In message <20101209105031.6104c800...@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes:
>Is there a similar sort of high level picture about sending timing info? I'm >not even sure what the units are. Basically with timing you only send one bit: "now" The most precise way to send that bit is to use a very long PRNG spreading code, and identify the correlator output peak using statistical estimation on the slopes up to the peak. DCF77 sends a 512 bit PRNG every second and in hand-run testes I have been able to determine the peak of the correlation with precision which is 100-500 times better than the second to second jitter on the 1200km propagation. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
