| ADSL |
Asymmetric Digital Subscriber Line |
| APC |
Antenna Phase Centre: The point inside a GNSS antenna to which all GNSS signals are measured. |
| APREF |
Asia-Pacific Reference Frame |
| ARP |
Antenna Reference Point: the physically accessible point on a GNSS antenna to which all measurements related to the antenna refer to. |
| BDS |
BeiDou System: GNSS of the People’s Republic of China. |
| CORS |
Continuously Operating Reference Station(s) |
| Cycle Slip |
Discontinuities in the time series of carrier-phase measurements due to the receiver temporarily losing lock on the carrier of a GNSS signal. |
| DOMES number |
Directory of MERIT Sites (DOMES): A unique geodetic marker identifier that is issued by IGN. |
| EPN |
EUREF Permanent GNSS Network |
| EUREF |
Reference Frame Sub Commission for Europe |
| Galileo |
European Union GNSS |
| GLONASS |
Globalnaja Nawigazionnaja Sputnikowaja Sistema: GNSS of the Russian Federation. |
| GNSS |
Global Navigation Satellite System: Generic term for all satellite navigation systems. |
| GPS |
Global Positioning System: GNSS of the United States |
| IGN |
Institut national de l’information géographique et forestière |
| ITRF |
International Terrestrial Reference Frame |
| Multipath |
Errors in GNSS observations are caused by reflected GNSS signals interfering with the direct GNSS signal because of their common time origin but different path lengths. |
| NavIC/IRNSS |
Navigation with Indian Constellation/Indian Regional Navigation Satellite System: RNSS of the Republic of India. |
| NRT |
Near-Real-Time (file-based) |
| NTRIP |
Networked Transport of RTCM via Internet Protocol: Application-level protocol for streaming GNSS data over the Internet. |
| ODC |
Operational Data Centre |
| PCO/PCV |
Phase Centre Offset/Phase Centre Variation |
| PDU |
Power Distribution Unit: device used for controlling electrical power. |
| QZSS |
Quasi-Zenith Satellite System: RNSS of Japan. |
| RFI |
Radio Frequency Interference |
| RINEX |
Receiver Independent Exchange Format: De-facto standard for the exchange of GNSS data independent from the vendor’s binary format. |
| RNSS |
Regional Navigation Satellite System |
| RT |
Real-Time (stream-based) |
| RTCM |
Radio Technical Commission for Maritime Services: Special Commission 104 defines international standards of radio communication and navigation using Differential GNSS. |
| SBAS |
Satellite Based Augmentation System |
| SIRGAS |
Sistema de Referencia Geodésico para las Américas |
| SNR |
Signal-to-Noise Ratio |
| UPS |
Uninterruptible Power Supply: Electrical device providing short term power in case of primary source power failures. |
| VSAT |
Very Small Aperture Terminal |
| WAN |
Wide Area Network |