CNES	Centre National d’Etudes Spatiales
DCB	Differential Code Bias
DF	Dual-Frequency
DOP	Dilution of Precision
ECEF	Earth-Centered Earth-Fixed
EKF	Extended Kalman Filter
GLONASS	Global Navigation Satellite System
GNSS	Global Navigation Satellite System
GPS	Global Positioning System
IGS	International GNSS Service
IMU	Inertial Measurement Unit
INS	Inertial Navigation System
ISB	Inter-System Bias
LC	Loosely-Coupled
LLF	Local-Level Frame
MEMS	Micro-Electro-Mechanical Systems
NHC	Non-Holonomic Constraints
PPP	Precise Point Positioning
RMS	Root Mean Square
RTS	Real-Time Service
SAE	Society of Automotive Engineers
SBAS	Satellite-Based Augmentation System
SF	Single-Frequency
SPP	Standard Point Positioning
UDR	Untethered Dead Reckoning
ZUPT	Zero-Velocity Update