[time-nuts] GPS noise reduction
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sun Apr 6 04:02:29 UTC 2008
Bruce Griffiths wrote:
> Bruce Griffiths wrote:
>
>>> Bruce,
>>> Thanks for verifying that a common OCXO for the TIC clocks will work.
>>> I wasn't looking forward to downgrading to individual XOs.
>>>
> Richard
>
> That only works if either:
>
> 1) The TIC OCXO isnt locked to the GPS (or either of the oscillators
> being disciplined).
>
> OR if the TIC OCXO is locked to the GPS:
>
> 2) The random GPS receiver PPS timing jitter (after sawtooth correction)
> is greater than the TIC resolution (10ns).
>
> Bruce
>
Failing either of the above conditions requires that random phase noise
modulation be added to the 100MHz OCXO output to ensure that the TIC
measurements average correctly.
Bruce
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