Now I have not gone through the math to estimate performance compared to the traditional ZCD approach, but the complex multiply and average approach should be quite robust against noise, and is easily implemented in a DSP or FPGA. Joe Gwinn

However, since the information capacity is never properly estimated the long term phase information quality can vary alot. The systematic noise sources added is also almost never properly analyzed. Ah well. Cheers, Magnus

AMU Arbitrary Manufacturer Units Antenna Measurement Units Arbitrary Mystery Units See if these help your estimate: http://gauss.gge.unb.ca/papers.pdf/SNR.memo.pdf ftp://goes.gsfc.nasa.gov/pub/chesters/goesref/Moreau_GPS.pdf http://www.wavedigm.com/pdf/UG_smartGPS.pdf /tvb _______________________________________________ time-nuts mailing list

With that as a starting point, it is easy to estimate the pulse polarity, height, and width. If you want to look at a detail, you have to look at the right place on the screen and wait for the next flash. It may take several tries and/or a bit of practice.

Are there any interesting estimates on when that will stop working? How does that compare to the lifetime of a watch or a software package? Tom recently said the decay is 2 ms/day per century. We are interested in 2 sec per year. That's 5.5 ms/year. So only 2 or 3 centuries.

The days of "independent" PN tracking loops for each signal are probably long gone, and there's clever "aiding" of the loops by estimating the on-the-fly variations.

Yes, and by connecting the speaker to the mic and issuing a pulse through the speaker you can estimate the latency of the OS. It should act like an echo chamber and the number of echoes per second is your inverse latency. The other trick is to use a TIC to compare the output pulse(s) against your house GPS/1PPS.

The 95% confidence error ellipse estimates ("rapid" orbits) were: GPS+GLONASS: lat 0.245m lon 0.219m alt 0.582m GPS ONLY: lat 0.269m lon 0.239m alt 0.616m GLONASS ONLY: lat 0.610m lon 0.755m alt 1.835m Conclusion... if you are just interested in an accurate antenna position, a $25 LEA-5T should do just fine.

-------- In message <6718818b-5243-8ad1-ddbd-6115fcdb6c29@earthlink.net>, jimlux writes: >On 12/4/18 9:00 AM, Tim Shoppa wrote: >> Because of the Q of WWVB's transmit antenna (at least 300 by my back of the >> envelope estimates), I don't think we could ever claim a WWVB PPS edge >> sharper than 5 milliseconds and that might be optimistic. > >Sure you can..

NRCAN process both L1 and L2: OBS G L1C L2C C1C C2C I get horizongal uncertainties of around a centimenter and vertical around 2cm: POS CRD SYST EPOCH A_PRIORI ESTIMATED DIFF SIGMA(95%) CORRELATIONS POS X IGS14 19:301:62520 3558657.3400 3558658.2826 0.9426 0.0130 1.0000 POS Y IGS14 19:301:62520