COST Action ES 1206 Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate (GNSS4SWEC).
ESA Galileo presentation.
Trimble GPS tutorial the basics of GPS navigation.
European GNSS Agency
EUREF Permanent Network
First IGS reprocessing campaign (repro1)
Second IGS reprocessing campaign (repro2)
GOP real-time reprocessing campaign (GOPE-RT)