Testing the Effects of M-Code on GPS Timing Receivers

Abstract

The Naval Research Laboratory has measured the effects of several modulation schemes proposed for use as the new Global Positioning System (GPS) M-Code on the operation of existing GPS timing receivers. Three candidate codes were tested at varying power levels to quantify the effects of the new signal added to a traditional GPS signal generated by a 10-channel GPS signal simulator. The M-Codes were generated in hardware to make representative Binary Offset Carrier and Manchester waveforms. Because the new codes may be run at considerably higher power levels than the current C/A and Y code signals, the M-Code signals were added in at power levels up to 40 dB over the existing signals. The test results show that the presence of M-Code signals is detectable. The effects on noise in the pseudorange and timing outputs are small.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1999
Accession Number
ADA494247

Entities

People

  • Douglas D. Koch
  • G. Landis
  • I. Galysh
  • J. Brad
  • J. White

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Ambient Noise
  • Artificial Satellites
  • Carrier Frequencies
  • Dynamic Range
  • Frequency
  • Generators
  • Global Positioning Systems
  • Military Research
  • Modulation
  • Navigation
  • Noise
  • Power Levels
  • Satellite Constellations
  • Simulators
  • Spectra
  • Time Intervals
  • Waveforms

Readers

  • Computer Programming and Software Development.
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Radar Systems Engineering.

Technology Areas

  • Space