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Glossary

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ABS :

Anti Blocking System
AC :

Address Circular
ACI :

Action Item Clarification
AD :

Applicable Document
AD/R :

Architectural Design Review
ADD :

Architectural Design Document
ADP :

Acceptance Data Package
AES :

Analysis & Evaluation Segment
AFCL :

Air Force Cambridge Research Laboratories
AHRS :

Altitude Heading Reference System
AIR :

Inspection Aircraft & Independent Positioning
AIV :

Assembly, Integration and Verification
AIVP :

Assembly, Integration and Verification Plan
ANSP :

Air Navigation Service Provider
AOC :

Advance Operational Capability
AOR :

Atlantic Ocean Region
AOR-E :

AOR East
AOR-W :

Atlantic Ocean Region-West (INMARSAT III satellite)
AP :

Auto Pilot
APV :

Approach with Vertical Guidance
ARINC :

Aeronautical Radio, INC
ARTEMIS :

Advanced Relay and Technology Mission Satellite
ARTES :

Advanced Research in TElecommunication Systems
ASE :

Agence Spatiale Européenne or European Space Agency (ESA)
ASN.1 :

Abstract Syntax Notation One
ASQF :

Application Specific Qualification Facility
ASQFRD :

ASQF Requirements Document
ATC :

Air Traffic Control
ATM :

Air Traffic Management or Asynchronous Transfer Mode
ATS :

Air Traffic Services
ATSP :

ATS Providers
AWOP :

All Weather Operations Panel
Baro :

Barometric altitude
BER :

Bit Error Rate
BIH :

Bureau International de l’Heure
BIPM :

Bureau International des Poids et Mesures
BITE :

Built In Test Equipment
BPF :

Band Pass Filter
Bps :

Bit per second
BPSK :

Bipolar Phase Shift Key
BRNA :

Berlin RIMS
BSDR :

Baseline System Design Review
BSDR-C :

Consolidated BSDR
BSSC :

Board for Software Standardization & Control
BW :

Band Width
C&M :

Control & Monitoring
C/A :

Coarse Acquisition
C1 :

C-band uplink frequency (C1 = 6.4 GHz)
C2 :

C-band downlink frequency (C2 = 3.6 GHz)
CAA :

Civil Aviation Authority
CAASD :

Centre for Advanced Aviation System Development
CADM :

Configuration And Data Management
CARG :

Compound Annual Rate of Growth
CAT-1 :

Category 1 Precision Approach Phase of Flight
CAT-2 :

Category 2 Precision Approach Phase of Flight
CC :

Configuration Control or Core Computer
CCB :

Change Configuration Board or Configuration Control Board
CCF :

Central Control Facility
CCI :

Communications Control Interface
CCITT :

Comite Consultatif International Telegraphique et Telephonique or International Telephone and Telegraph Consultative Committee
CCN :

Contract Change Notice
CDI :

Course Deviation Indicator
CDMA :

Code Division Multiple Access
CDR :

Critical Design Review
CE :

Communication Equipment
CEU :

Commission of the European Union
CFI :

Customer Furnished Item
CFSP :

Common Foreign and Security Policy
CHA :

Channel of High Accuracy
CI :

Configuration Item
CIDL :

Configuration Items Data List
CIO :

Conventional International Origin
CL :

Client representative
CM :

Compliant Multiple or Configuration Manager or Configuration Management
CMO :

Configuration Management Office
CMP :

Configuration Management Plan
CMT :

Centre de Mission et Traitement (Euridis) or Commissioning and Maintenance Terminal
CN :

Change Notice
CNES :

Centre National d’Etudes Spatiales
CNMS :

Communication Network Management System
CNS :

Communications Navigation & Surveillance
CO :

Change Order
COC :

Certification Of Conformance
COQ :

Certification of Qualification
COS :

Continuity Of Service
COTS :

Commercial Off The Shelf
CPF :

Central Processing Facility
CPU :

Central Processing Unit
CR :

Change Request
CRB :

Change Review Board
CRC :

Cyclic Redundancy Check
CRD :

Comment Response Documents (at EASA)
CSA :

Channel of Standard Accuracy
CSAR :

Configuration Status Accounting Report
CSI :

Containment Surface Incident
CSU :

Channel Service Unit
CW :

Continuous Wave
DAL :

Development Assurance level
DAT :

Digital Audio Tape
DB :

Data Base
DCN :

Document Change Notice
DCU :

Display & Control Unit
DD :

Detailed Design
DD/R :

DD Review
DDD :

DD Document
DDKP :

DD Key Point
DFS :

Deutsche Flugsicherung GmbH (D)
DG AGRI :

Directorate-General for Agriculture and Rural Development
DG DEFIS :

Directorate-General for Defence Industry and Space

 
DGAC :

Direction Generale Aviation Civile (F)
DGPS :

Differential GPS
DH :

Decision Height
DIL :

Deliverable Items List
DJF :

Design Justification File
DLL :

Delay Lock Loop
DLR :

Deutsche forschungsanstalt fur Luft – und Raumfahrt e.v.
DMA :

Direct Memory Access
DME :

Distance Measuring Equipment
DoC :

Depth of Coverage
DOD :

Department Of Defence (US)
DOP :

Dilution Of Precision
DOT :

Department Of Transport
DPU :

Data Processing Unit
DR :

Design Review
DRACAS :

Data Recording Analysis and Corrective Action System
DRAIM :

Differential RAIM
DRD :

Document Requirements Description
DRL :

Documentation Requirements List
DRMS :

Distance Root Mean Square
DRU :

Data Replaceable Unit
DSPU :

Digital Signal Processing Unit
DSS :

Design Simulation Segment
DSU :

Data Service Unit
DVP :

Development Verification Platform
DVPRD :

DVP Requirements Document
EARSC :

European Association of Remote Sensing Companies
EASA :

European Aviation Safety Agency
ECAC :

European Civil Aviation Conference
ECDIS :

Electronic Chart Display and Information System
ECEF :

Earth Centred Earth Fixed
ECO :

Engineering Change Order
ECP :

Engineering Change Proposal
ECR :

Engineering Change Request
ECRB :

External Change Review Board
ECS :

Electronic Chart System
ECSS :

European Co-operation for Space Standardisation
EDAS :

EGNOS Data Access Service
EDP :

EGNOS ILD Documentation Plan
EEE :

Electrical Electronic Electromechanical
EETES :

EGNOS End To End Simulation
EGN :

EGNOS
EGNOS :

European Geostationary Navigation Overlay Service
EIDP :

End Item Data Package
EIRP :

Equivalent Isotropic Radiated Power
EL :

Elevation
EMC :

Electromagnetic Compatibility
EMP :

EGNOS Maintenance Plan
ENAV :

Ente Nationale di Assistenze al Volo (Italy)
ENMA :

EGNOS Network Management Application
ENMC :

EGNOS Network Monitoring & Control
ENT :

EGNOS Network Time
EOIG :

EGNOS Operators and Infrastructure Group
EPO :

EGNOS Project Office
EPROM :

Erasable and Programmable Read Memory Only
EPUE :

EGNOS Prototype User Equipment
EPUERD :

EPUE Requirements Document
ERAM :

EGNOS Requirements Allocation Matrix
ERNP :

European RadioNavigation Plan
ESA :

European Space Agency
ESA HQ :

ESA Headquarters Paris
ESA-CST :

ESA Centre Spatial de Toulouse or ESA Toulouse Space Centre
ESDV :

Early System Demonstration & Verification (activities)
ESM :

Electronics Support Measures
ESNP :

European Satellite Navigation Programme
ESRRD :

EGNOS Standard Receiver Document
ESSF :

EGNOS System Simulation Facility
ESSP :

European Satellite Services Provider
ESTB :

EGNOS System Test Bed
ESTEC :

European Space Research and Technology Centre (Noordwijk)
ESVS :

EGNOS Service Volume Simulator
ETFM :

Early Trials Final Meeting
ETG :

European Tripartite Group
ETMS :

EGNOS Transport Management System
ETS :

Early Test System
ETSO :

European Technical Standard Order
EUMETSAT :

European Organisation for the Exploitation of Meteorological Satellites
EUROCAE :

European Organisation for Civil Aviation Equipment
EuroQCI :

Euro Quantum Communication Infrastructure
EUSPA :

European Union Agency for the Space Programme
EVP :

EGNOS Verification Plan
EWAN :

EGNOS Wide Area Network
EWAN :

EGNOS Wide Area Network
FAA :

Federal Aviation Administration
FAF :

Final Approach Fix
FANS :

Future Air Navigation Systems
FDDI :

Fibber Distributed Data Interface
FDE :

Failure Detection and Exclusion
FDI :

Failure Detection and Isolation
FDIR :

Failure Detection , Isolation and Recovery
FDMA :

Frequency Division Multiple Access
FDS :

Flight Director System
FEC :

Forward Error Correction
FECP :

Front End Communication Processor
FEE :

(EWAN) Front End Equipment
FFT :

Fast Fourier Transform
FIR :

Flight Information Region
FIVP :

Factory Integration Validation Plan
FL :

Flight Level
FMAP :

Failure during Miss Approach Procedure
FMECA :

Failure Mode Effects & Criticality Analysis
FMS :

Flight Management System
FOC :

Full Operational Capability
FOCTF :

FOC Transition File
FQP :

Factory Qualification Plan
FQR :

Factory Qualification Review
FR :

Frame Relay
FTA :

Fault Tree Analysis
FTE :

Flight Technical Error
FTRR :

Factory Test Readiness Review
G-SBAS :

Geostationary-Satellite Based Augmentation Systems
G/S :

Ground Segment
GBA :

Geostationary Broadcast Area
GBAS :

Ground Based Augmentation System
GEO :

Geostationary Earth Orbit
Geo-IoT :

Geolocation - Internet of Things
GIC :

Ground Integrity Channel
GIVD :

Grid Ionospheric Vertical Delay
GIVE :

Grid Ionospheric Vertical Error
GLONASS :

Global'naya Navigatsionnaya Sputnikovaya Sistema or Global Navigation Satellite System
GMDSS :

Global Maritime Distress and Safety System
GNOS :

Geostationary Navigation Overlay Service
GNSS :

Global Navigation Satellite System
GNSS-1 :

GNSS First Generation
GNSS-P :

GNNS Panel
GOVSATCOM :

Governmental Satellite Communications
GPRS :

General Packet Radio Services
GPS :

Global Positioning System
GRAIM :

Ground RAIM
GRS :

Geostationary Ranging Stations or Geostationary Ranging System
GRS-H :

GRS – Hartebeeshoek, South Africa
GRS-K :

GRS – Kourou, Guyana
GRS-S :

GRS – Singapore
GRS-T :

GRS – Toulouse, France
GS :

Ground Speed or Ground Segment
GSA :

European GNSS Agency
GSBAS :

Geostationary Satellite Based Augmentation System
GSCN :

Ground Segment Communication Network
GSM :

Global System for Mobile communications
GSMC :

Galileo Security Monitoring Centre
GSRD :

Ground Segment Requirements Document
GSVP :

Ground Segment Verification Plan
GUI :

Graphical User Interface
GW :

GateWay
Gyro :

Gyroscope
H/W :

Hardware
HAL :

Horizontal Alarm Limit
HDI :

HeaDIng
HDLC :

High Level Data Link Control
HDOP :

Horizontal Dilution Of Precision
HDU :

Hard Disk Unit
HE :

Hosting Entity
HID :

Hazardous Invalid Data
HMI :

Hazardous Misleading Information
HOW :

Hand Over Word
HPA :

High Power Amplifier
HPL :

High Precision Landing or Horizontal Protection Level
HUNE :

Horizontal User Navigation Error
HW :

HardWare
HWE :

Hardware Engineer
I/F :

InterFace
I/S :

Interference / Signal
IALA :

International Association of Lighthouse Authorities
IAP :

Interoperability Action Plan
IATA :

International Air Transport Association
ICAO :

International Civil Aviation Organisation
ICB :

Interface Control Board
ICD :

Interface Control Document
ICO :

Intermediate Circular Orbit
ICRB :

Interna Change Review Board
IDEF0 :

Integrated Design Functional model
IERS :

International Earth Rotation Service
IF :

Intermediate Frequency
IFF :

Identifier Friend (or Foe)
IGP :

Ionospheric Grid Points
IGS :

International GPS Service for Geodynalics
IKD :

In Kind Delivery
ILS :

Instrument Landing System or Integrated Logistics Support
IMO :

International Maritime Organisation
INC :

Inmarsat Navigation Center
INMARSAT :

International MARitime SATellite
INS :

Inertial Navigation System
IOC :

Initial Operational Capability
IOD :

Issue Of Data or Issuance Of Data
IODC :

Issuance Of Data Clock
IODE :

Issuance Of Data Ephemeris
IODI :

Issuance Of Data Ionosphere
IODP :

Issuance Of Data PRN
IOP :

Initial Operations Phase
IOR :

INMARSAT III – Indian Ocean Region
IoT :

Internet of Things
IP :

Internet Protocol
IPP :

Ionospheric Pierce Point
IRD :

Interface Requirements Document
IRS :

Inertial Reference System
ISDN :

Integrated Services Digital Network
ISNS :

International Satellite Navigation System
ISO :

International Organization for Standardization
ISOP :

In Service Operations Phase
ISVV :

Independent Software Verification and Validation
ITRF :

International Terrestrial Reference Frame
ITT :

Invitation To Tender
ITU :

International Time Unit
JAA :

Joint Aviation Authorities
JAR :

Joint Airworthiness Requirement
JCB :

Joint Communications Board (ESA)
JTC :

Joint Tripartite Committee
JTSO :

Joint Technical Standing Orders
Kbps :

Kilobits per second
KO :

Kick-Off
KOM :

KO Meeting
L1 :

L1-GPS frequency (L1 = 1575,42 MHz)
L2 :

L2-GPS frequency (L1 = 1227,2 MHz)
LAAS :

Local Area Augmentation System
LAD :

Local Area Differential
LADGPS :

Local Area Differential GPS
LAN :

Local Area Network
LAPB :

Link Access Procedure for Balanced circuits
LBS :

Location-based services
LHC :

Left Hand Circular
LHCP :

Left Hand Circular Position
LMP :

Logistic Management Plan
LNA :

Low Noise Amplifier
LO :

Local Oscillator
LOC :

Line Of Code
LPV :

Localiser Performance with Vertical Guidance
LPWAN :

Low-Power Wide-Area Network
LRU :

Line Replaceable Unit
LSA :

Logistic Support Analysis
LSB :

Least Significant Bit
M&C :

Monitoring and Control
M-CCB :

Mission Configuration Control Board
MASPS :

Minimum Aviation System Performance Standard
MCC :

Mission Control Centre
MCC :

Mission Control Centres
MCC-P :

Master Control Centre (Primary)
MCC-S :

Master Control Centre (Secondary)
MCC1 :

Principal Master Control Centre
MCC2 :

Backup Master Control Centre
MCCRD :

MCC Requirements Document
MCU :

Management & Control Unit
MD :

Miss Detection
ME :

Multipath Error
MEDLL :

Multipath Estimating Delay Lock Loop
MEL :

Minimum Equipment List
MEOSAR :

Medium Earth Orbit Search and Rescue system
MLS :

Microwave Landing System
MMEL :

Master MEL
MMI :

Man Machine Interface
MOPS :

Minimum Operational Performance Standard
MPR :

Mission Performance Requirements
MRB :

Material Review Board
MRD :

Mission Requirements Document
MRR :

Mission Requirements Review
MSAS :

Multi-transport Satellite-based Augmentation System
MSB :

Most Significant Bit
MSER :

Manager for in-SERvice phase
MSG3 :

Maintenance Steering Group 3
MTB :

Mediterranean Test Bed
MTBF :

Mean Time Between Failures
MTBO :

Mean Time Between Outages
MTSAT :

Multi Transport SATellite
MTTR :

Mean Time To Restore an outage
NA or N/A :

Note Applicable
NAS :

National Airspace System or National Air Space
NATS :

National Air Traffic Services (UK)
NAV :

NAVigation sub-system
NC :

Non Compliant
NCC :

Network Control Centre
NCM :

Network Control Management
NCR :

Non-Conformance Report
NCRB :

Non-conformance Review Board
NI :

Non Integrity
NIHID :

Non-Integrity Hazardous Invalid Data
NLES :

Navigation Land Earth Station
NLES-1B :

Backup to NLES-R
NLES-2B :

Backup to NLES-A
NLES-A :

NLES – Aussagel France
NLES-R :

NLES – Riesting Germany
NLESRD :

NLES Requirements Document
NM :

Nautical Mile
NMC :

Network Management Center
NMF :

Network Management Facility
NOC :

Network Operations Centre
NOCC :

Network Operation Control Centre
NOTAM :

Notice To Airmen
NPA :

Non Precision Approach
NPL :

National Physical Laboratory
NSA :

Navigation Service Availability
NSE :

Navigation System Error
NSV :

Number of Satellite Vehicles
NTW :

Network
NTWRD :

Network Requirements Document
O&M :

Operation & Maintenance
O/S :

Operating System
OCR :

Operational & Certification Requirement
OD :

Orbit Designation
OHA :

Operating Hazard Analysis
ORD :

Operations Requirements Document
ORR :

Operational Readiness Review
OS :

Open Service

OS :

Open Service
OS-NMA :

Open Service Navigation Message Authentication service
OSI :

Open Systems Interconnection
P&C :

Processing and Control
P-CCB :

Programme Configuration Control Board
PA :

Product Assurance
PA :

Product Assurance
PACF :

Performance Assessment and Check-out Platform
PACFRD :

PACF Requirements Document
PAD :

Packet Assembler-Disassembler
PAE :

PA Engineer
PAM :

PA Manager
PAP :

Product Assurance Plan
PB-NAV :

Programme Board-Navigation (ESA)
PBMF :

Performance Budget Management File
PBN :

Performance Based Navigation
PC :

Personal Computer
PDOP :

Position Dilution Of Precision
PDP :

Project Development Plan
PDR :

Preliminary Design Review
PFA :

Probability of False Alarm
PFD :

Power Flux Density
PHD :

Project History Document
PHST :

Packing, Handling, Storage & Transport Plan
PIDS :

Prime Item Development Specification
PM :

Progress Meeting or Preventive Maintenance or Project Management
PMD :

Probability of Missed Detection
PMP :

Project Management Plan
PN :

Pseudo Noise
POR :

Pacific Ocean Region
PP :

Present Position
PPP :

Precise Point Positioning
PPS :

Precise Positioning Service or Pulse Per Second
PRE :

Pseudo-Range Error
PRN :

Pseudo Random Noise
PRS :

Public Regulated Service
PS :

Power Supply
PS-CCB :

Project/System Configuration Control Board
PSC :

Project Safety Concern
PSPDN :

Packet-Switched Public Data Network
PSS :

Procedures, Standards and Specifications
PSTN :

Public Switched Telephone Network
PT :

Product Tree
PTT :

Project Tracking Team
PU :

Portable Unit
PVC :

Permanent Virtual Circuit
PVM :

Procedure Verification Matrix
PVT :

Position, Velocity, Time
QA :

Quality Assurance
QFE :

Barometric pressure at runway threshold
QMS :

Quality Management System
QoS :

Quality of Service
QR :

Qualification Review
R-GEO :

Ranging via GEO satellites
RAAS :

Regional Area Augmentation System
RAIM :

Receiver Autonomous Integrity Monitoring
RAM :

Reliability Availability and Maintainability or Random Access Memory
RAMS :

Reliability Availability, Maintainability and Safety
RB :

Review Board
RCF :

Ranging Control Facility
RCS :

Revision Control System
RCVR :

Receiver
RD :

Requirements Document or Reference Document
REC :

Range Error Correction
RF :

Radio Frequency
RFC :

RF Conversion or Request For Change
RFD :

Request For Deviation
RFDC :

RF Down Converter
RFE :

RF front End
RFI :

Radio Frequency Interference
RFLAB :

RF measurement LABoratory
RFQ :

Request For Quotation
RFW :

Request For Waiver
RGIC :

Ranging and Ground Integrity Channel
RGS :

Ranging Ground Segment
RHC :

Right Hand Circularly polarised
RHCP :

Right Hand Circular Polarisation
RID :

Review Item Discrepancy
RIMS :

Ranging and Integrity Monitoring Station
RIMSRD :

RIMS Requirements Document
RMS :

Root Mean Square
RNAV :

Radio NAVigation
RNP :

Required Navigation Performance or Required Navigation Parameters
ROD :

Review Of Design
ROR :

Range Only Radar
RPU :

Receiver Processing Unit
RRC :

Range-Rate Corrections
RS :

Remote Station or Reference Station
RST :

Reference System Time
RTCA :

Radio Technical Commission for Aeronautics or Radio Technical Committee of America
RTCM :

Radio Technical Commission for Maritime Services
RTK :

Real Time Kinematics
RTOS :

Real Time Operating System
RTSS :

Real-Time Simulation Segment
RUE :

RESTREINT UE/EU RESTRICTED: the unauthorised disclosure of this information could be disadvantageous to the interests of the EU or one or more of the Member States.
RX :

Receiver
S/C :

SpaceCraft
S/W :

SoftWare
SA :

Selective Availability
SADT :

Structure Analysis and Design Technical
SAN :

Satellite Access Node
SARP(s) :

Standards And Recommended Practices
SAW :

Surface Acoustic Wave
SBAS :

Satellite Based Augmentation System
SC :

Software Component
SCAR :

Software Component Acceptance Review
SCAT-I :

Special CATegory I
SCC :

Satellite Control Centre
SCL :

Station de Connexion et Localisation
SCM :

Software Configuration Management
SCMP :

Software Configuration Management Plan
SCO :

Software Change Order
SCQR/R :

Software Component Qualification Readiness Review
SCR :

Software Change Request
SCSI :

Small Computer System Interface
SDCM :

System for Differential Corrections and Monitoring
SDD :

Service Definition Document

SDD :

Service Definition Document
SDM :

System Definition Manual
SE :

EGNOS Subsystem Element
SECT :

System Engineering Core Team
SeKO :

Set Kick Off
SEP :

Support Equipment Plan
SESAR :

Single European Sky ATM Research
SFVP :

Support Facility Verification Plan
SGS :

Soviet Geocentric System
SGS-90 :

Soviet Geodetic System
SIS :

Signal In Space
SIS :

Signal-in-Space
SIVP :

Site Integration Validation Plan
SL :

Service Level or Station de Localisation
SL0 :

Service Level 0
SL1 :

Service Level 1
SLA :

Service Level Agreement (with network service provider)
SLRD :

System Level Requirements Document or SL Requirements Document
SMR :

Software Modification Report
SNA :

Satellite Navigation Application
SNAPAS :

Satellite Navigation Performance Analysis Software
SNMP :

Simple Network Management Protocol
SNR :

Signal to Noise Ratio
SNT :

Satellite Navigation Transponder
SOC :

Spacecraft Operation Centre
SoL :

Safety of Life
SoL :

Safety of Life
SOLAS :

Safety of Life At Sea
SOP :

System Operation Plan
SOW :

Statement Of Work
SPACS :

Simplified Position Accuracy Calculation Software
SPM :

System Project Management
SPMP :

System Project Management Plan or Software Project Management Plan
SPR :

Software Problem Report
SPS :

Standard Positioning Service
SQAP :

Software Quality Assurance Plan
SQL :

Software Query Language
SQP :

System Qualification Plan
SQR :

System Qualification Review
SR :

Standard Receiver or Software Requirements
SR/R :

Software Requirements Review
SRAM :

Static Random Access Memory
SRB :

Software Review Board
SRD :

System Requirements Document or Software Requirement Document
SRN :

Software Release Note
SSA :

Space Situational Awareness
SSAR :

Sub System Acceptance Review
SSATR :

Sub System Acceptance Test Review
SSCDR :

Sub System CDR
SSDD :

System Segment Design Document
SSFQR :

Sub System Factory Qualification Review
SSKO :

Sub System Kick Off
SSN :

Sun Spot Number
SSPA :

Solid State Power Amplifier
SSPDR :

Sub System PDR
SSR :

Site Selection Review
SSRD :

Sub-System Requirements Document
SST :

Space Surveillance and Tracking 
SSTRR :

Sub System Test Readiness Review
ST :

System Testing
STD :

Software Transfer Document
STEP1 :

R-GEO augmentation
STEP2 :

GIC augmentation
STEP3 :

WAD augmentation
STNA :

Service Technique Navigation Aerienne (F)
STR :

System Test Readiness
STRR :

System Test Readiness Review
SU :

SUpplier
SUE :

SECRET UE/EU SECRET: the unauthorised disclosure of this information could seriously harm the essential interests of the EU or one or more of the Member States.
SUM :

Software User Manual
SV :

Space Vehicle
SVC :

Switch Virtual Circuit
SVP :

System Verification Plan or Software Verification Plan or Subsystem Verification Plan
SVs :

Space Vehicles
SVVP :

Software Verification and Validation Plan
SW :

SoftWare
SWPM :

SoftWare Project Manager
SWRU :

Software Replaceable Units
T :

Test or Time
T4S :

Thomson-CSF / Services et Systemes Sol Spatiaux
TA :

Terminal Adapter (ISDN modem)
TAS :

True Air Speed
TBC :

To Be Clarified or To Be Confirmed
TBD :

To Be Defined or To Be Determined
TBO :

Time Between Outages
TBS :

To Be Studied or To Be Specified by the contractor
TCP :

Transmission Control Protocol
TCP/IP :

Transmission Control Protocol/Internet Protocol
TE :

Test Engineer
TEB :

Tender Evaluation Board
TEC :

Total Electron Content
TF :

Task Force
TGNSS :

NLES reference Time
TH :

True Heading
TL :

Team Leader
TLM :

TeLeMetry
TLS :

Target Level of Safety
TM :

TeleMetry
TMA :

Technique Management Area
TN :

Technical Note
TN-033 :

Technical Note on EGNOS overlay services
TN-069 :

Operation Concept Document
TOW :

Time Of Week
TPG :

Time of Propagation
TRAC :

Traceability Report
TRB :

Test Review Board
TRO :

Time to Restore an Outage
TRR :

Test Readiness Review
TRSF :

Transfer
TS :

Training Segment
TSE :

Total System Error = ( NSE2 + FTE2)1/2
TSF :

Test and Simulation Facilities
TSO :

Technical Standard Order
TTC :

Telemetry, Tracking and Command
TTFF :

Time to first fix
TUE :

Test User Equipment
TWAN :

Transport Wide Area Network
Tx :

Transmitter
UAV :

Unmanned Aerial Vehicle
UAVs :

Unmanned Aerial Vehicles
UDP :

User Datagram Protocol
UDRE :

User Differential Range Error
UEE :

User Equipment Error
UERE :

User Equivalent Range Error
UHF :

Ultra High Frequency
UIVD :

User Ionospheric Vertical Delay
UIVE :

User Ionospheric Vertical Error
UNE :

User Navigation Error
UPS :

Uninterruptible Power Supply
UR :

User Requirements
UR/R :

User Requirements Review
URA :

User Range Accuracy
URD :

User Requirements Document
URE :

User Range Error
US :

United States
USAT :

Ultra-Small Aperture Terminal (satellites terminal)
USRD :

User Segment Requirements Document
UTC :

Coordinated Universal Time
UWB :

Ultra-wideband
VAL :

Vertical Alarm Limit
VCB :

Verification Control Board
VDOP :

Vertical Dilution Of Precision
VFR :

Visual Flight Rules
VFRs :

Visual Flight Rules
VHF :

Very High Frequency
VHTS :

Very High Throughput Satellite
VMS :

Vessel Monitoring System
VNSE :

Vertical Navigation System Error
VOR :

VHF Omnidirectional Ranging
VPE :

Vertical Position Error
VPL :

Vertical Protection Level
VRD :

Verification Requirements Document
VRT :

Variable Rate Technologies
VSAT :

Very Small Aperture Terminal
VTE :

Vertical Tropospheric compensation Error
VTS :

Vessel Traffic Surveillance
VUNE :

Vertical User Navigation Error
WAAS :

Wide Area Augmentation System
WAC :

Wide Area Correction
WAD :

Wide Area Differential
WADC :

Wide Area Differential Correction
WADGPS :

Wide Area Differential GPS
WBS :

Work Breakdown Structure
WD :

Wind Direction
WGS :

World Geodesic System
WGS-84 :

World Geodetic System
WIMP :

Windows Icons Mouse Pointer
WN :

Week Number
WP :

WorkPackage
WPD :

WorkPackage Description
WS :

Wind Speed
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