Studies of the Unbiased Fir Filter for the Time Error Model in Applications to GPS-Based Timekeeping

Abstract

The unbiased FIR filter is investigated to estimate the time interval error (TIE) K-D polynomial model of a local clock in GPS-based timekeeping in the presence of uniformly distributed sawtooth noise. An estimation algorithm is proposed and applied to the GPS-based TIE measurements of a crystal clock without using the sawtooth correction. Based upon this, we show that the TIE estimates fit actual values with an uncertainty of the GPS time. It is also demonstrated that estimates of the fractional frequency offset fit the measurements with the frequency shifts present in the reference rubidium source and the 1 PPS signal of a GPS receiver used.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA485677

Entities

People

  • O. Ibarra-manzano
  • Yu Shmaliy

Organizations

  • Universidad de Guanajuato

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Algorithms
  • Clocks
  • Closed Loop Systems
  • Coefficients
  • Data Science
  • Errors
  • Estimators
  • Filters
  • Filtration
  • Frequency
  • Frequency Shift
  • Gaussian Noise
  • Kalman Filters
  • Local Oscillators
  • Measurement
  • Statistical Algorithms
  • Time Intervals

Readers

  • Approximation Theory.
  • Computer Vision.
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space