A Comparison between the Three-Cornered Hat Method and the Standard Reference Source Method in Measuring Short-Term Frequency Stability (Allan deviation) of Frequency Sources
Journal of Environmental Science Computer Science and Engineering & Technology · 2023
Allan deviation is a statistical parameter normally used to measure the frequency stability of a signal source in time domain.The paper describes two important methods namely, the three-corner hat method and the standard reference source method for measuring the Allan deviations of signal sources.The short-term frequency stability (Allan deviations) of three numbers of highly stable 10 MHz ground Rubidium sources were measured by both the three-cornered hat method and the standard reference source method (where, a highly stable 10 MHz Passive Hydrogen Maser is used as reference source).The results obtained from both these methods are then compared and verified.A close match between the two indicates that both the methods are equally accurate and hence both can be used for measuring the short-term frequency stability of frequency sources.