SURGE ANOMALY IN CORSS-CORRELATED GPS MEASUREMENTS: DESCRIPTION AND ANALYSIS

J. M. Sleewaegen

Peer Reviewed

Abstract:	Careful observation of GPS data from receivers operating in a cross-correlation mode shows unexpected anomalies in the L2 measurements. During such an anomaly, the phase measurement exhibits a surge-like behavior with errors ranging from a few centimeters to tens of meters. At the same time, the code measurement is in error by a constant bias, and the signal-to-noise ratio SNR increases dramatically. This phenomenon lasts a couple of minutes and has a large adverse impact on the data quality: it is one of the major sources of cycle slips on L2, it is likely to be misinterpreted as an ionospheric event, and it confuses the traditional monitoring algorithms. This paper characterizes the phenomenon, explains its origin in the receiver architecture, examines its consequences, and presents a coping strategy.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 46, Number 2
Pages:	119 - 126
Cite this article:	Sleewaegen, J. M., "SURGE ANOMALY IN CORSS-CORRELATED GPS MEASUREMENTS: DESCRIPTION AND ANALYSIS", NAVIGATION: Journal of The Institute of Navigation, Vol. 46, No. 2, Summer 1999, pp. 119-126.
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