[time-nuts] Compensating phase differnces in dual frequency GPS receviers?

Peter Monta pmonta at gmail.com
Fri Dec 2 04:33:45 EST 2011


> What if the crystal driving the DSP changes frequency with temperature?

I believe it would have no effect.  The local clock should drop out of
any navigation or timing solution, so long as the changes are slow
enough to avoid loss of lock in carrier tracking.

Let's take a GPS module with 1 PPS output.  Over temperature its
internal TCXO might be wandering around by parts in 10^7.  Does this
hurt the 1 PPS?  Nope, it soldiers on, the pulses remaining accurately
spaced by 1 second despite the variation in the local clock.

Cheers,
Peter




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