Stochastic Modeling of GPS Receiver Clocks for Improved Positioning and Fault Detection Performance

F-C. Chan, B. Pervan

Abstract: A multiple-state stochastic clock model of a GPS receiver clock is derived using methods that have been successfully applied in existing models for high-quality satellite clocks. An advantage of having a stochastic receiver clock model is that it can lead to improved positioning performance in GPS navigation systems. Another benefit is that the additional redundancy provided by a clock dynamic model can increase fault detection performance and availability of receiver autonomous integrity monitoring (RAIM). It is shown that a four-state receiver clock model, which accounts for both the clock’s random and deterministic errors, can be easily incorporated into a Kalman filter for improved the real-time position and clock state estimation, without the need for a corresponding dynamic model for the position states. As a preliminary analysis, the results of the estimated receiver clock from the Kalman filter framework is then used to quantitatively evaluate the performance improvements in both positioning (fault-free availability) and fault detection (RAIM availability). In this work, current navigation systems under consideration by the GNSS Evolutionary Architecture Study (GEAS) are used as benchmark applications for performance evaluation using the receiver clock model augmentation.
Published in: Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009)
September 22 - 25, 2009
Savannah International Convention Center
Savannah, GA
Pages: 1652 - 1665
Cite this article: Chan, F-C., Pervan, B., "Stochastic Modeling of GPS Receiver Clocks for Improved Positioning and Fault Detection Performance," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 1652-1665.
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