and maybe that reflashing a 1uS nav receiver to have a 100nS timing receiver is related only to firmware improvements. Accurate timing is mandatory for accurate position/navigation. The CW12 timing receiver has a position hold mode that can't be turned off but always gives the computed position.
On Sun, Dec 30, 2012 at 12:50 PM, Magnus Danielson < [email protected]> wrote: > On 30/12/12 10:06, [email protected] wrote: > >> Hi Magnus, >> >> 2) Timing versions might get an upgraded oscillator. Maybe a TCXO >>>> instead >>>> of a standard XO. >>>> >>> >>> Don't think so. The noise and systematic stability is as important for >>> positional as for timing versions, the timing version can benefit of the >>> fixed position. >>> >> >> Look at the uBlox6 lineup. Position receivers are available with XO or >> TCXO - timing only with TCXO. >> >> http://www.u-blox.com/images/stories/linecards_u-blox_gps_modules_2012.pdf >> > > In that case they are the first to do it to my knowledge. > > None of the Motorola receivers did it as I recall it. Could be that the > price of the modules is now so low that the difference make sense. > > Notice that producing higher navigational rate is easy if you have the CPU > power to do it, and todays receivers have higher CPU power than they used > to, so doing 10 Hz navigation rate isn't unfeasable, so it does not need to > be Kalman filter predictor results. > > Cheers, > Magnus > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
