Transcontinental and intercontinental portable clock time comparison
Abstract
A small portable rubidium clock has been developed for the comparisons of time scales. Tests during a oneyear period indicate that timegenerating clocks have stabilities of parts in 10 to the 14th power. The corresponding capability of the LoranC links is about 1 x 10 to the 13th power. Using a leastsquares quadratic fit, the measurements of the U.S. Naval Observatory and the International Time Bureau are evaluated as a time series. These readings show a standard deviation of approximately 100 ns and yearly timescale drifts of approximately 1 x 10 to the 13th power.
 Publication:

NASA STI/Recon Technical Report A
 Pub Date:
 March 1978
 Bibcode:
 1978STIA...7831993H
 Keywords:

 Atomic Clocks;
 Frequency Measurement;
 Loran C;
 Portable Equipment;
 Rubidium;
 Transoceanic Systems;
 Curve Fitting;
 Error Analysis;
 Frequency Stability;
 Instrument Errors;
 Least Squares Method;
 Standard Deviation;
 Instrumentation and Photography