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

Jim Lux jimlux at earthlink.net
Sun Dec 18 00:25:21 UTC 2011


On 12/17/11 2:56 PM, Magnus Danielson wrote:
> 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.
>


that is precisely what I was thinking.. I was just wondering if anyone 
had run across a reason why it wouldn't be the case.  (short of actually 
doing the no doubt tedious analysis)



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