GPS doesn't like to go back in time. You probably need to reset the almanac and a reboot is doing that.
On Tue, Apr 30, 2019, 9:53 AM Jason Matusiak via USRP-users < usrp-users@lists.ettus.com> wrote: > I've seen this a few times, but I cannot seem to lock it down to any > particular reason. While sitting at my desk with a GPS simulator (so I > have a known good signal), I will be doing testing and everything is fine > (it seems to be walking around the place where the unit was built). I will > turn off the GPS unit for the night and then the next day when I turn it > on, I never get a fix. I've seen this numerous times and the only way I > can fix it is to reboot the E310. It is like the GPS is getting into a > mucked up stated. Data comes streaming through, but it is just the last > good signal. > > I can't figure out a way to reset the GPS without rebooting it, does > anyone know of a way? I tried killing and restarting the daemon, but that > doesn't seem to do anything. I really think it is the GPS module, but > rebooting it everytime I want to run things "just in case." > > One other weird thing, when I run gpsmon in this screwed up state, it > mostly looks OK, but it has weird characters displayed throughout the ASCII > heading (for lack of a better term). > > This is a good setup on a different unit (so I don't expect to see a fix): > tcp://localhost:2947 u-blox> > ┌──────────────────────────┐┌─────────────────────────────────────────────────┐ > or":11} > │Ch PRN Az El S/N Flag U ││ECEF Pos: +6378137.00m +0.00m +0.00m > │ > er":"u-blox","subtype":"Unknown","activated":"2018-10-10T06:21:07.701Z","flags":1,"native":1,"bps":9600,"parity":"N","stopbits":1,"cycle":1.00,"mincycle":0.25}]} > │ 0 1 0 165 0 0110 ││ECEF Vel: +0.00m/s +0.00m/s > +0.00m/s │ false,"timing":false,"split24":false,"pps":true} > │ 1 2 0 165 0 0110 ││ > │ > │ 2 4 0 165 0 0110 ││LTP Pos: 0.000000000° 0.000000000° > -18.00m │ > │ 3 6 0 165 23 0310 ││LTP Vel: 0.00m/s 0.0° 0.00m/s > │ > │ 4 7 0 165 0 0110 ││ > │ > │ 5 9 0 165 23 0310 ││Time: 0 00:00:00.00 > │ > │ 6 14 0 165 22 0310 ││Time GPS: Day: > │ > │ 7 19 0 165 22 0310 ││ > │ > │ 8 20 0 165 21 0310 ││Est Pos Err9999998.72st Vel Err 0.00m/s > │ > │ 9 21 0 165 0 0110 ││PRNs: 0 PDOP:100.0 Fix 0x00 Flags 0x40 > │ > │10 22 0 165 0 0110 │└─────────────────── NAV_SOL > ─────────────────────┘ > │11 23 0 165 0 0110 > │┌─────────────────────────────────────────────────┐ > │12 24 0 165 0 0110 ││DOP [H] 100.0[V] 100.0[P] 100.0[T] 100.0[G] > 100.0│ > │13 28 0 165 23 0310 │└─────────────────── NAV_DOP > ─────────────────────┘ > │14 30 0 165 0 0110 > │┌─────────────────────────────────────────────────┐ > │15 136 0 165 0 0110 ││TOFF: > 1 day PPS: > │ > > There are lines around the different sections (they look like lines, not > dashes and bars). > > > and then on the unit that is hosed: > tcp://localhost:2947 u-blox> > lqqqqqqqqqqqqqqqqqqqqqqqqqqklqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk > or":11} > xCh PRN Az El S/N Flag U xxECEF Pos: -2414806.17m +5389584.51m > +2400650.28m x > er":"u-blox","subtype":"Unknown","activated":"2019-01-08T14:52:40.454Z","flags":1,"native":1,"bps":9600,"parity":"N","stopbits":1,"cycle":1.00,"mincycle":0.25}]} > x 0 2 0 165 50 0700 xxECEF Vel: +0.00m/s +0.00m/s > +0.00m/s x false,"timing":false,"split24":false,"pps":true} > x 1 4 0 165 50 0700 xx > x > x 2 5 0 165 50 0700 xxLTP Pos: 22.2557151134f 114.134790532f > 20.19m x > x 3 8 0 165 0 0100 xxLTP Vel: 0.00m/s 0.0f 0.00m/s > x > x 4 9 0 165 50 0700 xx > x > x 5 10 0 165 50 0700 xxTime: 61 06:13:40.00 > x > x 6 12 0 165 50 0700 xxTime GPS: 1877+529282.000 Day: 6 > x > x 7 13 0 165 50 0600 xx > x > x 8 17 0 165 50 0700 xxEst Pos Err2238690.24st Vel Err 0.00m/s > x > x 9 20 0 165 50 0700 xxPRNs: 0 PDOP:100.0 Fix 0x00 Flags 0xdc > x > x10 23 0 165 50 0700 xmqqqqqqqqqqqqqqqqqqq NAV_SOL > qqqqqqqqqqqqqqqqqqqqqj > x11 24 0 165 0 0110 > xlqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk > x12 27 0 165 50 0700 xxDOP [H] 100.0[V] 100.0[P] 100.0[T] 100.0[G] > 100.0x > x13 28 0 165 50 0700 xmqqqqqqqqqqqqqqqqqqq NAV_DOP > qqqqqqqqqqqqqqqqqqqqqj > x14 129 127 51 0 0110 > xlqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk > x15 xxTOFF: > 1 day PPS: > x > mqqqqqq NAV_SVINFO > qqqqqqqqjmqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj > > Not that instead of lines, I see characters. What is up with that???? > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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