Estimating Satellite Excessive Acceleration in the Presence of Phase Scintillations

Morten Stakkeland, Yngvild L. Andalsvik and Knut S. Jacobsen

Abstract:	A new integrity monitor for the excessive acceleration threat is described, and its performance with respect to probability of missed detection for a given false alarm rate is derived. The monitor is based on carrier phase measurements. Data collected from a prototype GAST D installation at Frankfurt airport were used to verify that the monitor meets the requirements with respect to false alarms at real operating conditions. Cycle slips caused by overflights were shown to create heavy tails in the distribution of the metric, which can be mitigated by better siting of the reference antennas and improved cycle slip detection. A recently described class of carrier phase anomalies also creates non Gaussian tails in the noise of the metric, but these effects can be mitigated by increasing the threshold and noise parameter. A framework is proposed for quantifying the monitor performance in the presence of phase scintillations, which is a third disturbance that can create heavy tails in the distribution. Phase scintillations are most commonly observed at high latitudes, but can move south during an ionospheric storm. Data collected at 71 degrees latitude during an ionspheric storm in 2011 is used together with a derived risk model based on the Rate of TEC Index (ROTI) to quantify the false alarm rate of the monitor at different latitudes.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	3532 - 3541
Cite this article:	Stakkeland, Morten, Andalsvik, Yngvild L., Jacobsen, Knut S., "Estimating Satellite Excessive Acceleration in the Presence of Phase Scintillations," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3532-3541.
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