MEMS Oscillators for Kinematic GNSS Receivers and Carrier-phase Positioning

Bernhard M. Aumayer and Mark G. Petovello

Peer Reviewed

Abstract:	When using a temperature-sensing MEMS oscillator (TSMO) as clock source for GNSS receivers, temperature compensation can be highly beneficial for both acquisition and tracking, especially in the presence of fast temperature changes or at extreme temperatures where the influence of temperature on the oscillator frequency is highest. We designed a series of temperature measurement pre-processing filters to analyze the receiver phase-lock tracking as a function of filter complexity. For real-time applications, an application specific filter bandwidth has to be chosen to balance between temperature estimation latency and introduced noise. We also analyzed non-causal filters which are only suitable for post-mission processing. Furthermore, we demonstrate results from the usage of a TSMO for a GNSS receiver in carrier phase positioning mode. Results on static live GPS data show the feasibility to reliably track the carrier phase without cycle slips. Zero-baseline and short-baseline differential static positioning show the position accuracy and noise of a receiver in comparison to a traditional crystal oscillator-based receiver. Shake tests on static antennas further quantify the influence of accelerations on the receiver. Finally, kinematic road tests in a vehicle performing differential carrier phase positioning on a short baseline allow to compare the oscillator’s general performance and acceleration sensitivity to those of traditional quartz technology oscillators.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	3671 - 3680
Cite this article:	Aumayer, Bernhard M., Petovello, Mark G., "MEMS Oscillators for Kinematic GNSS Receivers and Carrier-phase Positioning," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 3671-3680.
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