Inter-system Bias: Stability and Impact on Multi-constellation Positioning

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.

GIOIA Ciro;  GAGLIONE Salvatore;  BORIO Daniele; 

2015-12-14

Institute of Electrical and Electronics Engineers (IEEE)

JRC95877

978-1-4799-7569-3,   

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7180635,    https://publications.jrc.ec.europa.eu/repository/handle/JRC95877,   

10.1109/MetroAeroSpace.2015.7180635,