A Kalman Filter Clock Algorithm for Use in the Presence of Flicker Frequency Modulation Noise

Abstract

NPL has developed a Kalman-filter-based clock algorithm for combining measurements from its three active hydrogen masers. The algorithm is designed to produce a near optimal composite when the dominant noise process present is flicker frequency modulation (FFM). The FFM is modelled approximately by a linear combination of Markov noise processes. Each Markov process is included in the Kalman filter and contributes an additional component to its state vector. Both the validity of the model and the effectiveness of adding these additional components to the state vector are examined. The performance of the new algorithm is examined when applied to simulated measurements and also to measurements obtained from NPL's hydrogen masers.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2004
Accession Number
ADA427980

Entities

People

  • C. A. Greenhall
  • John A. Davis
  • P. W. Stacey

Organizations

  • California Institute of Technology

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Atomic Beam Masers
  • Autocorrelation
  • Clocks
  • Composite Materials
  • Covariance
  • Data Sets
  • Filters
  • Frequency
  • Frequency Modulation
  • Jet Propulsion
  • Kalman Filters
  • Markov Processes
  • Mathematical Filters
  • Measurement
  • Modulation
  • Time Intervals

Readers

  • Acoustics.
  • Computational Modeling and Simulation
  • Positioning, Navigation, and Timing (PNT) Technology.