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Multi-millisecond GNSS Maximum Likelihood Bit Synchronization Method

Authors:
Gerardo Ludovico Puga
Pedro Agustín Roncagliolo
Javier Gonzalo García

Keywords: GPS; GLONASS; receiver; data modulation

Abstract:
This paper introduces a new maximum likelihood bit synchronization algorithm that can be tailored to be used with different types of GNSS signals (GPS, GLONASS). A preliminary version of this work was presented in a previous paper by the same authors. In that paper, it was shown that this method allows to determine the positions of the bit edges in the signal using multiple millisecond correlation values. Using longer correlation times for bit synchronization decreases the peak processor load on embedded GNSS receivers that are based on carrier and code tracking loops for signal tracking, since for this kind of processing, longer correlation times allow for lower tracking loop update rates. In that previous paper it was also shown (through the use of simulations) that this new method presented lower error rates compared to the histogram method for fixed length observation intervals. The present paper extends these results in two ways. First, it generalizes the proposed method to N-millisecond integrations, providing a framework for automatic generation of the Viterbi state machine that drives the synchronization. Second, this paper provides a simple analytical expression that can be used to estimate the synchronization error rate of the algorithm, and identifies its most important design parameters.

Pages: 34 to 39

Copyright: Copyright (c) IARIA, 2013

Publication date: April 21, 2013

Published in: conference

ISSN: 2308-4480

ISBN: 978-1-61208-264-6

Location: Venice, Italy

Dates: from April 21, 2013 to April 26, 2013