[time-nuts] ARRL FMT results

Hal Murray hmurray at megapathdsl.net
Thu Jan 4 17:19:13 EST 2007


> But there's a finite amount of time between when the signal is
> transmitted and when it is received.  During this time, the earth
> rotates, thus bringing the receiver either closer to or farther away
> from the transmitter.  Doesn't that cause a frequency shift?  Isn't
> this the Sagniac effect?  Small, but measurable as it is a
> relativistic effect, no? 

Is that a frequency shift or a phase shift?

The transmitter is moving at the same speed as the receiver.  That motion 
changes the transit time between the pair, but if the velocity is constant, 
that makes a time/phase offset rather than a frequency offset.  Do get a 
frequency offset you want a Doppler where one end is moving relative to the 
other.
 


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