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Generalised Theory on the Effects of Sampling Frequency on GNSS Code Tracking

Published online by Cambridge University Press:  28 November 2017

Vinh T. Tran ,
Nagaraj C. Shivaramaiah ,
Thuan D. Nguyen ,
Joon W. Cheong ,
Eamonn P. Glennon  and
Andrew G. Dempster
Vinh T. Tran*
Affiliation:
(Australian Centre for Space Engineering Research, UNSW, Australia)
Nagaraj C. Shivaramaiah
Affiliation:
(University of Colorado at Boulder, USA)
Thuan D. Nguyen
Affiliation:
(NAVIS centre, Hanoi University of Science and Technology, Viet Nam)
Joon W. Cheong
Affiliation:
(Australian Centre for Space Engineering Research, UNSW, Australia)
Eamonn P. Glennon
Affiliation:
(Australian Centre for Space Engineering Research, UNSW, Australia)
Andrew G. Dempster
Affiliation:
(Australian Centre for Space Engineering Research, UNSW, Australia)
*
(E-mail: vinh.tran@student.unsw.edu.au)
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Abstract

Synchronisation of the received Pseudorandom (PRN) code and its locally generated replica is fundamental when estimating user position in Global Navigation Satellite System (GNSS) receivers. It has been observed through experiments that user position accuracy decreases if sampling frequency is an integer multiple of the nominal code rate. This paper provides an accuracy analysis based on the number of samples and the residual code phase of each code chip. The outcomes reveal that the distribution of residual code phases in the code phase range [0, 1/ns), where ns is the number of samples per code chip, is the root cause of accuracy degradation, rather than the ratio between sampling frequency and nominal code rate. Doppler frequencies, coherent integration periods, front-end filter bandwidths and received Carrier to Noise ratios (C/N0) also influence receiver accuracy. Also provided are a sampling frequency selection guideline and new proposed estimates of the correlation output and the Delay Locked Loop (DLL) tracking error, which can be applied to precisely model GNSS receiver baseband signal processing.

Keywords

Sampling frequencyDLL tracking errorResidual code phase
Type
Research Article
Information
The Journal of Navigation , Volume 71 , Issue 2 , March 2018 , pp. 257 - 280
Copyright
Copyright © The Royal Institute of Navigation 2017 

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