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Allan's TIME > Publications > Science of Timekeeping
 

The Science of Timekeeping

by David W. Allan, Neil Ashby, Clifford C. Hodge;
Hewlett Packard Application Note 1289;
1997

PDF file (88-pages; 1.13 MB)

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The Science of Timekeeping (cover image)
UTC: Official World Time
GPS: A Time Distribution Utility
Time: An Historical and Future Perspective
From Laboratory to Practical Use
Broad Applications Across Society

Table of Contents

Introduction to the Science of Timekeeping .......................................... 8

Precise Timing Applications Pervade Our Society ................................ 10

Clocks and Timekeeping............................................................................ 14

The Definition of the Second and its General Importance .................. 19

Historical Perspective ................................................................................ 19

An Illustrative Timekeeping Example ..................................................... 22

UTC, Official Time for the World ............................................................. 26

GPS Time and UTC ..................................................................................... 30

Accuracy and Stability of UTC .................................................................. 31

Einstein’s Relativity and Precise Timekeeping ...................................... 36

How to Access UTC .................................................................................... 39

Future Timing Techniques......................................................................... 44

Global Navigation Satellite System Developments ................................ 47

UTC and the Future .................................................................................... 52

Conclusions ................................................................................................. 53

Acknowledgments ...................................................................................... 54

Appendix A: Time and Frequency Measures Accuracy, Error,
Precision, Predictability, Stability, and Uncertainty ............................. 56

Appendix B: Stability Analysis of Harrison-like Chronometers ........... 66

Appendix C: Time and Frequency Transfer, Distribution
and Dissemination Systems ....................................................................... 72

Glossary and Definitions............................................................................ 82

Bibliography ................................................................................................ 85

 
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