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 <shali...@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 <jg...@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 > >_______________________________________________ > >time-nuts mailing list -- time-nuts@febo.com > >To unsubscribe, go to > >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >and follow the instructions there. > > -- > Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do > other things. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.