Hi Now for a bit more of the storyt :)
If you take your 24 hours worth of data from the F9P and send it to NRCan for analysis, they come back with a plot and data file that shows the clock running about +/- 2 ns over the 24 hour period. The ADEV at one second is about 10X better than what Mark’s measured data on the 1 PPS shows. Obviously more research is called for :) It is also interesting to note that while the F9P may not hit the specs on the F9T in a way. that a TimeNut might like, it does hit them in a fashion that would back up all the marketing claims. One good piece of news: The “cheap” eBay antennas from China seem to do just as well as a “proper” survey antenna. The signal to noise numbers are essentially same / same. The error eclipse comes out in the same sort of mm-ish dimensions. Plenty good enough for timing. Bob > On Feb 11, 2019, at 5:28 PM, Mark Sims <[email protected]> wrote: > > I got in a Ublox F9P multi-band receiver from Sparkfun. Lately I've been > testing the 1PPS output. This data is from the F9P tracking GPS and GLONASS > L1 and L2. The PPS was measured by a TAPR TICC clocked by an HP-5071A. > BTW, processing the raw F9P measurement data with CSRS-PPP produces > lat/lon/alt location error ellipses in the 5/10/20mm range with my horrible > antenna location. Bob got 3/6/12 mm. > > The GREEN plot is the PPS output from the F9P. The ORANGE plot is that value > adjusted by the sawtooth correction. The BLUE line is the PPS ADEV plot. > It is interesting that the reported F9P sawtooth values don't average to > 0.000 nsec. > > # > # Device: Ublox F9P receiver > # > # Unit type: TAPR TICC > # Serial number: > # Firmware ver: > # Board ver: > # EEPROM ver: 0 > # Mode: Timestamp > # Ref clock: HP-5071A > # > # > # Unit type: Ublox F9 receiver > # SW: EXT CORE 1.00 (eba0dc > # HW: 00190000 > # ROM 1: ROM BASE 0x118B2060 > # ROM 2: FWVER=HPG 1.10 > # ROM 3: PROTVER=27.10 > # ROM 4: MOD=ZED-F9P > # ROM 5: GPS;GLO;GAL;BDS > # ROM 6: QZSS > # > # > # PPS ADEV for 84955 points - sample period=1.000 secs - bin count:14 > # 1.000 tau 3.4621e-009 (n=43197) > # 2.000 tau 1.7355e-009 (n=43195) > # 5.000 tau 6.8783e-010 (n=43189) > # 10.000 tau 3.4520e-010 (n=43179) > # 20.000 tau 1.7183e-010 (n=43159) > # 50.000 tau 7.0574e-011 (n=43099) > # 100.000 tau 3.6007e-011 (n=42999) > # 200.000 tau 1.8072e-011 (n=42799) > # 500.000 tau 7.2585e-012 (n=42199) > # 1000.000 tau 3.6834e-012 (n=41199) > # 2000.000 tau 1.8453e-012 (n=39199) > # 5000.000 tau 7.4818e-013 (n=33199) > # 10000.000 tau 3.5851e-013 (n=23199) > # 20000.000 tau 1.6814e-013 (n=3199) > # > # PPS HDEV for 84955 points - sample period=1.000 secs - bin count:13 > # 1.000 tau 3.6499e-009 (n=43196) > # 2.000 tau 1.8313e-009 (n=43193) > # 5.000 tau 7.2455e-010 (n=43184) > # 10.000 tau 3.6413e-010 (n=43169) > # 20.000 tau 1.8064e-010 (n=43139) > # 50.000 tau 7.4202e-011 (n=43049) > # 100.000 tau 3.7939e-011 (n=42899) > # 200.000 tau 1.9034e-011 (n=42599) > # 500.000 tau 7.6306e-012 (n=41699) > # 1000.000 tau 3.8724e-012 (n=40199) > # 2000.000 tau 1.9281e-012 (n=37199) > # 5000.000 tau 7.8140e-013 (n=28199) > # 10000.000 tau 3.5864e-013 (n=13199) > # > # PPS MDEV for 84955 points - sample period=1.000 secs - bin count:13 > # 1.000 tau 3.4621e-009 (n=43197) > # 2.000 tau 1.2295e-009 (n=43194) > # 5.000 tau 3.0416e-010 (n=43185) > # 10.000 tau 1.0540e-010 (n=43170) > # 20.000 tau 3.8724e-011 (n=43140) > # 50.000 tau 1.5815e-011 (n=43050) > # 100.000 tau 7.9180e-012 (n=42900) > # 200.000 tau 3.5732e-012 (n=42600) > # 500.000 tau 1.1746e-012 (n=41700) > # 1000.000 tau 5.9070e-013 (n=40200) > # 2000.000 tau 3.3584e-013 (n=37200) > # 5000.000 tau 1.4796e-013 (n=28200) > # 10000.000 tau 5.1583e-014 (n=13200) > # > # PPS TDEV for 84955 points - sample period=1.000 secs - bin count:13 > # 1.000 tau 1.9989e-009 (n=43197) > # 2.000 tau 1.4197e-009 (n=43194) > # 5.000 tau 8.7803e-010 (n=43185) > # 10.000 tau 6.0855e-010 (n=43170) > # 20.000 tau 4.4715e-010 (n=43140) > # 50.000 tau 4.5654e-010 (n=43050) > # 100.000 tau 4.5714e-010 (n=42900) > # 200.000 tau 4.1260e-010 (n=42600) > # 500.000 tau 3.3908e-010 (n=41700) > # 1000.000 tau 3.4104e-010 (n=40200) > # 2000.000 tau 3.8780e-010 (n=37200) > # 5000.000 tau 4.2712e-010 (n=28200) > # 10000.000 tau 2.9781e-010 (n=13200) > # > # > # PPS MTIE for 32768 points - sample period=1.000 secs - bin count:16 > # 1.000 tau 6.5166e+000 (n=32768) (nanoseconds max time interval > error) > # 2.000 tau 6.5166e+000 (n=32766) > # 4.000 tau 6.5166e+000 (n=32764) > # 8.000 tau 6.5166e+000 (n=32760) > # 16.000 tau 6.5166e+000 (n=32752) > # 32.000 tau 6.5166e+000 (n=32736) > # 64.000 tau 6.5166e+000 (n=32704) > # 128.000 tau 6.5166e+000 (n=32640) > # 256.000 tau 6.5166e+000 (n=32512) > # 512.000 tau 6.5166e+000 (n=32256) > # 1024.000 tau 6.5166e+000 (n=31744) > # 2048.000 tau 6.5166e+000 (n=30720) > # 4096.000 tau 6.5166e+000 (n=28672) > # 8192.000 tau 6.5166e+000 (n=24576) > # 16384.000 tau 6.5166e+000 (n=16384) > # 32768.000 tau 6.5166e+000 (n=1) > # > # > # > # Plot statistics: > # > # Sawtooth: > # rms: 2.257634439 ns > # avg: -0.109084539 ns > # sdv: 2.254997522 ns > # var: 5.085013825 ns > # min: -4.047000000 ns > # max: 3.808000000 ns > # span: 7.855000000 ns > # > # Tpps: (measured PPS deviation form 1.0000 seconds) > # rms: 3.255180518 ns > # avg: 0.000165522 ns > # sdv: 3.255180514 ns > # var: 10.596200180 ns > # min: -8.712959243 ns > # max: 8.774804883 ns > # span: 17.487764126 ns > # > # Tadj: (PPS measurement adjusted for sawtooth error) > # rms: 2.305958761 ns > # avg: -0.108871574 ns > # sdv: 2.303387242 ns > # var: 5.305592789 ns > # min: -5.626733815 ns > # max: 5.401032108 ns > # span: 11.027765923 ns > # > # Sats: (tracking GPS and GLONASS) > # rms: 14.592751290 > # avg: 14.485540834 > # sdv: 1.765643501 > # var: 3.117496974 > # min: 9.000000000 > # max: 19.000000000 > # span: 10.000000000 > # > <f9padev.gif>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
