On Ultrahigh-Precision GPS Positioning and Navigation

Donghyun Kim and Richard B. Langley

Peer Reviewed

Abstract:	This paper introduces an ultrahigh-performance GPS positioning and navigation system for gantry crane auto-steering. The system differs from conventional systems in terms of the achievable positioning accuracy and precision. Aside from ambiguity resolution and reliability, many error sources (such as phase wrap-up, antenna phase-center variation, instrumental group delay bias, receiver clock jumps, and residual tropospheric delay.) must be handled precisely to attain ultrahigh-precision positioning solutions. The paper also introduces an optimal interfrequency carrier-phase linear combination of the L1 and L2 measurements that can reduce the effects of quasirandom errors (that is, errors including significant low-frequency components and showing to some extent random behavior over relatively short intervals of time), such as multipath, diffraction, and ionospheric scintillation. A practical approach to estimating realistic receiver system noise is also introduced.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 50, Number 2
Pages:	103 - 116
Cite this article:	Kim, Donghyun, Langley, Richard B., "On Ultrahigh-Precision GPS Positioning and Navigation", NAVIGATION: Journal of The Institute of Navigation, Vol. 50, No. 2, Summer 2003, pp. 103-116.
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