| 1PPS |
One Pulse Per Second |
| 2-D or 2D |
Two Dimensional |
| 3-D or 3D |
Three Dimensional |
| AC |
Alternating Current |
| A/D |
Analog-to-Digital |
| ADC |
Analog-to-Digital Converter |
| ADR |
Accumulated Doppler Range |
| ADR |
Accumulated Delta Range |
| AGC |
Automatic Gain Control |
| AK |
Authentication Key |
| AL |
Alarm Limit |
| AltBOC |
Alternate Binary Offset Carrier |
| AMSAT |
American Satellite |
| APC |
Aircraft Power Conditioner |
| ARNS |
Aeronautical Radio Navigation Services |
| ARP |
Antenna Reference Point |
| AS |
Anti-Spoofing |
| ASCII |
American Standard Code for Information Interchange |
| ASIC |
Application Specific Integrated Circuits |
| AVL |
Automated Vehicle Locations |
| BCD |
Binary Code Decimal |
| BDE |
Borland Database Engine |
| BDS |
Black Diamond System |
| BFS |
Broadband Fiber Source |
| BIH |
Bureau l'International de l'Heure |
| BIST |
Built-In Self-Test |
| BIT |
Built-In Test |
| BNR |
Binary Numerical Representation |
| BOC |
Binary Offset Carrier |
| BPS |
Bits per Second |
| BPSK |
Bi-Phase Shift Key |
| BSG |
Baseband Signal Generator |
| BTS |
Conventional Terrestrial System (BIH defined) |
| BW |
Bandwidth |
| C/A Code |
Coarse/Acquisition Code |
| CAN |
Controller Area Network |
| CASM |
Coherent Adaptive Subcarrier Modulation |
| CBIT |
Continuous Built In Test |
| Cc |
Cubic Centimeters |
| CCITT |
Command, Control, and Intelligence Technical Test |
| CD |
Clock Drift |
| CD |
Compact Disc |
| Cd |
Change Directory |
| CDGPS |
Canada-Wide Differential Global Positioning System |
| CDMA |
Code Division Multiple Access |
| CDPD |
Cellular Digital Packet Data |
| CDU |
Control and Display Unit |
| CE |
Conformité Européenna |
| CEP |
Circular Error Probable |
| CF |
Compact Flash |
| CFGP |
Configuration Parameters |
| CISPR |
International Special Committee On Radio Interference |
| CKSC |
Clock/Status Card |
| CL |
Long Code |
| CLK |
System Clock |
| CM |
Moderate Length Code |
| CMG |
Course Made Good |
| CMP |
Comparator Message Processor |
| CMR |
Compact Measurement Record |
| C/No |
Post Correlation Carrier to Noise Ratio in dB-Hz |
| CoCom |
Coordinating Committee on Multilateral Export Controls |
| COG |
Course Over Ground |
| COGO |
Coordinate Geometry |
| COSPAS |
Cosmitscheskaja Sistema Poiska Awarinitsch Sudow (Russian: space system for search of vessels in distress) |
| CPLD |
Complex Programmable Logic Device |
| CPU |
Central Processing Unit |
| CR |
Carriage Return |
| CRC |
Cyclic Redundancy Check |
| CRR |
Common Reference Receiver |
| CS |
Commercial Service |
| CSIC |
Coordination Scientific Information Center |
| CSA |
Canada Shipping Act |
| CTP |
Conventional Terrestrial Pole |
| CTS |
Clear To Send |
| CTS |
Conventional Terrestrial System or Clear To Send |
| CW |
Continuous Wave |
| dB |
Decibel |
| dBm |
Decibel Relative to 1 milliWatt |
| DC |
Direct Current |
| DCD |
Data Carrier Detected |
| DCE |
Data Communications Equipment (Modem) |
| DCO |
Digitally Controlled Oscillator |
| DDS |
Direct Digitial Sampling |
| DGNSS |
Differential Global Navigation Satellite System |
| DGPS |
Differential Global Positioning System |
| DHCP |
Dynamic Host Configuration Protocol |
| DL |
Data Logger |
| DLL |
Delay Lock Loop |
| DoD |
Department of Defence (U.S.) |
| DOP |
Dilution Of Precision |
| DPB |
Digital Pulse Blanking |
| DR |
Dead Reckoning |
| DRAM |
Dynamic Random Access Memory |
| DRMS |
Distance Root Mean Square |
| DSP |
Digital Signal Processor |
| DSR |
Data Set Ready |
| DTE |
Data Terminal Equipment |
| DTR |
Data Terminal Ready |
| D/U |
Desired/Undesired |
| E |
Eccentricity |
| E-L |
Early to Late |
| ECEF |
Earth-Centred-Earth-Fixed |
| EDM |
Electronic Distance Measuring (instrument) |
| EEPROM |
Electrically Erasable Programmable Read Only Memory |
| EGNOS |
European Geo-Stationary Navigation System |
| EMC |
Electromagnetic Compatibility |
| EMI |
Electromagnetic Immunity |
| EP |
Engineering Practice |
| ESA |
European Space Agency |
| ESD |
Electrostatic Discharge |
| ESN |
Electronic Serial Number |
| FAA |
Federal Aviation Administration (FAA) |
| FCC |
Federal Communication Commission |
| FDA |
Frequency Distribution Amplifier |
| FDMA |
Frequency Division Multiple Access |
| FEC |
Forward Error Correction |
| FEPROM |
Flash Erasable Programmable Read Only Memory |
| FIFO |
First In, First Out |
| FKP |
Flachen Korrectur Parameter (Plane Correction Parameter) German |
| FLL |
Frequency Lock Loop |
| FMEA |
Failure Mode Effects Analysis |
| FOC |
Full Operational Capability |
| FOG |
Fibre Optic Gyro |
| FOM |
Figure of Merit |
| FPGA |
Field-Programmable Gate Array |
| FR |
Factory Reset |
| FTP |
File Transfer Protocol |
| FTS |
Frequency and Time Standard |
| FW |
Firmware |
| GAGAN |
GPS Aided GEO Augmented Navigation (India) |
| GaIn |
Galileo Industries |
| GCC |
Galileo Control Centre |
| GDOP |
Geometric Dilution Of Precision |
| GEO |
Geostationary Satellite |
| GIC |
GPS Integrity Channel |
| GL |
GLONASS (NMEA talker ID) |
| GLONASS |
Global Navigation Satellite System |
| GM |
Gauss-Markov |
| GMS |
Ground Mission Segment |
| GMT |
Greenwich Mean Time |
| GN |
Combined GPS and GLONASS (NMEA talker ID) |
| GND |
Ground |
| GNSS |
Global Navigation Satellite System |
| G.P. |
Ground Plane |
| GP |
GPS (NMEA talker ID) |
| GPAI |
General Purpose Analog Input |
| GPS |
Global Positioning System |
| GRC |
Galileo Reception Chain |
| GRCN |
Galileo Reception Chain Non-PRS |
| GSS |
Galileo Sensor Stations |
| GSTB |
Galileo System Test Bed |
| GTR |
Galileo Test Receiver |
| GTS |
Galileo Test Signal Generator |
| GUI |
Graphical User Interface |
| GUS |
Ground Uplink Station |
| GUST |
WAAS GUS-Type 1 |
| GUSTR |
WAAS GUS-Type 1 Receiver |
| HDOP |
Horizontal Dilution Of Precision |
| Hex |
Hexadecimal |
| HFOM |
Horizontal Figure of Merit |
| HMAC |
Hashed Message Authentication Code |
| HP |
High Performance (standard OmniSTAR service) |
| HTDOP |
Horizontal position and Time Dilution Of Precision |
| Hz |
Hertz |
| I and Q |
In-Phase and Quadrature (Channels) |
| I Channel |
In-phase data channel |
| IBIT |
Initiated Built In Test |
| IC |
Integrated Circuit |
| ICAO |
International Civil Aviation Organization |
| ICD |
Interface Control Document |
| ICP |
Integrated Carrier Phase |
| ID |
Identification |
| IEC |
International Electrotechnical Commission |
| IEEE |
Institute of Electrical & Electronics Engineers |
| IERS |
International Earth Rotation Service |
| IF |
Intermediate Frequency |
| IGP |
Ionospheric Grid Point |
| IGRF |
International Geometric Reference Field |
| IGS CB |
International GPS Service Central Bureau |
| IM |
Intermodulation |
| IMLA |
Integrated Multipath Limiting Antenna |
| IMO |
International Maritime Organization |
| IMU |
Inertial Measuring Unit |
| INH |
Inhibit |
| INS |
Inertial Navigation System |
| I/O |
Input/Output |
| IODE |
Issue of Data (Ephemeris) |
| IOV |
In-Orbit Validation |
| IP |
Internet Protocol |
| IRQ |
Interrupt Request |
| ISG |
IF Signal Generator |
| ISO |
International Standards Organization |
| ITRF |
International Terrestrial Reference System |
| JPL |
Jet Propulsion Laboratory (NASA) |
| JTAG |
Joint Test Action Group |
| KPA |
Klystron Power Amplifier |
| Kb |
Kilobit |
| KB |
Kilobyte |
| KMF |
Key Management Facility |
| L1 |
The 1575.42 MHz GPS carrier frequency including C/A and P-Code |
| L2 |
The 1227.60 MHz secondary GPS carrier frequency (P-Code only) |
| L2C |
The L2 civilian code transmitted at the L2 frequency (1227.6 MHz) |
| L5 |
3rd civil GPS frequency that tracks at low signal-to-noise ratios (1176.45 MHz) |
| LAAS |
Local Area Augmentation System |
| LCD |
Liquid Crystal Display |
| LED |
Light-Emitting Diode |
| LF |
Line Feed |
| LGF |
LAAS Ground Facility |
| LHCP |
Left Hand Circular Polarization |
| LME |
Line Maintenance Equipment |
| LNA |
Low Noise Amplifier |
| LO |
Local Oscillator |
| LRU |
Line Replacement Unit |
| LSB |
Least significant bit |
| LVTTL |
Low Voltage Transistor Transistor Logic |
| MAC |
Media Access Control (Ethernet) |
| MAT |
Multipath Assessment Tool |
| Mb |
Megabit |
| MB |
Megabyte |
| MEDLL® |
Multipath Estimation Delay Lock Loop |
| MEO |
Medium Earth Orbit |
| MET |
Multipath Elimination Technology |
| MET |
Meteorological |
| MGRS |
Military Grid Reference Systems |
| MHz |
MegaHertz |
| MIB |
Management Information Base |
| MIL |
Military |
| MINOS |
Multiple Independent NOmadic Stargazer |
| MKI |
Mark Input |
| MKMF |
Mission Key Management Facility |
| MMCX |
Multimedia Communications Exchange (Lucent) |
| MMT |
Multipath Mitigation Technology |
| MOPS |
Minimum Operational Performance Standard |
| MP |
Messag Processor |
| MPC |
Modulated Precision Clock |
| MPM |
Multipath Meter |
| Ms |
Millisecond |
| MSAS |
MTSAT Satellite Based Augmentation System |
| MSAT |
Mobile Satellite |
| MSB |
Most significant bit |
| MSL |
Mean sea level |
| MSR |
Measure Output |
| MTBF |
Mean Time Between Failures |
| MTSAT |
Multi-Functional Transport Satellite |
| N/A |
Not Applicable |
| NAS |
National Airspace System (United States) |
| NASA |
National Aeronautics and Space Administration (U.S.) |
| NTS |
National Topographic Series (Canada) |
| NAV |
RINEX Ephemeris File |
| NAVSTAR |
NAVigation Satellite Timing And Ranging (synonymous with GPS) |
| N/C or NC |
Not Connected |
| NCC |
Network Control Center |
| NCO |
Numerically Controlled Oscillator |
| ND |
Navigation Data |
| NH |
Neumann-Hoffman |
| NMEA |
National Marine Electronics Association |
| N. mi. |
Nautical mile |
| NOC |
Network Operations Center |
| ns |
Nanosecond |
| NVM |
Non-Volatile Memory |
| OBS |
RINEX Observation File |
| OCXO |
Oven Controlled Crystal Oscillator |
| OEM |
Original Equipment Manufacturer |
| OP |
Operational Parameters |
| OS |
Open Service |
| PAC |
Pulsed Aperture Correlator |
| PC |
Personal Computer |
| PC |
Phase Centre |
| P-Code |
Precise Code |
| PBIT |
Power-Up Built-In Test |
| PCB |
Printed Circuit Board |
| PCMCIA |
Personal Computer Memory Card International Association |
| PDC |
Power and Data Card |
| PDF |
Power Distribution Function |
| PDF |
Portable Document File |
| PDOP |
Position Dilution Of Precision |
| PE-90 |
Parameters of the Earth 1990 (see PZ90) |
| PIN |
Position Indicator |
| PLL |
Phase Lock Loop |
| PPM |
Parts Per Million |
| PPP |
Point to Point Protocol |
| PPS |
Precise Positioning Service or Pulse Per Second |
| PRN# |
PseudoRandom Noise number |
| PRS |
Public Regulated Service |
| PSN |
Part Serial Number |
| PSR |
Pseudorange |
| PV |
Position Valid |
| PVT |
Position Velocity Time |
| PZ90 |
Parametry Zemli 1990 (see PE-90) |
| Q Channel |
Quadrature data-free channel |
| RAM |
Random Access Memory |
| RAS |
Remote Access Service |
| RCC |
Rescue Co-ordination Centre |
| RF |
Radio Frequency |
| RFDC |
Radio Frequency Direct Current |
| RFU |
Radio Frequency Uplink |
| RHCP |
Right Hand Circular Polarization |
| RI |
Ring Indicator |
| RINEX |
Receiver Independent Exchange Format |
| RLG |
Ring Laser Gyro |
| RoHS |
Restriction of the use of Hazardous Substances |
| RM |
Raw Measurements |
| ROM |
Read Only Memory |
| RMA |
Return Material Authorization |
| RMS |
Root Mean Square |
| RSS |
Residual Solution Status |
| RTC |
Real-Time Clock |
| RTCA |
Radio Technical Commission for Aviation Services |
| RTCM |
Radio Technical Commission for Maritime Services |
| RTCMV3 |
RTCM Version 3.0 |
| RTK |
Real Time Kinematic |
| RTS |
Request To Send |
| RXD |
Received Data |
| SA |
SMART ANTENNA |
| SA |
Selective Availability |
| SAE |
Society of Automotive Engineers |
| SAR |
Search and Rescue |
| SARSAT |
Search and Rescue Satellite Aided Tracking |
| SBAS |
Satellite Based Augmentation System |
| SC |
Safety Computer |
| SCAT-I |
Special Category I |
| SD |
Standard Deviation |
| SEP |
Spherical Error Probable |
| SG |
Signal Generator |
| SGS-90 |
Soviet Geodetic System 1990 |
| SI |
Système Internationale |
| SigGen |
WAAS GUS Type-1 Signal Generator |
| SiS |
Signal in Space |
| SLIP |
Serial Line Internet Protocol |
| SNAS |
Satellite Navigation Augmentation System (China) |
| SNR |
Signal-to-Noise Ratio |
| SOL |
Safety-of-Life |
| SPS |
Standard Position Service |
| sps |
Symbols Per Second |
| SPAN™ |
Synchronized Position Attitude Navigation |
| SQM |
Signal Quality Monitoring |
| SRAM |
Static Random Access Memory |
| SS II |
SUPERSTAR II |
| SU |
(former) Soviet Union (now Russia) |
| SV |
Space Vehicle |
| SVID |
Space Vehicle Identifier |
| SVN |
Space Vehicle Number |
| SW |
Software |
| SWRU |
Software Replacement Unit |
| TCP |
Transmission Control Protocol |
| TCXO |
Temperature Compensated Crystal Oscillator |
| TDOP |
Time Dilution Of Precision |
| TES |
Time Estimator Status |
| TIL |
Time Integrity Limit |
| TNM |
Telecommunications Network Management |
| TOA |
Time of Almanac |
| TOE |
Time of Ephemeris |
| TOW |
Time of Week |
| TRAIM |
Time Receiver Autonomous Integrity Monitor |
| TTFF |
Time-To-First-Fix |
| TTL |
Transistor-Transistor Logic |
| TTNL |
Time to Narrow Lane |
| TVS |
Transient Voltage Suppressor |
| TXD |
Transmitted Data |
| UART |
Universal Asynchronous Receiver Transmitter |
| UDP |
User Datagram Protocol |
| UDRE |
User Differential Range Error |
| UHF |
Ultra High Frequency |
| USB |
Universal Serial Bus |
| USGS |
United States Geological Survey |
| UTC |
Coordinated Universal Time |
| UTC(SU) |
Coordinated Universal Time (former Soviet Union, now Russia |
| V AC |
Volts Alternating Current |
| V DC |
Volts Direct Current |
| VARF |
Variable Frequency |
| VBS |
Virtual Base Station (standard OmniSTAR service) |
| VCTCXO |
Voltage Controlled Temperature Compensated Crystal Oscillator |
| VDOP |
Vertical Dilution of Precision |
| VFD |
Vacuum Fluorescent Display |
| VFOM |
Vertical Figure of Merit |
| VSWR |
Voltage Standing Wave Ratio |
| WAAS |
Wide Area Augmentation System |
| WAAS G-II |
WAAS Reference Receiver: G-II |
| WADGPS |
Wide Area DGPS |
| WEEE |
Waste Electrical and Electronic Equipment |
| WGS |
World Geodetic System |
| WHQL |
Windows Hardware Quality Lab (Microsoft) |
| WMP |
WAAS Message Processor |
| WNA |
Week number of almanac |
| WPT |
Waypoint |
| XP |
Extra Performance (standard OmniSTAR service) |
| XTE |
Crosstrack Error |
| ZUPT |
Zero Velocity Update |
