HI all, For multiple E312 synchronizing,we did synchronous reception tests, and specific things as email descriptions: https://mail.google.com/mail/u/0/?pc=topnav-about-en#all/15f24798ac0bac0b I also noted that said it was a bug: http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889 Has this bug been repaired? can E312 be used for TDOA measurement and, if possible, how to implement it in the program? best regards Jon

Dear Jon, that first link points to your own GMail account. We can't do anything with that, I'm afraid. Please find the email you're referring to, cite it directly, or link to it on http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/ Thank you! Marcus M On 20.10.2017 03:20, liu Jong via USRP-users wrote: > HI all, > For multiple E312 synchronizing,we did synchronous reception tests, > and specific things as email descriptions: > https://mail.google.com/mail/u/0/?pc=topnav-about-en#all/15f24798ac0bac0b > I also noted that said it was a bug: > http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889 > <http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889> > > Has this bug been repaired? can E312 be used for TDOA measurement > and, if possible, how to implement it in the program? > > best regards > Jon > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Hi Marcus, I am sorry,the first link as below: http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2017-October/026761.html 2017-10-21 21:17 GMT+08:00 Marcus Müller via USRP-users < usrp-users@lists.ettus.com>: > Dear Jon, > > that first link points to your own GMail account. We can't do anything > with that, I'm afraid. > > Please find the email you're referring to, cite it directly, or link to it > on http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/ > > Thank you! > Marcus M > > On 20.10.2017 03:20, liu Jong via USRP-users wrote: > > HI all, > For multiple E312 synchronizing,we did synchronous reception tests, and > specific things as email descriptions: > https://mail.google.com/mail/u/0/?pc=topnav-about-en#all/15f24798ac0bac0b > I also noted that said it was a bug: > http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889 > > Has this bug been repaired? can E312 be used for TDOA measurement and, > if possible, how to implement it in the program? > > best regards > Jon > > > _______________________________________________ > USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >

Jon, Like I mentioned earlier, I've used E310's for TDOA measurements with success. I do have the same initial offset issue, but I can either a) compute the offset and manually correct for it, or b) stop and restart the stream, and the offset disappears. If the offset is drifting, you are not using a GPS disciplined clock. Are you sure you have GPS lock? -Daniel On Sun, Oct 22, 2017 at 7:44 PM, liu Jong via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi Marcus, > I am sorry,the first link as below: > http://lists.ettus.com/pipermail/usrp-users_lists. > ettus.com/2017-October/026761.html > > 2017-10-21 21:17 GMT+08:00 Marcus Müller via USRP-users < > usrp-users@lists.ettus.com>: > >> Dear Jon, >> >> that first link points to your own GMail account. We can't do anything >> with that, I'm afraid. >> >> Please find the email you're referring to, cite it directly, or link to >> it on http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/ >> >> Thank you! >> Marcus M >> >> On 20.10.2017 03:20, liu Jong via USRP-users wrote: >> >> HI all, >> For multiple E312 synchronizing,we did synchronous reception tests, and >> specific things as email descriptions: >> https://mail.google.com/mail/u/0/?pc=topnav-about-en#all/15f24798ac0bac0b >> I also noted that said it was a bug: >> http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889 >> >> Has this bug been repaired? can E312 be used for TDOA measurement and, >> if possible, how to implement it in the program? >> >> best regards >> Jon >> >> >> _______________________________________________ >> USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >

Hi Daniel, thank you for your reply. This is test code: I'm using tow E312 to estimate the arrive time difference between received signals.The program is explained as follows: uhd::usrp::multi_usrp::sptr UsrpDev = uhd::usrp::multi_usrp::make(“”); UsrpDev->set_time_source("gpsdo"); UsrpDev->set_clock_source("internal", uhd::usrp::multi_usrp::ALL_MBOARDS); ... uhd::stream_args_t StreamArgs; StreamArgs.cpu_format ="fc32"; StreamArgs.channels.clear(); StreamArgs.channels.push_back(0); uhd::rx_streamer::sptr RxStreamDev = UsrpDev->get_rx_stream(StreamArgs); ... UsrpDev->set_rx_gain(curGain); UsrpDev->set_rx_rate(curRxRates); UsrpDev->set_rx_freq(tune_request, 0); ... UsrpDev->set_time_next_pps(uhd::time_spec_t(GpsTime + 1.0)); ... uhd::stream_cmd_t CapCmdContStart( uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS ); CapCmdContStart.stream_now = false; CapCmdContStart.num_samps = IQ_NUMS; CapCmdContStart.time_spec = uhd::time_spec_t((double)nextBoardTime); RxStreamDev->issue_stream_cmd(CapCmdContStart); ... size_t RxNums = RxStreamDev->recv( RecvBuffVec, RecvNums, RxMetaData, timeoutD, false ); ... Right now, the data blocks received from the two receivers have strictly aligned time stamps: MatchTimeD=(E312-A)1508010715.000047200 (E312-B)1508010715.000047200 MatchTimeD=(E312-A)1508010715.010287300 (E312-B)1508010715.010287300 MatchTimeD=(E312-A)1508010715.020527100 (E312-B)1508010715.020527100 MatchTimeD=(E312-A)1508010715.030767400 (E312-B)1508010715.030767400 So,i think GPS locked for two E312. best regards Jon 2017-10-23 23:52 GMT+08:00 Daniel May <danielmay83@gmail.com>: > Jon, > > Like I mentioned earlier, I've used E310's for TDOA measurements with > success. I do have the same initial offset issue, but I can either a) > compute the offset and manually correct for it, or b) stop and restart the > stream, and the offset disappears. > > If the offset is drifting, you are not using a GPS disciplined clock. Are > you sure you have GPS lock? > > -Daniel > > On Sun, Oct 22, 2017 at 7:44 PM, liu Jong via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi Marcus, >> I am sorry,the first link as below: >> http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/ >> 2017-October/026761.html >> >> 2017-10-21 21:17 GMT+08:00 Marcus Müller via USRP-users < >> usrp-users@lists.ettus.com>: >> >>> Dear Jon, >>> >>> that first link points to your own GMail account. We can't do anything >>> with that, I'm afraid. >>> >>> Please find the email you're referring to, cite it directly, or link to >>> it on http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/ >>> >>> Thank you! >>> Marcus M >>> >>> On 20.10.2017 03:20, liu Jong via USRP-users wrote: >>> >>> HI all, >>> For multiple E312 synchronizing,we did synchronous reception tests, and >>> specific things as email descriptions: >>> https://mail.google.com/mail/u/0/?pc=topnav-about-en#all/15f >>> 24798ac0bac0b >>> I also noted that said it was a bug: >>> http://permalink.gmane.org/gmane.comp.hardware.usrp.e100/16889 >>> >>> Has this bug been repaired? can E312 be used for TDOA measurement and, >>> if possible, how to implement it in the program? >>> >>> best regards >>> Jon >>> >>> >>> _______________________________________________ >>> USRP-users mailing listUSRP-users@lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >