Robust GNSS Phase Tracking in Case of Slow Dynamics using Variational Bayes Inference

Fabio Fabozzi, Stéphanie Bidon, Sebastien Roche and Benoît Priot

Peer Reviewed

Abstract:	For a precise GNSS (Global Navigation Satellite System) positioning, carrier phase measurements are required. However, cycle slipping in classical phase locked loop (PLL) can lead to a local or permanent loss of lock. To address this problem, we propose a robust nonlinear filter for carrier phase tracking based on Variational Bayes (VB) inference. So far, the algorithm is designed only for slow phase dynamics (i.e., first order loop). Interestingly, the estimator update equation can be expressed in closed form. Performance of our algorithm is assessed on synthetic and experimental GNSS data and compared to that of conventional PLL-based techniques. Results show that the proposed method brings significant improvement in terms of cycle slipping.
Published in:	2020 IEEE/ION Position, Location and Navigation Symposium (PLANS) April 20 - 23, 2020 Hilton Portland Downtown Portland, Oregon
Pages:	1189 - 1195
Cite this article:	Fabozzi, Fabio, Bidon, Stéphanie, Roche, Sebastien, Priot, Benoît, "Robust GNSS Phase Tracking in Case of Slow Dynamics using Variational Bayes Inference," 2020 IEEE/ION Position, Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020, pp. 1189-1195.
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