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Steigenberger, P., Hugentobler, U., Loyer, S., Perosanz, F., Prange, L., Dach, R., Uhlemann, M., Gendt, G. and Montenbruck, O. (2014) Galileo Orbit and Clock Quality of the IGS Multi-GNSS Experiment. Advances in Space Research, 55, 269-281.
http://dx.doi.org/10.1016/j.asr.2014.06.030

has been cited by the following article:

• TITLE: An Improved Model for Single-Frequency GPS/GALILEO Precise Point Positioning

  AUTHORS: Akram Afifi, Ahmed El-Rabbany

  KEYWORDS: PPP, GPS, Galileo, BSSD

  JOURNAL NAME: Positioning, Vol.6 No.2, May 28, 2015

  ABSTRACT: This paper introduces a new precise point positioning (PPP) model, which combines single-fre- quency GPS/Galileo observations in between-satellite single-difference (BSSD) mode. In the absence of multipath, all receiver-related errors and biases are cancelled out when forming BSSD for a specific constellation. This leaves the satellite originating errors and atmospheric delays un- modelled. Combining GPS and Galileo observables introduces additional biases that have to be modelled, including the GPS to Galileo time offset (GGTO) and the inter-system bias. This paper models all PPP errors rigorously to improve the single-frequency GPS/Galileo PPP solution. GPSPace PPP software of Natural Resources Canada (NRCan) is modified to enable a GPS/Galileo PPP solution and to handle the newly introduced biases. A total of 12 data sets representing the GPS/Galileo measurements of six IGS-MEGX stations are processed to verify the newly developed PPP model. Precise satellite orbit and clock corrections from IGS-MEGX networks are used for both GPS and Galileo measurements. It is shown that sub-decimeter level accuracy is possible with single-frequency GPS/Galileo PPP. In addition, the PPP solution convergence time is improved from approximately 100 minutes for the un-differenced single-frequency GPS/Galileo solution to approximately 65 minutes for the BSSD counterpart when a single reference satellite is used. Moreover, an improvement in the PPP solution convergence time of 35% and 15% is obtained when one and two reference satellites are used, respectively.