GPS Carrier-Phase Frequency Transfer on the NIMA Monitor Station Network

Abstract

The National Imagery and Mapping Agency (NIMA) maintains a worldwide GPS Monitor Station Network (MSN). We are in the process of studying carrier-phase frequency transfer as one method for understanding the overall network performance, and for potential use in testing future GPS receivers. We have developed processing software that uses 30-second dual frequency data in a continuous sequential estimator, which allows unlimited forward processing as well as optional backwards (fixed-interval) smoothing. States in the estimation include tropospheric and ionospheric delays, corrections (assumed small) to the station positions, and double-differenced carrier-phase biases. Satellite positions are taken from either precise or broadcast ephemerides. We have tested our process using both zero-baseline datasets and benchtop tests. Our initial results indicate that instabilities seen in the estimated time offsets are dominated by temperature variations coupling to the GPS receiver used.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2002
Accession Number
ADA484973

Entities

People

  • B. W. Tolman
  • D. Munton

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Algorithms
  • Artificial Satellites
  • Climate Change
  • Computational Complexity
  • Data Processing
  • Data Sets
  • Estimators
  • Frequency
  • Frequency Standards
  • Global Positioning Systems
  • Intervals
  • Measurement
  • Phase Measurement
  • Standards
  • Statistical Algorithms
  • Temperature Control
  • Time Intervals

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space