A Hybrid Carrier Phase Measurement Weighting Scheme for Carrier Point Positioning Solution Improvement

F.A. Khan, M. Choudhury, A.G. Dempster, C. Rizos

Abstract:	Operation of GNSS receivers in noise- and interferencedominated environments results in degraded solution accuracy and precision. Locata, working on similar principles to the Global Positioning System (GPS) and using single point carrier phase positioning, can suffer from similar issues. This paper considers a variety of schemes to address these problems. It is established, using simulation results that, for single point positioning, the widely accepted Carrier-to-Noise and Interference Ratio (CNIR) based carrier phase measurement weighting scheme can degrade the solution quality rather than improve it. It is also established that the tracking loop’s bandwidth in addition to CNIR must be considered when generating correct weights for pseudorange measurements. Using a theoretical analysis of carrier phase measurements, a hybrid scheme is suggested for solution quality improvement. It is shown that the proposed scheme, suggesting the use of an adaptive bandwidth tracking loop architecture and total phase jitter based carrier phase measurement weighting, can offer excellent improvement in performance. Implementation results are presented which show that solution accuracy and precision improvements of up to 48% and 37% respectively can be achieved using the proposed scheme.
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:	892 - 900
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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