[time-nuts] GPS for ntp

Joseph Gray jgray at zianet.com
Tue Oct 21 09:23:24 EDT 2014


I missed the lightningmaps mention the first time. That is very helpful.

Joe Gray
W5JG


On Tue, Oct 21, 2014 at 5:22 AM, Didier Juges <shalimr9 at gmail.com> wrote:

> 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
> >the
> >specsheet, it uses a Ublox Neo-7N.
> >
> >
> http://www.ebay.com/itm/RY725AI-10Hz-UART-USB-interface-GPS-Glonass-QZSS-antenna-module-flash-memory-/181562403752
> >
> >I'm thinking about using it for a Beaglebone ntp server. I know there
> >was
> >some discussion about Beaglebones a while back. Has anyone gotten ntpd
> >with
> >PPS and time stamping running on a Beaglebone yet (like on the Soekris
> >Net4501)?
> >
> >Does anyone want to take a wild guess as to the best/worst case UTC
> >offset
> >I might get with such a setup? I realize that I'd have to try it to
> >really
> >find out, but guesses and advice from those more knowledgeable is
> >always
> >appreciated.
> >
> >What I'm really after is to eventually have several Beaglebones
> >scattered
> >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
> >transmissions
> >and then relay that information to a central location. The central
> >system
> >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
> >ntp
> >on each Beaglebone?
> >
> >I know that TDOA is used by the cellular companies. Is anyone aware of
> >some
> >"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
> >get
> >started with. Later, as I figure out things, I'll buy a few Beaglebone
> >Blacks.
> >
> >Joe Gray
> >W5JG
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> --
> Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do
> other things.
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