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

Magnus Danielson magnus at rubidium.dyndns.org
Sat Dec 17 17:01:31 UTC 2011


On 12/17/2011 05:10 PM, Jim Lux wrote:
> On 12/17/11 6:58 AM, Azelio Boriani wrote:
>> Correct: I was thinking how to simulate an only bird. The RACAL GPS101
>> is a
>> single channel simulator and maybe made that way. Then it is possible to
>> place a number of 1 channel simulators at a distance...
>>
>
>
> I was thinking more along the lines of how would one do a indoor test
> setup. Magnus's comment was a good one.. if you want to simulate
> multiple channels, you'd probably want some sort of resistive combiner.

Yes, but if you have them all in the same sample clock, adding them 
together you can do a smaller resistor chain DAC. Three or four bits can 
be done without much performance setback.

Jim, would you be satisfied with L1 C/A only or do you need L1/L2 P-code 
or even pseudo-P(Y)?

Cheers,
Magnus



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