapira <amos.shap...@gmail.com>: > >> I posted a question in >> http://android.stackexchange.com/questions/68996/using-android-gps-as-ntp-refclock >> >> >> On 8 May 2014 10:56, geoffrey mendelson <geoffreymendel...@gmail.com>wrote: >> >>> On 5/8/2014 10:49 AM, Amos Shapira wrote: >>> >>>> Yeah I'm with you about taking advantage of the phone's GPS signal to >>>> get a good clock, and I thought that this is what this time-server thing >>>> does. What does it do if not that? >>>> >>> >>> The one I saw was just an Android port of the standard NTP server, which >>> syncs to other NTP servers. >>> >>> >>>> It's weird that nothing does it yet. Any takers? >>>> >>>> >>> My opinion too. >>> >>> I'd settle for an RS232 serial emulation over USB of the old GPSs. :-) >>> >>> >>> Geoff. >>> >>> -- >>> Geoffrey S. Mendelson 4X1GM/N3OWJ >>> Jerusalem Israel. >>> >>> >> >> >> -- >> [image: View my profile on LinkedIn] >> <http://www.linkedin.com/in/gliderflyer> >> >> _______________________________________________ >> Linux-il mailing list >> Linux-il@cs.huji.ac.il >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >> >> > -- [image: View my profile on LinkedIn] <http://www.linkedin.com/in/gliderflyer>
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