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

Jim Lux jimlux at earthlink.net
Fri Dec 16 05:37:29 UTC 2011


Say you want a quik n easy n cheap GPS simulator to test a GPS timing 
receiver.  How good does the oscillator (presumably some nice multiple 
of the chip rate) have to be?

My gut feel is that it needs to be, say, 10x better than the oscillator 
in the receiver, and you'd compare the timing output of the receiver 
against a similar timing signal derived right from the simulator's 
oscillator (e.g. if the timing receiver puts out 1pps, you have your 
oscillator divided down to 1pps, and you'd compare the two 1ppses)




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