Improved Integer Ambiguity Resolution by Combining LAMBDA and LMS

A. Chen, A. Ramanandan, J.A. Farrell

Abstract:	Real-time high accuracy positioning in a GPS-INS system is achievable using GPS differential carrier phase measurements, assuming rapid and accurate on-the-fly integer ambiguity resolution. Currently, two leading methods for integer ambiguity resolution are LMS and LAMBDA. LMS features in low computational complexity, but may result in incorrect integer estimates. LAMBDA addresses the decorrelation of the integer vector and guarantees optimal integer estimates under certain assumptions while its computational complexity increases with the dimension of the integer vector. In this paper, we propose a new method for integer abmiguity resolution which combines the advatanges of LMS and LAMBDA. Test results show that proposed method gives better performance than LMS and has less computational computational complexity than LAMBDA.
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:	963 - 969
Cite this article:	Chen, A., Ramanandan, A., Farrell, J.A., "Improved Integer Ambiguity Resolution by Combining LAMBDA and LMS," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 963-969.
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