BDS	BeiDou Navigation Satellite System
CIF	conventional ionosphere-free model
CIF2	conventional ionosphere-free model with dual-frequency
CIF2-BDS	conventional ionosphere-free model with dual-frequency BDS-only
CIF2-C	conventional ionosphere-free model with dual-frequency BDS+GPS combination
CIF2-GPS	conventional ionosphere-free model with dual-frequency GPS-only
CIF3	conventional ionosphere-free model with triple-frequency
CIF3-BDS	conventional ionosphere-free model with triple-frequency BDS-only
CIF3-C	conventional ionosphere-free model with triple-frequency BDS+GPS combination
CORS	Continuously Operating Reference Stations
CT	convergence time
DCB	differential code bias
DOY	day of year
ECIF2-C	extended CIF2-C model
FCB	fractional cycle bias
GMF	Global Mapping Function
GNSS	Global Navigation Satellite System
GPS	Global Positioning System
ICD	Interface Control Document
IFB	inter-frequency clock bias
ISB	inter-system clock bias
ISC	inter-signal correction
MGEX	Multi-GNSS Experiment
M-W	Melbourne-Wubbena detecting
PCO	Antenna Phase Center Offsets
PCV	Antenna Phase Center Variations
PPP	precise point positioning
TGD	timing group delay
UC	uncombined model
UC2	uncombined model with dual-frequency
UC3	uncombined model with triple-frequency
UC3-BDS	uncombined model based with triple-frequency BDS-only
UC3-C	uncombined model with triple-frequency BDS+GPS combination
UPD	uncalibrated phase delay