[time-nuts] how good an oscillator do you need for a GPS simulator

Magnus Danielson magnus at rubidium.dyndns.org
Sat Dec 17 17:56:21 EST 2011

On 12/17/2011 09:57 PM, Jim Lux wrote:
> L1 C/A
> But the real question isn't how to generate the signals (that's straight
> forward).. it's "how good does the oscillator have to be" to effectively
> test the receiver, in the sense of measuring it's timing performance.

A decent OCXO should be able to pull it off. Your receiver should 
long-term follow your OCXO. Take one of these 40 dollar rubidiums if you 
are worried.

Any drift of a good OCXO will be way within the bandwidth of the GPS 
channels. This drift would show up as added drift of the GPS oscillator, 
which is then being tracked and compensated.


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