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A Combined GPS/GLONASS Navigation Algorithm for use with Limited Satellite Visibility

Published online by Cambridge University Press:  07 October 2009

Changsheng Cai  and
Yang Gao
Changsheng Cai*
Affiliation:
(University of Calgary)
Yang Gao
Affiliation:
(University of Calgary)
*
(Email: ccai@ucalgary.ca)
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Abstract

Navigation users will significantly benefit from the combined use of GPS and GLONASS due to the improved reliability, availability and accuracy especially in an environment with limited satellite visibility, such as in urban or mountainous areas. But in such situations the visible satellite number is often still insufficient to obtain a position solution even if both GPS and GLONASS measurements are used. This is partly because at least five visible satellites are required to determine a position due to an offset between the timescales of GPS and GLONASS to be solved. In this paper, an algorithm has been proposed to obtain a position solution with only four visible GPS/GLONASS satellites. In addition to the data from IGS stations, an experiment was also conducted to assess the proposed algorithm. The results indicate that using the proposed algorithm with only four GPS/GLONASS satellites a position solution could be obtained at the cost of a slight accuracy loss.

Keywords

GPSGLONASSNavigation
Type
Research Article
Information
The Journal of Navigation , Volume 62 , Issue 4 , October 2009 , pp. 671 - 685
Copyright
Copyright © The Royal Institute of Navigation 2009

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