7. List of Typical GNSS Related Acronyms 
 
APME    A Posteriori Multipath Estimation 
ARP    Antenna Reference Point 
ASCII    American Standard Code for Information Interchange 
CMR    Compact Measurement Record 
CPU    Central Processing Unit 
CR    Carriage Return 
CTS    Clear to Send 
DGPS    Differential Global Positioning System 
DOP    Dilution of Precision 
EGNOS    European Geostationary Navigation Overlay System 
ESTB    EGNOS System Test Bed 
FPGA    Field Programmable Gate Array 
GLONASS  Global Orbiting Navigation Satellite System (Russian alternative for GPS) 
GNSS    Global Navigation Satellite System 
GPRS    General Packet Radio Service 
GPS    Global Position System 
GPX    GPS eXchange 
GSM    Global System for Mobile communications 
GUI    Graphical User Interface 
HERL    Horizontal External Reliability Level 
HPL    Horizontal Protection Level 
IGS    International GNSS Service 
LAMBDA  Least-squares Ambiguity Decorrelation Adjustment 
LED    Light Emitting Diode 
MDB    Minimal Detectable Bias 
MOPS    Minimum Operational Performance Standards 
MSAS    Multi-functional Satellite Augmentation System 
MT    Message Type 
NGS    National Geodetic Survey 
NMEA    National Marine Electronics Association 
OEM    Original Equipment Manufacturer 
OTF    On the Fly 
PPS    Pulse Per Second 
PVT    Position Velocity Time 
RAIM    Receiver Autonomous Integrity Monitoring 
RINEX    Receiver Independent Exchange Format 
ROM    Read Only Memory 
RTCA    Radio Technical Commission for Aeronautics 
RTCM    Radio Technical Commission for Maritime Services 
RTK    Real Time Kinematic 
SBAS    Satellite Based Augmentation System 
SD    Secure Digital 
SDHC    Secure Digital High Capacity 
SIM    Subscriber Identity Module  
UHF    Ultra high frequency 
VRS    Virtual Reference Station 
WAAS    Wide Area Augmentation System