Hi Ulrich: It's interesting that the now in development carrier phase GPS time transfer method that might offer 1,000 times lower uncertanity is based on the Ashtech Z12 surveying receiver, not a timing specific GPS receiver. http://scholar.google.com/scholar?q=Ashtech%20Z12%20carrier%20phase%20GPS%20time%20transfer&hl=en&lr=&oi=scholart
Have Fun, Brooke Clarke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Ulrich Bangert wrote: >Poul-Henning did already give the answer. However i am not very happy >with the formulation > > > >>In other words, it has nothing to do with the receiver, it's >>about what you ask it to do. >> >> > >because > >a) I never saw a navigation receiver featuring a "position hold" mode > >b) I never saw a timing receiver featuring a "navigate forever" mode. >Everything that i had in my hands had a "automatic site survey" mode >after which it would return to "position hold". That's why i think the >formulation that it depends on the receiver's primary purpose is not >that wrong! > >Regards >Ulrich Bangert > > > >>-----Ursprüngliche Nachricht----- >>Von: [EMAIL PROTECTED] >>[mailto:[EMAIL PROTECTED] Im Auftrag von Poul-Henning Kamp >>Gesendet: Dienstag, 1. August 2006 12:28 >>An: [EMAIL PROTECTED]; Discussion of precise time and >>frequency measurement >>Betreff: Re: [time-nuts] Turning off PPS when not enough satellites >> >> >>In message >><[EMAIL PROTECTED]>, >>[EMAIL PROTECTED] writes: >> >> >>>On Tue, August 1, 2006 10:56, Ulrich Bangert said: >>> >>> >>> >>>>Note that any gps receiver can not be really good for >>>>timing and navigation at the same time, so all navigation >>>> >>>> >>receivers >> >> >>>>make bad timing receivers. >>>> >>>> >>>I am interested in your arguments for the above statement. Please >>>elaborate! >>> >>> >>The above statement should probably be read as: >> >>"If you solve for both position and time you get worse time >>than if you hold the position constant and solve only for time" >> >>In other words, it has nothing to do with the receiver, it's >>about what you ask it to do. >> >>Not all receivers can do "position hold" mode of course. >> >>-- >>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 time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts