Timescale Algorithms Combining Cesium Clocks and Hydrogen Masers

Abstract

The USNO atomic timescale, formerly based on an ensemble of cesium clocks, is now produced by an ensemble of cesium clocks and hydrogen masers. In order to optimize stability and reliability, equal clock weighting has been replaced by a procedure reflective, time-varying noise characteristics of the two different types of clocks. Correction of frequency drift is required, and residual drift is avoided by the eventual complete deweighting of the masers.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1991
Accession Number
ADA494723

Entities

People

  • Lee A. Breakiron

Organizations

  • United States Naval Observatory

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Algorithms
  • Atomic Beam Masers
  • Clocks
  • Frequency
  • Frequency Standards
  • Frequency Synthesizers
  • Hydrogen
  • Masers
  • Measurement
  • Reliability
  • Sampling
  • Standards
  • Steering
  • Time Intervals
  • Time Signals

Readers

  • Positioning, Navigation, and Timing (PNT) Technology.
  • Systems Analysis and Design