By Topic

A software-based receiver sampling frequency calibration technique and its application in GPS signal quality monitoring

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Yanhong Kou ; Beihang Univ., Beijing, China ; Xingyun Zhou ; Morton, Yu. ; Akos, D.M.

This paper has investigated the sampling frequency error impact on the signal processing in a software-correlator based GPS receiver as well as the periodic averaging technique in a pre-correlation GPS signal quality monitor. The refined signal model of receiver processing in the presence of clock error is established as the foundation of the performance analyses. A software-based method is developed to accurately calibrate both the digital IF and the sampling frequency simultaneously. The method requires no additional hardware other than the GPS receiver RF front end output samples. It enables inline calibration of the receiver measurements instead of complicated post-processing. The performance of the technique is evaluated using simulated signals as well as live GPS signals collected by several GPS data acquisition equipments, including clear time domain waveforms/eye patterns, amplitude probability density histograms, Power Spectrum Density (PSD) envelopes, and correlation-related characteristics. The results show that we can calibrate the sampling frequency with an accuracy resolution of 10−9 of the true sampling frequency online, and the pre-correlation SNR can be potentially improved by 39dB using periodic averaging.

Published in:

Position Location and Navigation Symposium (PLANS), 2010 IEEE/ION

Date of Conference:

4-6 May 2010