Guys, Another little problem with the spec is that the 25m number is REALLY pessimistic. Typical 1 sigma performance is more in the 3-5m range for both the N and T variants of just about any earlier M12/M12+. Also, as Poul-Henning said, the Position Hold function really tightens up the 1PPS.
Randy Warner Senior Applications Engineer Synergy Systems, LLC [EMAIL PROTECTED] ________________________________________________________________________ ______________________________________________________________ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Poul-Henning Kamp Sent: Wednesday, January 03, 2007 5:13 AM To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Positional accuracy of the M12+T In message <[EMAIL PROTECTED]>, bg@ lysator.liu.se writes: >Hmmm... with 25m position accuracy (and 100ns is about 30m), how do >they really get time down to a few ns. Clever engineering! :-) Position hold mode allows them to solve N(sat) equations with one unknown instead of N(sat) equations with four unknowns. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | 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 [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
