The Design of Asynchronous Kalman Filter-based Tracking Loop in Digital Domain

Wenhui Lin, Xin Chen, Yuze Wang, and Di He

Abstract:	Modern GNSS receivers have been widely used in many occasions. In complex environment like urban street or dense forest, the signal of satellites will be attenuated significantly and may lead to a loss of lock of tracking loop. Usually, GNSS receivers track weak signals by increasing the coherent integration time. However, the increase of integration time also adds to the uncertainty of carrier phase and frequency, therefore the tracking loop must make a trade-off between sensitivity and dynamics. In this paper, an asynchronous Kalman tracking loop architecture is proposed, which improves the dynamic performance in a weak signal condition by applying multiple feedback on NCO frequency. The tracking results are obtained and compared by several simulation experiments. For parameters design and performance analysis of Kalman filter, the discrete-update model is applied for more accurate results, and methods including noise bandwidth analysis and P matrix analysis are presented respectively.
Published in:	Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017) September 25 - 29, 2017 Oregon Convention Center Portland, Oregon
Pages:	3853 - 3864
Cite this article:	Lin, Wenhui, Chen, Xin, Wang, Yuze, He, Di, "The Design of Asynchronous Kalman Filter-based Tracking Loop in Digital Domain," Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 3853-3864. https://doi.org/10.33012/2017.15238
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