Frequency Calibration of A/D Converter in Software GPS Receivers

Abstract

This paper presents a software-based method to calibrate Analog-to-digital converter (ADC) sampling frequency in a software GPS receiver. Two front-end systems of a GPS software receiver were used in this study. The sampling frequencies of the ADC were found deviated from the nominal values provided by the manufacturers. Software algorithm was developed to calibrate the sampling frequencies. The algorithm is based on the initial-code-phase velocity and the carrier-phase velocity of the GPS signals at L1 frequency obtained by software receiver measurements. Allan variance analysis of this frequency characterization method is also included in this study.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2005
Accession Number
ADA484006

Entities

People

  • D. M. Lin
  • J. B. Tsui
  • J. Schamus
  • J. T. Morton
  • L. L. Liou

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Air Force
  • Air Force Research Laboratories
  • Algorithms
  • Analysis Of Variance
  • Calibration
  • Converters
  • Data Analysis
  • Digital Data
  • Frequency
  • Global Positioning Systems
  • Local Oscillators
  • Measurement
  • Military Research
  • Navigation
  • Phase Velocity
  • Sampling

Fields of Study

  • Computer science
  • Engineering

Readers

  • Integrated Circuit Design and Technology.
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Software Engineering.

Technology Areas

  • Space