Title: Inter-system Bias: Stability and Impact on Multi-constellation Positioning
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication Year: 2015
JRC N°: JRC95877
ISBN: 978-1-4799-7569-3
URI: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7180635
DOI: 10.1109/MetroAeroSpace.2015.7180635
Type: Articles in periodicals and books
Abstract: Global Navigation Satellite Systems (GNSSs) operate using independent time scales. For this reason, the determination of inter-system time offsets is required to enable multi-constellation solution. In this paper, two different approaches for the determination of the inter-system bias are considered and their performance is evaluated using measurements from three multi-constellation receivers. From the results obtained, it can be noted that the Galileo to GPS Time offset (GGTO) is more stable than the GPS/GLONASS inter-system bias which is characterized by a small drift. Different receivers provide different estimates of the inter-system bias, however the inter-system bias can be considered constant over a short time interval, hence an additional equation can be introduced in the estimation process. The use of pseudo-measurement on the inter-system bias significantly improves multi-constellation positioning performance.
JRC Directorate:Space, Security and Migration

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