[time-nuts] Strange GPS behaviour

Magnus Danielson magnus at rubidium.dyndns.org
Sun Dec 30 11:50:27 UTC 2012

On 30/12/12 10:06, bg at lysator.liu.se 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.


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