ABAS | aircraft-based augmentation system |
APNT | alternate position, navigation, and time |
ARAIM | advanced receiver autonomous integrity monitoring |
ARNS | Aeronautical Radio Navigation System |
BD NAV | BeiDou navigation |
BDC | BeiDou Coordinate System |
BDT | BeiDou system time |
BOC | binary offset carrier |
BPS | bits per second |
BT | BeiDou time |
BTRF | BeiDou Terrestrial Reference Frame |
CAE | Chinese Academy of Engineering |
CBOC | composite binary offset carrier |
CDMA | code division multiple access |
CGCS 2000 | China Geodetic Coordinate System 2000 |
CL | civilian long length code |
CM | civilian moderate length code |
CNAGA | China National Administration of GNSS and Applications |
CONUS | conterminous United States |
CORS | continuously operating reference stations |
CS | clock set |
CTRF 2000 | China Terrestrial Reference Frame 2000 |
DME | distance measuring equipment |
DPE | data processing element |
EGONOS | European Geostationary Navigation Overlay Service |
FAA | U.S. Federal Aviation Administration |
FSL | free space loss |
GAGAN | GPS and geo-augmented navigation system |
GBAS | ground-based augmentation system |
GEO | geostationary Earth orbit |
GGS | GPS Geodetic System |
GIVE | grid ionospheric vertical error |
GLONASS | GLObal NAvigation Satellite System (Russia) |
GM | Gravitational Mass |
GNSS | Global Navigation Satellite Systems |
GPS | Global Positioning System |
GPST | GPS Time |
GRS | Geodetic Reference System |
HAL | horizontal alert limit |
HDOP | horizontal dilution of precision |
HMI | hazardously misleading information |
HPL | horizontal protection level |
ICAO | International Civil Aviation Organization |
ICD | interface control document |
ICG | International Committee of GNSS |
IFB | inter-frequency bias |
IFR | instrument flight rules |
iGMAS | international GNSS Monitoring and Assessment System |
IGS | International GNSS Service |
ILS | instrument landing systems |
IME | inter-measurement element |
IMU | inertial measurement unit |
INS | inertial navigation systems |
IPP | ionospheric pierce point |
IRNSS | Indian Regional Navigation Satellite System |
IRU | inertial reference units |
ITRF | International Terrestrial Reference Frame |
ITRS | International Terrestrial Reference System |
ITU | International Telecommunication Union |
LAAS | Local Area Augmentation System |
LEO | low Earth orbit |
LPV | localizer-precision with vertical guidance |
LSQ | LightSquared Corporation |
MCS | master control stations |
MEO | medium Earth orbit |
MOPS | Minimum Operational Performance Standards |
MTBF | mean time between failures |
MTTR | mean time to restoration |
MS | monitor stations |
MSAS | Multi-Functional Satellite Augmentation System |
NAE | National Academy of Engineering |
NANU | GPS Notice Advisory to Navstar Users |
NAS | National Airspace System |
NextGen | Next Generation Air Traffic Management System |
NRC | National Research Council |
NTSC | National Time Service Center |
NUTC | national universal time coordinated |
OBAD | old but active data |
OCE | outer-comparison element |
PANDA | position and navigation system data analyst |
PDOP | position dilution of precision |
PE | positioning error |
PL | protection level |
PNT | positioning, navigation, and timing |
PPD | personal privacy device |
PPP | precision point positioning |
PRN | pseudo random noise |
PVT | position, velocity, and time |
PWV | precipitable water vapor |
QZSS | Quasi-Zenith Satellite System |
RAIM | receiver autonomous integrity monitoring |
RDSS | Radio Determination Satellite Service |
RFI | radio frequency interference |
RMS | root mean square |
RNAV | radio navigation |
RNP | required navigation performance |
RNSS | regional navigation satellite service |
RO | radio occultation |
RP | relative positioning |
RTCA | Radio Technical Commission for Aeronautics |
SARPS | standard and recommended procedures |
SBAS | space-based augmentation systems |
SGE | signal generation element |
SLR | satellite laser range |
SOL | safety of life |
SoW | second of week |
TDOP | time dilution of precision |
TFS | Time and Frequency System |
Tgd | Tau group delay |
TMBOC | time multiplexed binary offset carrier |
US | upload stations |
UAT | universal access transponder |
URAE | user range acceleration error |
UDRE | user differential range error |
URE | user range error |
URRE | user range ratio error |
UTC | Coordinated Universal Time |
VAL | vertical alert limit |
VLBI | very long baseline interferometry |
VDOP | vertical dilution of precision |
VOR | VHF omni-directional range |
VPL | vertical protection level |
WAAS | Wide Area Augmentation System |
WAM | Wide Area Multilateration |
WGS | World Geodetic System |
WIPP | WAAS Integrity Performance Panel |
WN | week number |
WRS | WAAS reference station |