Ambiguity Validation with Combined Ratio Test and EIA

W. Chen, S. Ji, J. Bing, X. Ding, Y. Chen, C. Zhao, C. Hu

Abstract:	To ensure reliable ambiguity resolution, ambiguity validation is an indispensable step. It has been a challenge for many years and is far from being resolved. Over the past years, various ambiguity validation methods have been proposed, such as F-ratio test, R-ratio test, difference test, projector test, Ellipsoidal Integer Aperture (EIA) estimator and Penalized Integer Aperture (PIA) estimator. In this paper, through analysis and test, we find that, when the aperture region of EIA is not allowed to be overlapped, the efficiency of ambiguity resolution with EIA is low and it is not applicable to fast static positioning or realtime kinematic (RTK) applications. Then EIA with overlapped aperture regions is recommended and the resulted fail-rate becomes upper bound of the actual one. After that, it is suggested that combined use of overlapped EIA and R-ratio test can increase the reliability of ambiguity resolution. Finally, numerical tests are carried out based on practical buoy data and simulated Galileo data.
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:	2741 - 2750
Cite this article:	Chen, W., Ji, S., Bing, J., Ding, X., Chen, Y., Zhao, C., Hu, C., "Ambiguity Validation with Combined Ratio Test and EIA," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2741-2750.
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