[time-nuts] Code for phase noise and allan variance
John Ackermann N8UR
jra at febo.com
Mon Jun 27 19:11:05 EDT 2005
Hi Matt --
I have a perl script, based on some code from Tom Van Baak, that does
basic AVAR stuff. Poul-Henning Kemp has posted some C code to do the
same thing -- you might take a look at the list archive to find that
Matt Ettus wrote:
>Does anyone have code which will take an amplitude vs. time input
>stream and output phase noise and/or allan variance?
>P.S. I was forwarded a message from the list about the USRP. The
>USRP does have an input for an external clock source, so feel free to
>feed it from your Hydrogen Maser or whatever else you have laying
>The reference needs to be at 64 MHz or lower. You ADC sample rate can
>be 1/4*fref, 1/2*fref, fref, or 2*fref, as long as the final rate is
><= 64 MHz.
>The DAC sample rate will always be 2*fref.
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