Compensation of the Effects of Phase Wind-up for Improving the Performance of a GPS RTK-Based Vehicle Navigation System

Don Kim, Luis Serrano and Richard B. Langley

Abstract:	RTK technology is able to provide high accuracy and precision (that is, normally better than a few centimetres at a 95% confidence level) positioning and navigation solutions in real time. Unfortunately, many RTK systems suffer from reliability problems. These problems include a decrease in system availability with fewer satellites, susceptibility to biases and errors such as ionospheric refraction and tropospheric refraction, and the line-of sight dependent phase measurement effects (e.g., multipath, phase wind-up and antenna phase centre variation). As related with our recent work on an RTK-based vehicle navigation system, we have observed a few cases where the phase wind-up can significantly degrade the performance of the system. In this paper, we introduce three phase wind-up observables and perform qualitative assessment of the phase wind-up using the observables. The motivation behind this qualitative assessment is to answer the question: do we need to increase the complexity of an RTK-based vehicle navigation system by implementing algorithms to correct the effects of the phase wind-up?
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	346 - 354
Cite this article:	Kim, Don, Serrano, Luis, Langley, Richard B., "Compensation of the Effects of Phase Wind-up for Improving the Performance of a GPS RTK-Based Vehicle Navigation System," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 346-354.
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