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 one-year period indicate that time-generating clocks have stabilities of parts in 10 to the 14th power. The corresponding capability of the Loran-C links is about 1 x 10 to the -13th power. Using a least-squares 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 time-scale 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