[time-nuts] GPS for ntp

Didier Juges shalimr9 at gmail.com
Tue Oct 21 07:22:31 EDT 2014

Check lightningmaps.org, mentioned on this list before for lightning location via TOA using STMicro Cortex -M4 devices.

Didier KO4BB

On October 20, 2014 8:39:16 PM CDT, Joseph Gray <jgray at zianet.com> wrote:
>What does everyone think of this GPS module for ntp use? According to
>specsheet, it uses a Ublox Neo-7N.
>I'm thinking about using it for a Beaglebone ntp server. I know there
>some discussion about Beaglebones a while back. Has anyone gotten ntpd
>PPS and time stamping running on a Beaglebone yet (like on the Soekris
>Does anyone want to take a wild guess as to the best/worst case UTC
>I might get with such a setup? I realize that I'd have to try it to
>find out, but guesses and advice from those more knowledgeable is
>What I'm really after is to eventually have several Beaglebones
>around the area as part of a TDOA DF network. I have spare radios to
>dedicate to the task. Each fixed node will timestamp incoming
>and then relay that information to a central location. The central
>will use the data to calculate the location of the transmitter.
>Does anyone here have any experience with this sort of thing? Would you
>recommend a better way of accurately timing the transmissions vs using
>on each Beaglebone?
>I know that TDOA is used by the cellular companies. Is anyone aware of
>"user level" projects or source code for this? I've Googled a bit, but
>haven't turned up much. There was one thesis about an Amateur doing
>part of
>this, but he didn't have much detail on the satellite nodes and didn't
>describe anything about the centralized processing part.
>I have one Beaglebone White that I got cheap, so I have something to
>started with. Later, as I figure out things, I'll buy a few Beaglebone
>Joe Gray
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