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.