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Frequency Stability Measurement of Cryogenic Sapphire Oscillators With a Multichannel Tracking DDS and the Two-Sample Covariance
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
This article shows the first measurement of three 100 MHz signals exhibiting fluctuations from 2×10 −16 to parts in 10 −15 for integration time τ between 1 s and 1 day. Such stable signals are provided by three Cryogenic Sapphire Oscillators (CSOs) operating at about 10 GHz, also delivering the 100 MHz output via a dedicated synthesizer. The measurement is made possible by a 6-channel Tracking DDS (TDDS) and the twosample covariance tool, used to estimate the Allan variance. The use of two TDDSdoi:10.1109/tuffc.2018.2870593 fatcat:4l5wkgn4wnhe3cjnhuqhwd2s3q