A/S
|
Anti-Spoofing
|
AAIM
|
Airborne Autonomous Integrity Monitoring
|
ABAS
|
Aircraft Based Augmentation Systems
|
ACAC
|
Arab Civil Aviation Commission
|
ACF
|
Auto-Correlation Function
|
ADAS
|
Advanced Driving Assistance Systems
|
ADC
|
Analog to Digital Converter
|
ADS-B
|
Automatic Dependent Surveillance-Broadcast
|
AEP
|
Architecture Evolution Plan
|
AF
|
U.S. Air Force
|
AFCAC
|
African Civil Aviation Commission
|
AFI
|
Africa-Indian Ocean
|
AGC
|
Automatic Gain Control
|
AHRS
|
Attitude and Heading Reference Systems
|
AIS
|
Automatic Identification System
|
AIV
|
Assembly
|
AL
|
Alert Limit
|
AltBOC
|
Alternative BOC
|
AM
|
Amplitude Modulation
|
AMCS
|
Alternate Master Control Station
|
ANSP
|
Air Navigation Service Provider
|
ANTEX
|
ANtenna EXchange format
|
AOA
|
Airport Operators Association
|
AOA
|
Angle Of Arrival
|
AOAD/M
|
T Allen Osborne Associates Dorne Margolin Model T
|
AOC
|
Advanced Operational Capability
|
AOCS
|
Attitude and Orbit Control Subsystem
|
AOR
|
Atlantic Ocean Region
|
AP
|
Access Point
|
AP
|
Application Protocol
|
APC
|
Antenna Phase Centre
|
APEC
|
Asia Pacific Economic Cooperation
|
API
|
Application Programming Interface
|
APIRG
|
AFI Planning and Implementation Regional Group
|
APPS
|
Automatic Precise Positioning Service
|
APV
|
Approach oPerations with Vertical guidance
|
APVI
|
Approach oPerations with Vertical guidance I
|
APVII
|
Approach oPerations with Vertical guidance II
|
AR
|
Axial Ratio
|
ARAIM
|
Advanced RAIM
|
ARNS
|
Aeronautical Radio Navigation Service
|
ARP
|
Antenna Reference Point
|
ARPA
|
Automatic Radar Plotting Aids
|
AS
|
Anti-Spoofing
|
ASBC
|
Advanced Space Business Corporation
|
ASECNA
|
from french: Agence pour la Securite de la Navigation Aerienne en Afrique et
|
ASICs
|
Applications Secific Integrated Circuit
|
ASN.1
|
Abstract Syntax Notation 1
|
ASQF
|
Application Specific Qualification Facility
|
ASZ
|
Autocorrelation Side-lobe Zero
|
ATC
|
Air Traffic Control
|
ATM
|
Automated Teller Machine
|
ATM
|
Air Traffic Management
|
ATV
|
Automated Transfer Vehicle
|
AUC
|
African Union Commission
|
AWGN
|
Additive White Gaussian Noise
|
AWOP
|
All Weather Operations Panel
|
BC
|
Before Christ
|
BCS
|
Binary Coded Symbols
|
BDT
|
BeiDou Time
|
BI
|
Behavioral Interventions
|
BIE
|
Bureau International de l'Heure
|
BIH
|
From French: Bureau International de l'Heure
|
BIPM
|
Bureau International des Poids et Mesures
|
BLUE
|
Best Linear Unbiased Minimum-Variance Estimator
|
BM
|
Benchmark
|
BMCS
|
Backup Master Control Station
|
BOC
|
Binary Offset Carrier
|
BPSK
|
Binary Shift Phase Keying
|
BRS
|
Baricentric Reference System
|
C/A
|
Coarse/Acquisition
|
C/NAV
|
Commercial Navigation Message
|
CAASD
|
Center for Advanced Aviation System Development (MITRE)
|
CAES
|
Computer Aided Earthmoving System
|
CAN
|
Controller Area Network
|
CAR
|
Caribbean and South American region
|
CARERI
|
Chinese Aeronautical Radio Electronics Research Institute
|
CASM
|
Coherent Adaptive Sub-Carrier Modulation
|
CBCS
|
Composite Binary Coded Symbols
|
CBOC
|
Composite BOC
|
CCF
|
Central Control Facility
|
CCZ
|
Congestion Charge Zone
|
CDCM
|
Coastal Defense Cruise Missile
|
CDDIS
|
Crustal Dynamics Data Information System
|
CDDS
|
Commercial Data Distribution Service
|
CDMA
|
Code Division Multiple Access
|
CDTI
|
Cockpit Display of Traffic Information
|
CEP
|
Conventional Ephemeris Pole
|
CEP
|
Circular Error Probable
|
CF
|
Compact Flash
|
CFSP
|
Common Foreign and Security Policy
|
CGCS2000
|
China Geodetic Coordinate System 2000
|
CGSIC
|
Civil GPS Service Interface Committee
|
CHA
|
Channel of High Accuracy
|
CHAMP
|
CHAllenging Minisatellite Payload
|
CHARS
|
Customer Hierarchy And Reporting System
|
CIO
|
Conventional International Origin
|
CIP
|
Celestial Intermediate Pole
|
CIR
|
Cascading Integer Resolution
|
CIS
|
Conventional Inertial System
|
CL
|
Civil Long
|
CM
|
Civil Moderate
|
CMCF
|
Central Monitoring and Control Facility
|
CMR
|
Compact Measurement Record
|
CMSA
|
Cruise Missile Support Activity
|
CNAV
|
Civil NAVigation message
|
CNS
|
Communication Navigation Surveillance
|
CNSS
|
Compass Navigation Satellite System
|
COCESNA
|
Corporacion Centroamerica de Servicios de Navegacion Aerea
|
CODE
|
Centre for Orbit Determination in Europe
|
CONUS
|
CONtinental United States
|
CORS
|
Continuously Operating Reference Stations
|
COSMIC
|
Constellation Observing System for Meteorology
|
CP
|
Circular Polarization
|
CPF
|
Central Processing Facility
|
CPFPS
|
Central Processing Facility Processing Set
|
CPN
|
Coloured Petri Nets
|
CPU
|
Central Processing Unit
|
CR
|
Council Resolution
|
CRC
|
Cyclic Redundancy Check
|
CRF
|
Celestial Reference Frame
|
CRLB
|
Cramer Rao Lower Bound
|
CRS
|
Conventional Celestial Reference System
|
CRT
|
Cathode Ray Tube
|
CS
|
Commercial Service
|
CSA
|
Channel of Standard Accuracy
|
CSIM
|
Constellation Simulator
|
CSK
|
Code Shift Keying
|
CSRS
|
Canadian Spatial Reference System
|
CTP
|
Conventional Terrestrial Pole
|
CTS
|
Conventional Terrestrial System
|
CW
|
Continuous Wave
|
CWAAS
|
Canadian WAAS
|
DAB
|
Digital Audio Broadcasting
|
DAC
|
Digital-to-Analog Converters
|
DASS
|
Distress Alerting Satellite System
|
DCB
|
Differential Code Biases
|
DDMA
|
Doppler Division Multiple Access
|
DEOS
|
Delft Institute of Earth Observation and Space Systems
|
DF
|
Dual Frequency
|
DGNSS
|
Differential GNSS
|
DGPS
|
Differential GPS
|
DGRS
|
DGPS Reference Station
|
DH
|
Decision Height
|
DLL
|
Delay Lock Loop
|
DME
|
Distance Measuring Equipment
|
DoD
|
US Department of Defense
|
DOP
|
Dilution Of Precision
|
DOT
|
Department Of Transportation
|
DoY
|
Day-of-Year
|
DP
|
Dot Product
|
DSCS
|
Defense Satellite Communications System
|
DSNS
|
Differential Satellite Navigation Systems
|
DSP
|
Digital Signal Processor
|
DSPN
|
Direct Sequence Pseudo Noise
|
DSRC
|
Dedicated Short-Range Communications
|
DSSS
|
Direct Sequence Spread Spectrum
|
DVP
|
Development and Verification Platform
|
EASA
|
European Aviation Safety Agency
|
EC
|
European Commission
|
ECA
|
Error Characterization Approach
|
ECAC
|
European Civil Aviation Conference
|
ECAM
|
Electronic Centralised Aircraft Monitor
|
ECEF
|
Earth Centred Earth Fixed
|
ECI
|
Earth Centred Inertial
|
ECMWF
|
European Centre for Medium-Range Weather Forecasts
|
EDAS
|
EGNOS Data Access System
|
EDS
|
EGNOS Data Server
|
EEGS
|
EGNOS Extension to Eastern Europe
|
EETS
|
European Electronic Tolling Service
|
EFC
|
Electronic Fee Collection
|
EFIS
|
Electronic Flight Instrument System
|
EGNOS
|
European Geostationary Navigation Overlay System
|
EICAS
|
Engine Indications and Crew Alerting System
|
EIRP
|
Effective Isotropic Radiated Power
|
E-L
|
Early-Late
|
ELT
|
Emergency Location Terminal
|
EMLP
|
Early Minus Late Power
|
EMP
|
Electro-Magnetic Pulse
|
EMR
|
Energy Mines and Resources
|
EMT
|
Effective Monitor Threshold
|
ENC
|
European Navigation Conference
|
ENT
|
EGNOS Network Time
|
ENU
|
East North Up
|
EOL
|
End-Of-Life
|
EOP
|
Earth Orientation Parameters
|
EPFS
|
Electronic Position Fixing System
|
EPIRB
|
Emergency Position Indicating Radio Beacons
|
EPPP
|
Enhanced Precise Point Positioning
|
ERIS
|
External Regional Integrity Services
|
ERP
|
Earth Rotation Parameters
|
ERTMS
|
European Rail Traffic Management System
|
ESA
|
European Space Agency
|
ESDP
|
European Security and Defence Policy
|
ESOC
|
European Space Operations Centre
|
ESSP
|
European Satellite Service Provider
|
ESTB
|
EGNOS Test Bed
|
ET
|
Ephemeris Time
|
ETA
|
Estimated Time of Arrival
|
ETC
|
Electronic Tolling Collection
|
ETCS
|
European Train Control System
|
ETML
|
European Traffic Management Layer
|
ETSO
|
European Technical Standard Order
|
EU
|
European Union
|
EuCAP
|
European Conference on Antennas and Propagation
|
EWAN
|
EGNOS Wide Area Network
|
F/NAV
|
Freely accessible Navigation Message
|
FAA
|
Federal Aviation Administration
|
FAS
|
Final Approach Segments
|
FDE
|
Fault Detection and Exclusion
|
FDF
|
Flight Dynamics Facility
|
FDMA
|
Frequency Division Multiple Access
|
FEC
|
Forward Error Correction
|
FH
|
Faded-Harmonics
|
FIR
|
Flight Information Region
|
FIR
|
Finite Impulse Response
|
FKP
|
From German: Flaechen Korrektur Parameter
|
FLL
|
Frequency Lock Loop
|
FM
|
Frequency Modulation
|
FMS
|
Flight Management System
|
FOC
|
Full Operational Capability
|
FOP
|
Final Operational Phase
|
FPGA
|
Field Programmable Gate Array
|
F-PPP
|
Fast Precise Point Positioning
|
FTP
|
File Transfer Protocol
|
G/NAV
|
Governmental Navigation Message
|
GA
|
Ground Antennas
|
GACF
|
Ground Assets Control Facility
|
GADEROS
|
Galileo Demonstrator for Railway Operation System
|
gAGE
|
Research group of Astronomy and GEomatics
|
GAST
|
Greenwich Apparent Sidereal Time
|
GBAS
|
Ground-Based Augmentation System
|
GCC
|
Ground Control Centres
|
GCS
|
Ground Control Segment
|
GDOP
|
Geometric Dilution Of Precision
|
GEAS
|
GNSS Evolutionary Architecture Study
|
GEO
|
Geostationary Orbit
|
GESS
|
Galileo Experimental Sensor Stations
|
GGSP
|
Galileo Geodetic Service Provider
|
GIC
|
GNSS/Ground Integrity Channel
|
GIM
|
Global Ionospheric Maps
|
GIOVE
|
Galileo In-Orbit Validation Element
|
GIS
|
Geographic Information System
|
GIT
|
GNSS Implementation Team
|
GIVD
|
Grid Ionospheric Vertical Delay
|
GIVE
|
Grid Ionospheric Vertical Error
|
GIVEI
|
GIVE Indicators
|
GJU
|
Galileo Joint Undertaking
|
GLA
|
General Lighthouse Authorities
|
GLONASS
|
GLObal NAvigation Satellite System
|
GLONASST
|
GLONASS Time
|
GLP
|
Good Laboratory Practice
|
GLS
|
GNSS Landing System
|
GMDSS
|
Global Maritime Distress and Safety System
|
GMS
|
Ground Mission Segment
|
GMSK
|
Gaussian Minimum Shift Keying
|
GMST
|
Greenwich Mean Sidereal Time
|
GMT
|
Greenwich Mean Time
|
GNS
|
Global Navigation System
|
GNSS
|
Global Navigation Satellite System
|
GNSSP
|
GNSS Panel
|
GOC
|
Galileo Operating Company
|
GPRS
|
General Packet Radio Service
|
GPS
|
Global Positioning System
|
GPS/MET
|
Global Positioning System/Meteorology
|
GPSOC
|
GPS Operations Center
|
GPST
|
GPS Time
|
GPSW
|
GPS Wing
|
GRACE
|
Gravity Recovery And Climate Experiment
|
GRAPHIC
|
Group and Phase Ionospheric Calibration
|
GRAS
|
Ground-based Regional Augmentation System
|
GRS
|
Geodetic Reference System
|
GRSP
|
Galileo Geodetic Reference Service Provider
|
GSA
|
European GNSS Agency
|
GSLV
|
Geosynchronous Satellite Launch Vehicle
|
GSM
|
Global System for Mobile communication
|
GSO
|
Geostationary Satellites Orbit
|
GSS
|
Galileo Sensor Stations
|
GST
|
Galileo System Time
|
GTRF
|
Galileo Terrestrial Reference Frame
|
GUS
|
Ground Uplink Stations
|
HAL
|
Horizontal Alert Limit
|
HD
|
Hydrostatic Delay
|
HD
|
Hard Disk
|
HDOP
|
Horizontal Dilution Of Precision
|
HEO
|
Highly Elliptical Orbit
|
HF
|
High Frequency
|
HIS
|
High Integrity Service
|
HMI
|
Hazardous Misleading Information
|
HP
|
High Precision
|
HPA
|
High Power Amplifier
|
HPE
|
Horizontal Position Error
|
HPL
|
Horizontal Protection Level
|
HPPS
|
High Precision Positioning Service
|
HPS
|
High Precision Service
|
HTML
|
Hyper Text Markup Language
|
I/NAV
|
Integrity Navigation Message
|
IAEA
|
International Atomic Energy Agency
|
IAG
|
International Association of Geodesy
|
IAS
|
Institut Aero Spatial
|
IAU
|
International Astronomical Union
|
IBPL
|
Isotropy Based Protection Level
|
IBS
|
Integrated Bridge Systems
|
IC
|
Integrated Chips
|
ICAO
|
International Civil Aviation Organization
|
ICC
|
Institut Cartografic de Catalunya
|
ICD
|
Interface Control Document
|
ICG
|
International Committee on Global Navigation Satellite Systems
|
ICR
|
Isotropic Confidence Ratio
|
ICRF
|
International Celestial Reference Frame
|
ICRS
|
International Celestial Reference System
|
ICS
|
Internal Communication Subsystem
|
IDF
|
Ionospheric Disturbance Flag
|
IEP
|
Initial Experimental Phase
|
IERS
|
International Earth Rotation and Reference Systems Service
|
IF
|
Intermediate Frequencies
|
IGEX
|
International GLONASS EXperiment
|
IGP
|
Ionospheric Grid Point
|
IGS
|
International GNSS Service
|
IGSO
|
Inclined Geo-Synchronous Orbit
|
ILRS
|
IRNSS Laser Ranging Station
|
ILS
|
Instrument Landing Systems
|
IM
|
Inter Modulation
|
IMO
|
International Maritime Organization
|
IMU
|
Inertial Measurement Unit
|
INC
|
IRNSS Navigation Centre
|
INLUS
|
Indian Land Uplink Station
|
INMCC
|
Indian Master Control Center
|
INRES
|
Indian REference Stations
|
INS
|
Inertial Navigation System
|
IOC
|
Initial Operational Capability
|
IOD
|
Issues of Data
|
IODC
|
Issue of Data Clock
|
IODE
|
Issue Of Data Ephemeris
|
IODF
|
Issue Of Data Fast Corrections
|
IODI
|
Issue of Data IGP Mask
|
IODN
|
Issue of Data Navigation
|
IODP
|
Issue Of Data PRN mask
|
IODS
|
Issue of Data Service Message
|
ION
|
Institute Of Navigation
|
IONEX
|
IONosphere map EXchange format
|
ION-NTM
|
ION National Technical Meeting
|
IOR-W
|
Indian Ocean Region West
|
IOT
|
In-Orbit Test
|
IOV
|
In-Orbit Validation
|
IP
|
Internet Protocol
|
IPF
|
Integrity Processing Facility
|
IPP
|
Ionospheric Pierce Point
|
IRCDR
|
IRNSS CDMA Ranging Stations
|
IRDCN
|
IRNSS Data Communication Network
|
IRIMS
|
IRNSS Range and Integrity Monitoring Stations
|
IRN
|
Information Request Notice
|
IRNSS
|
Indian Regional Navigational Satellite System
|
IRNWT
|
IRNSS Timing Centre
|
IRTTC
|
IRNSS TTC and Uplinking Stations
|
ISI
|
Inter Symbol Interference
|
ISM
|
Integrity Support Message
|
ISRO
|
Indian Space Research Organization
|
ISS
|
International Space Station
|
ITR
|
International Terrestrial Reference
|
ITRF
|
International Terrestrial Reference Frame
|
ITRS
|
International Terrestrial Reference System
|
ITU
|
International Telecommunications Union
|
ITU-R
|
International Telecommunications Union Radiocommunication Sector
|
IWG
|
Interoperability Working Group
|
JAXA
|
Japan Aerospace Exploration Agency
|
JD
|
Julian Day
|
JLOC
|
Jammer Location
|
JMA
|
Japan Meteorological Agency
|
JPL
|
Jet Propulsion Laboratory
|
KH
|
Kelvin-Helmholtz
|
KMF
|
Key Management Facility
|
L2CL
|
L2 Civil Long
|
L2CM
|
L2 Civil Moderate
|
LAAS
|
Local Area Augmentation System
|
LAST
|
Local Apparent Sidereal Time
|
LBS
|
Location Based Services
|
LCA
|
Liability Critical Applications
|
LCD
|
Liquid Crystal Display
|
LEO
|
Low Earth Orbit
|
LEOP
|
Launch Early OPerations
|
LEX
|
Michibiki experimental signal
|
LFSR
|
Linear Feedback Shift Registers
|
LHCP
|
Left Hand Circular Polarization
|
LM
|
Local Mean
|
LMST
|
Local Mean Sidereal Time
|
LNA
|
Low Noise Amplifier
|
LNAV
|
Lateral Navigation
|
LO
|
Local Oscillator
|
LOC
|
Linear Offset Carrier
|
LOS
|
Line-Of-Sight
|
LP
|
Localizer Performance
|
LPV
|
Localizer Performance with Vertical guidance
|
LRIT
|
Long Range Identification and Tracking
|
LT
|
Long Term
|
LVP
|
Low Visibility Procedures
|
MASPS
|
Minimum Aviation System Performance Standards
|
MBOC
|
The Multiplexed Binary Offset Carrier
|
MCC
|
Mission Control Centers
|
MCS
|
Master Control Station
|
MCS
|
Multilevel Coded Spreading Symbols
|
MEAG
|
Mission Evolution Advisory Group
|
MEDLL
|
Multipath Estimating Delay Lock Loop
|
MEH
|
Marine Electronic Highway
|
MEO
|
Medium Earth Orbit
|
MEOSAR
|
Medium Earth Orbit Search And Rescue
|
METIS
|
Mediterranean Introduction of GNSS Services
|
MGF
|
Message Generation Facility
|
MHSS
|
Multiple Hypothesis Solution Separation
|
MI
|
Misleading Information
|
MJD
|
Modified Julian Day
|
MLS
|
Microwave Landing System
|
MLU
|
MRS Land User service
|
MM
|
Monument Marker
|
MMI
|
Man Machine Interface
|
MMSSS
|
Multi-Mode Spread-Spectrum Sub-carrier Modulation
|
MNAV
|
Military NAVigation Message
|
MOB
|
Man Overboard
|
MODIP
|
MOdified DIP latitude
|
MOPS
|
Minimum Operational Performance Specification
|
MPR
|
MultiPath Ratio
|
MPSK
|
Multiple Phase Shift Keying
|
MRA
|
Measurement Rejection Approach
|
MRS
|
Multi-Constellation Regional System
|
MS
|
Monitor Stations
|
MSAS
|
MTSAT Satellite Augmentation System
|
MSC
|
Mobile Satellite Communications
|
MSD
|
Minimum Set of Data
|
MSE
|
Mean-Square Error
|
MSF
|
Mission Support Facility
|
MSI
|
Misleading Signal-in-Space Information
|
MSK
|
Minimum Shift Keying
|
MSTID
|
Medium Scale Traveling Ionospheric Disturbances
|
MT
|
Military Tracking
|
MT
|
Message Type
|
MT0
|
Message Type 0
|
MT1
|
Message Type 1
|
MT2
|
Message Type 2
|
MT3
|
Message Type 3
|
MT4
|
Message Type 4
|
MT5
|
Message Type 5
|
MTPF
|
Maintenance and Training Platform
|
MTSAT
|
Multifunctional Transport Satellite
|
MUCF
|
Mission Uplink Control Facility
|
NAD83
|
North American Datum of 1983
|
NANUs
|
Notice Advisory to Navstar Users
|
NAPEOS
|
Navigation Package for Earth Observation Satellites
|
NAS
|
National Airspace System
|
NASA
|
National Aeronautics and Space Administration
|
NAV
|
Navigation Message
|
NAVCEN
|
NAVigation CENter
|
NCA
|
Non-Critical applications
|
NCO
|
Numerical Control Oscillators
|
NDB
|
Non-Directional Beacon
|
NDGPS
|
Nationwide Differential Global Positioning System
|
NELP
|
Non-coherent Early minus Late Power
|
NEU
|
North-East-Up
|
NGA
|
National Geospatial-Intelligency Agency
|
NIST
|
National Institute of Standards and Technology
|
NLES
|
Navigation Land Earth Stations
|
NLOS
|
Non Line Of Sight
|
NMCS
|
New Master Control Station
|
NMEA
|
National Marine Electronics Association
|
NOCC
|
National Operations Control Center
|
NOTAM
|
NOTice to AirMen
|
NPA
|
Non-Precision Approach
|
NPV
|
Non Precision Approach with vertical guidance
|
NRTK
|
Network RTK
|
NRZ
|
Non-Return to Zero
|
NSE
|
Navigation System Error
|
NSP
|
Navigation System Panel
|
NSU
|
Navigation Signal generator Unit
|
NSV
|
Near Space Vehicle
|
NTRIP
|
Networked Transport of RTCM via Internet Protocol
|
OA
|
Operational Advisories
|
OBD
|
On-Board diagnostics
|
OBU
|
On Board Unit
|
OCC
|
Operational Control Centers
|
OCS
|
Operational Control System
|
OCX
|
Operational Control Segment
|
OD&TS
|
Orbit Determination and Time Synchronisation
|
ODTS
|
Orbit Determination and Time Synchronisation
|
OEM
|
Original Equipment Manufacturer
|
OLAF
|
from French: Office de Lutte Anti-Fraude
|
ONCE
|
Spanish organisation for the blind
|
OPF
|
Operations Preparation Facility
|
OQPSK
|
Offset QPSK
|
ORMS
|
Orbiter and Radio Metric Systems
|
OS
|
Open Service
|
OS
|
Operative System
|
OSD
|
Open Signal Data
|
OSP
|
Open Signal Pilot
|
OSPF
|
Orbit determination and Synchronization Processing Facility
|
OTF
|
On-The-Fly
|
PA
|
Precision Approach
|
PACF
|
Performance Assessment and Checkout Facility
|
PANS
|
Procedures for Air Navigation Services
|
PAYD
|
Pay-As-You-Drive
|
PBN
|
Performance-Based Navigation
|
PCV
|
Phase Centre Variations
|
PDA
|
Personal Digital Assistant
|
PDF
|
Portable Document Format
|
PDM
|
Position Domain Monitoring
|
PDOP
|
Position Dilution Of Precision
|
PE
|
Protection Error
|
PFD
|
Primary Flight Display
|
PL
|
Protection Level
|
PLANS
|
Position Location and Navigation Symposium
|
PLL
|
Phase Lock Loop
|
PM
|
Phase Modulation
|
PND
|
Portable Navigation Devices
|
PNG
|
Portable Network Graphics
|
PNT
|
Positioning
|
POD
|
Precise Orbit Determination
|
POI
|
Point Of Interest
|
PPP
|
Precise Point Positioning
|
PPS
|
Precise Point Service
|
PR
|
Pseudo Random
|
PRN
|
Pseudo-Random Noise
|
PRS
|
Public Regulated Service
|
PRTODTS
|
Precise Real Time Orbit Determination and Time Synchronization
|
PS
|
Precision Service
|
PSD
|
Power Spectral Density
|
PSK
|
Phase-Shift Keying
|
PSTD
|
Pseudospectral Time-Domain
|
PTC
|
Positive Train Control
|
PTF
|
Precision Timing Facility
|
PTP
|
Point-To-Point
|
PVT
|
Position
|
PZ-90
|
Parametry Zemli 1990 (Parameters of the Earth 1990)
|
QOS
|
Quality Of Service
|
QPSK
|
Quadrature Phase-Shift Keying
|
QPSM
|
Quadrature Product Sub-carrier Modulation
|
QZSS
|
Quasi-Zenith Satellite System
|
RAAN
|
Right Ascension of the Ascending Node
|
RAIM
|
Receiver Autonomous Integrity Monitoring
|
RC
|
Rased Cosine
|
RCF
|
Raised Cosine Filter
|
RDS
|
Radio Data System
|
RDSS
|
Radio Determination Satellite Service
|
RECs
|
Regional Economic Communities
|
RF
|
Radio Frequency
|
RFC
|
Radio Frequency Compatibility
|
RFI
|
Radio Frequency Interference
|
RFID
|
Radio-Frequency Identification
|
RHCP
|
Right Hand Circular Polarization
|
RICS
|
Royal Institution of Chartered Surveyors
|
RIMS
|
Ranging Integrity Monitoring Stations
|
RINEX
|
Receiver INdependent EXchange format
|
RK4
|
4th order Runge-Kutta
|
RMS
|
Root Mean Square
|
RNAV
|
aRea NAVigation
|
RNP
|
Required Navigation Performance
|
RNSS
|
Radionavigation Satellite System
|
RRAIM
|
Relative RAIM
|
RRC
|
Range Rate Corrections
|
RRC
|
Root Raised Cosine
|
RSA
|
Russian Space Agency
|
RSIM
|
Reference Stations and Integrity Monitors
|
RSN
|
Reference Stations Network
|
RTCM
|
Radio Technical Commission for Maritime Services
|
RTK
|
Real-Time Kinematics
|
RUC
|
Road User Charging
|
RX
|
Receiver
|
S/A
|
Selective Availability
|
SA
|
Select Availability
|
SACCSA
|
From Spanish: Soluci
|
SAIF
|
Submeter-class Augmentation with Integrity Function
|
SAM
|
South America Region
|
SAR
|
Search and Rescue
|
SARPs
|
Standard and Recommended Practices
|
SBAS
|
Satellite-Based Augmentation System
|
SBCS
|
Sinusoidal Binary Coded Symbols
|
SCA
|
Safety Critical Applications
|
SCC
|
System Control Centre
|
SCC
|
Spacecraft Control Centre
|
SCCF
|
Spacecraft and Constellation Control Facility
|
SCPF
|
Spacecraft and Constellation Planning Facility
|
SDA
|
System Design Approval
|
SDCM
|
System of Differentional Correction and Monitoring
|
SDD
|
Service Definition Document
|
SDR
|
Software Defined Radio
|
SEP
|
Spherical Error Probable
|
SF
|
Single Frequency
|
SGLS
|
Space Ground Link Subsystem
|
SI
|
International System of Physical Units
|
SINEX
|
Solution (Software/technique) INdependent EXchange format
|
SIS
|
Signal In Space
|
SISA
|
Signal-in-Space Accuracy
|
SISE
|
SIS Error
|
SISMA
|
SIS Monitoring Accuracy
|
SLR
|
Satellite Laser Ranging Station
|
SMCS
|
Sinusoidal Multilevel Coded Symbol
|
SMS
|
Short Message Service
|
SNAS
|
Satellite Navigation Augmentation System
|
SNIR
|
Signal to Noise plus Interference Ratio
|
SNR
|
Signal to Noise Ratio
|
SNT
|
SBAS Network Time
|
SOC
|
Sinusoidal Binary Offset Carrier
|
SoL
|
Safety-of-Life
|
SOLAS
|
Safety of Life at Sea
|
SOTDMA
|
Self-Organizing Time Division Multiple Access
|
SP
|
Service Provider
|
SP3
|
Standard Product #3
|
SPAC
|
Satellite Positioning Research and Application Center
|
SPD
|
Slant Path Delay
|
SPEED
|
Support Platform for EGNOS Evolutions and Demonstrations
|
SPF
|
Service Product Facility
|
SPP
|
Standard Point Positioning
|
SPS
|
Standard Positioning Service
|
SQM
|
Signal Quality Monitoring
|
SRD
|
System Requirement Document
|
SRIF
|
Square-Root Information Filtering
|
SRRC
|
Square-Root Raised Cosine
|
SS
|
Spread Spectrum
|
SSC
|
Spectral Separation Coefficient
|
SSEG
|
Space Segment
|
SSTL
|
Surrey Satellite Technology Ltd.
|
ST
|
Short Term
|
STC
|
aircraft Supplemental Type Certificates
|
STEC
|
Slant Total Electron Content
|
STF
|
Signal Task Force
|
SU
|
Soviet Union
|
SUPPs
|
regional SUPplementary Procedures
|
SV
|
Space Vehicle
|
SVN
|
Space Vehicle Number
|
SW
|
Synchronization Words
|
SW
|
Software
|
TACAN
|
TACtical Air Navigation
|
TAI
|
From French: Temps Atomique International
|
TBD
|
see TCB
|
TCA
|
Terminal Control Area
|
TCAR
|
Three-Carrier Ambiguity Resolution
|
TCAS
|
Traffic Collision Avoidance System
|
TCB
|
from French: Temps Coordonnee Barycentrique
|
TCG
|
from French: Temps Coordonnee Geocentrique
|
TDARDS
|
Truth Data Acquisition
|
TDB
|
from French: Temps Dinamique Barycentrique
|
TDOP
|
Time Dilution Of Precision
|
TDS
|
Technology Demonstration System
|
TDT
|
Terrestrial Dynamic Time
|
TEC
|
Total Electron Content
|
TECU
|
Total Electron Content Unit
|
TGD
|
Total Group Delay
|
TLM
|
TeLeMetry
|
TLS
|
Target Level of Safety
|
TMBOC
|
Time-Multiplexed BOC
|
TMR
|
Triple Modular Redundancy
|
TOW
|
Time Of Week
|
TRF
|
Terrestrial Reference Frame
|
TRS
|
Conventional Terrestrial Reference System
|
TS
|
Time Synchronisation
|
TSO
|
Technical Standard Order
|
TT
|
Terrestrial Time
|
TT&C
|
Telemetry
|
TTA
|
Time-To-Alert
|
TTC
|
Telemetry
|
TTFF
|
Time To First Fix
|
TUS
|
Test User Segment
|
TV
|
Television
|
TX
|
Transmitter
|
U.S.
|
United States
|
UAV
|
Unmanned Aerial Vehicle
|
UCAR
|
University Corporation of Atmospheric Research
|
UDRE
|
User Differential Range Error
|
UDREI
|
UDRE Indicator
|
UEN
|
Up-East-North
|
UERE
|
User Equivalent Range Error
|
UIRE
|
User Ionospheric Range Error
|
UK
|
United Kingdom
|
ULS
|
Mission Uplink Stations
|
UMTS
|
Universal Mobile Telecommunications System
|
UNB
|
University of New Brunswick
|
UNE
|
Up North East
|
UNECA
|
United Nations Economic Commission for Africa
|
UNISPACE
|
United Nations Conference on the Exploration and Peaceful Uses of Outer Space
|
UPC
|
Technical University of Catalonia
|
URA
|
User Range Accuracy
|
URE
|
User Range Error
|
US
|
United States
|
USA
|
United States of America
|
USB
|
Universal Serial Bus
|
USCG
|
U.S. Coast Guard
|
USNDS
|
US Nuclear Detonation (NuDet) Detection System
|
USNO
|
United States Naval Observatory
|
UT
|
Universal Time
|
UT0
|
Universal Time 0
|
UT1
|
Universal Time 1
|
UT2
|
Universal Time 2
|
UTC
|
Universal Time Coordinated
|
UV
|
Ultra Violet
|
VAL
|
Vertical Alert Limit
|
VDB
|
VHF Data Broadcast
|
VDLL
|
Vector DLL
|
VDOP
|
Vertical Dilution Of Precision
|
VE
|
Very Early
|
VHF
|
Very High Frequency
|
VL
|
Very Late
|
VLBI
|
Very Long Baseline Interferometry
|
VNAV
|
Vertical Navigation
|
VOR
|
VHF Omnidirectional Range
|
VPE
|
Vertical Position Error
|
VPL
|
Vertical Protection Level
|
VRS
|
Virtual Reference Station
|
VTS
|
Vessel Traffic Service
|
WAAS
|
Wide Area Augmentation System
|
WAD
|
Wide Area Differential
|
WADGPS
|
Wide Area Differential GPS
|
WAGE
|
Wide Area GPS Enhancements
|
WAN
|
Wide Area Network
|
WAP
|
Wireless Application Protocol
|
WARTK
|
Wide Area Real-Time Kinematics
|
WARTK-EGAL
|
Wide Area Real-Time Kinematics based on EGNOS and Galileo
|
WG
|
World Geodetic
|
WG
|
Working Group
|
WGS
|
World Geodetic System
|
WGS84
|
World Geodetic System 84
|
WLS
|
Weighted Least Square
|
WMS
|
WAAS Master Station
|
WRC
|
World Radio Conference
|
WRS
|
Wide-area Reference Stations
|
XPE
|
Vertical/ Horizontal Protection Error
|
XPL
|
Vertical/ Horizontal Protection Level
|
ZHD
|
Zenith Hydrostatic Delay
|
ZPD
|
Zenith Path Delay
|
ZTD
|
Zenith Tropospheric Delay
|
ZWD
|
Zenith Wet Delay
|