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Sensors 2018, 18(8), 2736; https://doi.org/10.3390/s18082736

Optimal Particle Filter Weight for Bayesian Direct Position Estimation in a GNSS Receiver

1
Institute of Geodesy, Graz University of Technology, Steyrergasse 30, 8010 Graz, Austria
2
Institute of Space Technology and Space Applications, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
*
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 13 August 2018 / Accepted: 14 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue GNSS and Fusion with Other Sensors)
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Abstract

Direct Position Estimation (DPE) is a rather new Global Navigation Satellite System (GNSS) technique to estimate the user position, velocity and time (PVT) directly from correlation values of the received GNSS signal with receiver internal replica signals. If combined with Bayesian nonlinear filters—like particle filters—the method allows for coping with multi-modal probability distributions and avoids the linearization step to convert correlation values into pseudoranges. The measurement update equation (particle weight update) is derived from a standard GNSS signal model, but we show that it cannot be used directly in a receiver implementation. The numerical evaluation of the formulas needs to be carried out in a logarithmic scale including various normalizations. Furthermore, the residual user range errors (coming from orbit, satellite clock, multipath or ionospheric errors) need to be included from the very beginning in the stochastic signal model. With these modifications, sensible probability functions can be derived from the GNSS multi-correlator values. The occurrence of multipath yields a natural widening of the probability density function. The approach is demonstrated with simulated and real-world Binary Phase Shift Keying signals with 1.023 MHz code rate (BPSK(1)) within the context of a real-time software based Bayesian DPE receiver. View Full-Text
Keywords: GNSS; Bayesian direct position estimation; BDPE; software receiver; particle filter; optimal particle weight GNSS; Bayesian direct position estimation; BDPE; software receiver; particle filter; optimal particle weight
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Dampf, J.; Frankl, K.; Pany, T. Optimal Particle Filter Weight for Bayesian Direct Position Estimation in a GNSS Receiver. Sensors 2018, 18, 2736.

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