GNSS Glossary

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

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

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)

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

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 System

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

EUROCAE :

European Organisation for Civil Aviation Equipment

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 or INMARSAT Geostationary satellite

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

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

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

OSI :

Open Systems Interconnection

P&C :

Processing and Control

P-CCB :

Programme Configuration Control Board

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

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

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

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

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

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

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

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