Hi Ron, On 07/05/2012 07:12 AM, Ron Ward wrote:
Hi: I am also new and would like information about ADEV, MDEV, HDEV, TDEV, Phase and Frequency Difference.
You can start of with the Allan Deviation article on Wikipedia. It has the focus on ADEV, from that the modified Allan Deviation is achieved by simply averaging the input. The Hadamard uses the third degree derivative of the phase data, when Allan only uses the second, and that helps overcome the linear drift sensitivity that Allan variance has, but providing essentially the same scale. The Hadamard is also available in the modified form to achieve the same distinction of frequency flicker and frequency white noise that MDEV does. TDEV is really a time stability measure rather than the frequency stability measure that the ADEV is, it is defined out of MDEV but in reality you can use ADEV measures for higher taus.
NIST TN1337 is still highly recommended reading, but it is drinking from the hose. NIST SP 1065 is also recommended.
If there is something on the Wikipedia article that can be improved, please let me know.
Oh, welcome Ron! :) Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
