[time-nuts] Alternative WWVB Spectracom solution
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Jun 15 05:06:16 EDT 2013
In message <25AAB11446C04D4897253FDD883547E1 at pc52>, "Tom Van Baak" writes:
>It would be a good project for a RPi (running an NTP client) or
>an Arduino (using a cheap GPS NMEA+1PPS receiver). If you can spot
>holes in the design let me know. It seems too simple to be true.
NTP shouldn't be needed: The computer could simply decode the new WWVB
signal and use the decoded bits to predict what the future bits will be.
If you use a technique similar to the "disprove" method I used for
DCF77 in NTPns, you will get very fast convergence, even if you don't
know all the individual bits yet.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
More information about the time-nuts
mailing list