A Comparison of GPS Broadcast and DMA Precise Ephemerides,

Abstract

We compare the broadcast ephemerides from Global Positioning Satellites (GPS) to the postprocessed ephemerides from the Defense Mapping Agency (DMA). We find significant energy in the spectrum of the residuals at 1 cycle/day and higher multiples. We estimate the time variance of the residuals and show that the short term residuals, from 15 min, exhibit power law processes with greater low frequency perturbations than white phase modulation. We discuss the significance of these results for the performance of the GPS Kalman filter which estimates the broadcast orbits.

Document Details

Document Type
Technical Report
Publication Date
Dec 02, 1993
Accession Number
ADP009114

Entities

People

  • Gerard Petit
  • Marc A. Weiss
  • Steve Shattil

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Artificial Satellites
  • California
  • Ephemerides
  • Filters
  • Frequency
  • Intervals
  • Kalman Filters
  • Mathematics
  • Modulation
  • Perturbations
  • Phase Modulation
  • Residuals
  • Spectra
  • Time Intervals

Readers

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

Technology Areas

  • Space
  • Space - Orbital Debris