| Numeric |
| 1D-Var | One-dimensional variational analysis | |
| 3D-Var | Three-dimensional variational analysis | |
| 4D-Var | Four-dimensional variational analysis | |
| A |
| A/S | Anti-Spoofing (a mode that the GPS satellites are usually in, which degrades the accuracy of pseudorange and carrier phase on the L2 signal) | |
| AAPP | ATOVS and AVHRR processing package | |
| ADD | Architectural Design Document | |
| AFG | Administration and Finance Group (of EUMETSAT) | |
| AIRS | Atmospheric Infrared Sounder | |
| AMSU | Advanced Microwave Sounding Unit | |
| AMV | Atmospheric motion vector (satellite wind) | |
| ARS | Assisted Raw Sampling | |
| ASCAT | Advanced Scatterometer | |
| ATOVS | Advanced TOVS | |
| AVHRR | Advanced Very High Resolution Radiometer (for visible and infrared imagery, flown in polar orbit) | |
| B |
| BUFR | Binary Universal Form for the Representation of meteorological data (A WMO standard data format for weather observations) | |
| C |
| C/NOFS | Communications/Navigation Outage Forecasting System | |
| CA | Cooperation Agreements | |
| CDAAC | The COSMIC Data Analysis and Archive Center | |
| CDOP | Continous Development andn Operations Phase | |
| CGMS | Coordination Group for Meteorological Satellites | |
| CGS | Core Ground Segment | |
| CHAMP | Challenging Mini--Satellite Payload | |
| CM | Configuration Management | |
| CM SAF | Climate Monitoring SAF | |
| CMP | Configuration Management Plan | |
| CNES | Centre National d'Etudes Spatiales (of France) | |
| COSMIC | Constellation Observing System for Meteorology, Ionosphere and Climate | |
| CT | Canonical Transform | |
| CT2 | Canonical Transform (of type 2) | |
| CVS | Concurrent Version System | |
| D |
| DADF | Data Acquisition and Dissemination Facility | |
| DCP | Data Collection Platform | |
| DD | Double Differenceing | |
| DD2 | Double Differenceing (with two fiducial stations) | |
| DMI | Danish Meteorological Institute | |
| DMSP | Defense Meteorological Satellite Program (USA) | |
| DoD | US Department of Defense | |
| DOP | Detailed Operational Proposal | |
| DPDD | Detailed Products Description Document | |
| DRI | Delivery Readiness Inspection | |
| DWD | Deutscher Wetterdienst | |
| E |
| E-GVAP | European GPS Water Vapour | |
| ECMWF | European Centre for Medium-Range Weather Forecasts | |
| ED | Extended Development | |
| EDP | Extended Development Phase | |
| EGM96 | Earth Gravity Model - 1996 (Lemoine et al, 1998) | |
| EGOPS | End-to-end GNSS Occultation Performance Simulator | |
| ENG | Engineering | |
| ENVISAT | Environmental Satellite | |
| EOS Earth | Observing System | |
| Ephemeris | A table showing a satellite's location over time | |
| EPS | EUMETSAT Polar Satellite System | |
| EPS/PP | EPS Preparatory Programme | |
| EQUARS | Equatorial Atmosphere Research Satellite | |
| ERS | European Remote Sensing satellite | |
| ESA | European Space Agency (Paris, France) | |
| ESOC | European Space Operations Centre (Darmstadt, Germany) | |
| ESTEC | European Space Research and Technology Centre (Noordwijk, The Netherlands) | |
| EUCOS | EUMETNET Network of European Observing System | |
| EUMETCast | EUMETSAT's dissemination system | |
| EUMETSAT | European Organisation for the Exploitation of Meteorological Satellites | |
| EUMITS | EUMETSAT on-line Invitation to Tender System | |
| EURD | End User Requirements Document | |
| F |
| Fiducial | Fiducial sites are fixed GPS receivers on the ground, against which data from the satellite can be differenced | |
| FM | Forward Model | |
| FSI | Full Spectrum Inversion | |
| G |
| GALILEO | European GNSS constellation project (EU) | |
| GCOS | Global Climate Observing System | |
| GLONASS | Global Navigation Satellite System (Russia) | |
| GMES | Global Monitoring for Environment and Security | |
| GNSS | Global Navigation Satellite System | |
| GOES | Geostationary Operational Environmental Satellite (USA) | |
| GOME | Global Ozone Monitoring Experiment | |
| GPAC | GNSS RO Processing and Archiving Centre (formerly GRAS Processing and Archiving Centre) | |
| GPS | Global Positioning System (USA) | |
| GPS POD | GPS Precise Orbit Determination products | |
| GPS/MET | GPS/Meteorology Experiment on Microlab-1 (USA) | |
| GPSOS | GPS Occultation Sensor | |
| GPSPP | GPS Processing Package | |
| GPSWV | GPS for Water Vapour | |
| GRACE | Gravity Recovery and Climate Experiment | |
| GRAS | GNSS Receiver for Atmospheric Sounding | |
| GRAS GSN | Term used for the GRAS network of the fiducial ground stations | |
| GRAS POD | GRAS Precise Orbit Determination products | |
| GRAS SAF | Former name of the ROM SAF | |
| GSN | Ground Support Network | |
| GSN SSD | Term used for the set of data from the GSN | |
| GTS | Global Telecommunication System | |
| H |
| HIRLAM | High Resolution Limited Area Model | |
| HIRS | High Resolution Infrared Radiation Sounder | |
| HR | High Rate data (used for data taken at a rate of 50 observations per second; these are used for measurement of the stratosphere and troposphere) | |
| HRIT | High Rate Information Transmission | |
| HRPT | High Rate Picture Transmission | |
| I |
| IASI | Infrared Atmospheric Sounding Interferometer | |
| ICD | Interface Control Document | |
| IEEC | Institut d'Estudis Espacials de Catalunya | |
| IGOS | Integrated Global Observation Strategy | |
| IGS | International Geodynamics Service | |
| IJPS | Initial Joint Polar System | |
| IOP | Initial Operational Proposal | |
| ISO | International Organization for Standardization | |
| IU | Interaction with Users | |
| J |
| JOP | Joint Operation Procedure | |
| JPL | Jet Propulsion Laboratory | |
| K |
| KNMI | Koninklijk Nederlands Meteorologisch Instituut | |
| L |
| L1 | GPS carrier frequency, 1575.42 MHz | |
| L2 | GPS carrier frequency, 1227.60 MHz | |
| LEO | Low Earth Orbit | |
| LEOP | Launch and Early Orbit Phase | |
| LR | Low Rate data (observations taken once every ten seconds, used to calculate the satellite's orbit) | |
| LRIT | Low Rate Information Transmission | |
| LRPT | Low Rate Picture Transmission | |
| M |
| M&C | Management and Coordination | |
| MARF | Meteorological Archive and Retrieval Facility | |
| Meteosat | EUMETSAT geostationary meteorological satellite | |
| MetO | United Kingdom Meteorological Office (aka Met Office) | |
| Metop | Meteorological Operational Polar satellite (EUMETSAT Polar System spacecraft) | |
| Metop POD | Metop Precise Orbit Determination products | |
| MG | Management | |
| MHS | Microwave Humidity Sounder | |
| MPEF | Meteorological Products Extraction Facility (EUMETSAT) | |
| MSC | Meteorological Service of Canada | |
| MSG | Meteosat Second Generation | |
| MTP | Meteosat Transition Programme | |
| N |
| NASA | National Aeronautics and Space Administration (USA) | |
| NCAR | National Center for Atmospheric Research, a division of UCAR | |
| NESDIS | National Environmental Satellite Data and Information Service (of NOAA) | |
| NMC/NCEP | National Meteorological Center / National Center for Environmental Prediction | |
| NMS | National Meteorological Service | |
| NOAA | National Oceanic and Atmospheric Administration (USA) | |
| NPOESS | National Polar-Orbiting Operational Environmental SAtellite System (NOAA) | |
| NRT | Near real time | |
| NSPO | Taiwan National Space Program Office | |
| NWP | Numerical Weather Prediction | |
| O |
| O3M SAF | Ozone SAF | |
| OFL | Offline | |
| OGS | Overall Ground Segment | |
| OICD | Operational Interface Control Document | |
| OL | Open Loop | |
| OPS | Operations | |
| OR | Operations Review | |
| ORR | Operations Readiness Review | |
| OSI SAF | Ocean & Sea-Ice SAF | |
| P |
| PAC | Policy Advisory Committee (of EUMETSAT) | |
| PCR | Products Consolidation Review | |
| PFS | Product Format Specification (EUMETSAT) | |
| PGS | Primary Ground Station | |
| POD | Precise Orbit Determination | |
| PP | Projects Plan | |
| PPF | Product Processing Facility | |
| PRN | Pseudo-Random Noise (one of 32 possible "gold codes" assigned to each GPS satellite; the PRN number is used in this database to identify different GPS satellites) | |
| PT | Project Team | |
| PVR | Product Validation Report | |
| Q |
| QC | Quality Control | |
| QI | Quality Indicator | |
| R |
| RINEX | Receiver Independent Exchange Format (a standard file format for storing the observations of GPS receivers) | |
| RMDCN | Regional Meteorological Data Communication Network | |
| RMS | Root Mean Square | |
| RO | Radio Occultation | |
| ROM SAF | Radio Occultation Meteorology SAF (former GRAS SAF) | |
| ROPP | Radio Occultation Processing Package | |
| RR | Requirements Review | |
| RTM | Radiative Transfer Model | |
| RTTOV | Radiative Transfer model for TOVS | |
| Rx | Receiver | |
| S |
| S/A | Selective Availability (a mode that the GPS satellites are usually in, which degrades the accuracy of their signal for non-military users) | |
| S/C | Abbreviation for "spacecraft" | |
| SAC-C | Satelite de Aplicaciones Cientificas - C | |
| SAF | Satellite Application Facility (EUMETSAT) | |
| SAG | Science Advisory Group | |
| SAR | Synthetic Aperture Radar | |
| SCI | Science | |
| SCIAMACHY | Scanning Imaging Absorption Spectrometer for Atmospheric Cartography | |
| SD | Single Differencing | |
| SEVIRI | Spinning Enhanced Visible and Infrared Imager | |
| SG | Steering Group | |
| SNR | Signal to Noise Ratio | |
| SP | Science Plan | |
| SRD | System Requirements Document | |
| SRN | System/software Release Note | |
| SSD | Sounding Support Data | |
| SST | Sea-surface temperature | |
| State Vector | A collection of variables that can be uploaded to the satellite to set its state | |
| STG | Scientific and Technical Group (of EUMETSAT) | |
| STRR | System Test Results Review | |
| SVN | Identification number assigned to each GPS satellite | |
| SVTRR | System Validation Test Results Review | |
| T |
| TBA | To Be Added | |
| TBC | To Be Confirmed | |
| TBD | To Be Determined | |
| TIROS | Television and Infrared Observation Satellite | |
| TLA | Three Letter Acronym | |
| TOA | Top of the atmosphere | |
| TOUGH | Targeting Optimal Use of GPS Humidity Measurements in Meteorology | |
| TOVS | TIROS Operational Vertical Sounder | |
| TZD | Tropospheric (Total) Zenith Delay | |
| U |
| U-MARF | Unified Meteorological Archive and Retrieval Facility. Former name of the EUMETSAT Data Centre. | |
| UCAR | University Corporation for Atmospheric Research | |
| UNAVCO | University Navstar Consortium | |
| UR | User requirements | |
| URD | User Requirements Document | |
| UTC | Universal Time Coordinated (in practice the same as Greenwich Mean Time) | |
| V |
| VAR | Variational analysis: 1D, 2D, 3D, or 4D variants (NWP assimilation technique) | |
| VS | Visiting Scientist | |
| VSA | Visiting Scientist Activity | |
| W |
| WBS | Work Breakdown Structure | |
| WMO | World Meteorological Organization | |
| WP | Work Package | |
| WV | Water vapour | |
| Z |
| ZD | Zero Differencing | |
| ZTD | Zenith Tropospheric (Total) Delay | |
