In message <[EMAIL PROTECTED]>, "Ulrich Bangert" writes: >Bj=F6rn,
>Motorola specified the VP Oncore with: > >130 ns observed (1s) with SA on >In position hold mode, < 50 ns observed (1s) with SA on = > >Ok, there IS a certain improvement with position hold. The important thing about position hold mode is not that you get better 1PPS but that the receiver knows how good the 1PPS is. In navigation mode, a satellite mistake will affect your 1PPS. It will still be within 130nsec of the 4D equation solution, but the 4D equation solution is wrong because one of the inputs is wrong. I pos-hold mode, the receive can and will spot the wrong input, throw it out and do the math again and because it's doing Nsat equations with one unknown instead of Nsat equations with four unknowns, it will get a much better fix on that one variable. But the important thing is that it know the solution makes sense. -- 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
