[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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