Analysis of Correlation Loss for MBOC Signals

Divyang Arora, Pravin Patidar

Peer Reviewed

Abstract: Global Positioning System (GPS) and Galileo share a common Power Spectral Density (PSD) spectrum frame called Multiplexed Binary Offset Carrier (MBOC) which was decided in a way such that both GPS L1 Civil (L1C) Signal and Galileo E1 Open Service (OS) signal would fit. A common PSD implies more interoperability requirement of these signals at user level. The work presented here not only analyses various implementation techniques of MBOC signals but most importantly the resulting correlation losses occurring due to their interactions in a GNSS tracking receiver. The analysis has been performed majorly using two candidate implementations: Time Multiplexed Binary Offset Carrier (TMBOC), used in U.S. GPS L1C signals and Composite Binary Offset Carrier (CBOC) signals, used in European Union’s Galileo E1 signals. The analysis assuming an unfiltered and distortion less channel, has been performed when a local reference signal is just a pilot or data component of TMBOC or CBOC and the incoming signal is an actual TMBOC or CBOC signal. The Cross-correlation among the various MBOC signal implementations results in an extra hidden loss apart from the known power loss. In this respect, a new method of analytical formulation to quantify the total correlation loss, actual correlation loss and power loss have been proposed and verified via simulation. The values of correlation losses obtained from the proposed analytical approach were found to be accurately similar to the ones obtained from simulation results, with maximum error margin of 0.03 dB. The proposed analytical formulation can thus be used to predict the cross-correlation losses of a typical GNSS receiver occurring out of mismatch in incoming GNSS signal and local reference signal. In an actual channel which is not void of distortions, this analysis and formulation can offer a significant insight to the receiver designer.
Published in: Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023)
September 11 - 15, 2023
Hyatt Regency Denver
Denver, Colorado
Pages: 3499 - 3512
Cite this article: Arora, Divyang, Patidar, Pravin, "Analysis of Correlation Loss for MBOC Signals," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 3499-3512.
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