List of Abbreviations

This is a list of the most common abbreviations used on the ROM SAF webpage.

Numeric | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | Z |

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