Peak Deviation from Prediction in Atomic Clocks

Results from a preliminary study of two GPS clocks tested on the ground show that the distribution of peak deviations from prediction cannot be assumed to be Gaussian. The standards are identical to models on board GPS block IIR satellites. The data were taken at the Naval Research Laboratory in the U.S. during life tests. We propose here two statistics that could be used to characterize peak deviation from prediction, preliminarily named PDIS and PTIE.