DICTIONARY

(OR)

Off Route. According to the provisions 1.34 and 1.37 of Radio Regulations, (OR) means an aeronautical mobile service or aeronautical mobile-satellite service intended for communications, including those relating to flight coordination, primarily outside national or international civil air routes.

(R)

Route. According to provisions 1.33 and 1.36 of the Radio Regulations (R) means an aeronautical mobile service or aeronautical mobile-satellite service reserved for communications relating to safety and regularity of flight, primarily along national or international civil air routes.

3GPP

The 3rd Generation Partnership Project

4G

The 4th generation of the mobile communication IMT

5G

The 5th generation of the mobile communication

A/D

Analog-to-Digital

AARS

Automated Aircraft Reporting System

AAS

(1) Adaptive Antenna System
(2) Advanced Antenna System

Ac-nodeB

Aircraft Node B - radio interface onboard

ACARS

Aircraft Communications Addressing and Reporting System

ACC

Area Control Centre

ACC/L

Area Control Centre/Lower

ACC/U

Area Control Centre/Upper

ACK

Acknowledge

ACP

Aeronautical Communication Panel

ACS

Automatic Connection System GMDSS

ADC

Analog-to-Digital Converter

ADEOS

Advanced Earth Observation Satellite

ADP

Automatic Data Processing

ADPE

Automatic Data Processing Equipment

ADR

Astra Digital Radio

ADS

Automatic Dependant Surveillance (Aeronautical)

ADS-B

Automatic Dependent Surveillance-Broadcast (ADS-B): Aircraft transmitters operating within aeronautical mobile-satellite (R) service. Transmission of aircraft identification and position. (Note: Resolution 425 (WRC-15)).

AES

Aircraft Earth Station

AFA

Adaptive Frequency Agility

AFC

Automatic Frequency Control

AFOS

Automatic Forecasting and Observing System

AGA

Air Ground Air

AGC

Automatic Gain Control

AI

Agenda Item of WRC

AIC

Air Information Circullars

AIS

Automatic Identification System

AIS-SART

Automatic Identification System - Search And Rescue Transmitter

AL

Aeronautical Radionavigation Land Station

ALC

Automatic Level Control

ALD

Assistive Listening Devices

ALMA

Atacama Large Millimetre/Submillimetre Array

ALS

Airborne Landing System/Aircraft Landing System

AM

(1) Aeronautical Radionavigation Mobile Station
(2) Amplitude Modulation

AM(R)S

Aeronautical Mobile (R) Service

AMC

Asymmetrical Modulation and Coding Scheme

AMDAR

Aircraft Meteorological Data Relay

AMS

Aeronautical Mobile Service

AMS(OR)S

Aeronautical Mobile - Satellite (Off-Route) Service

AMS(R)S

Aeronautical Mobile - Satellite (Route) Service

AMSS

Aeronautical Mobile Satellite Service

AMT

Aeronautical Mobile Telemetry

ANSI

American National Standards Institute

ANSP

Air Navigation Service Provider

AOC

1) Aerodome Obstacle Chart
2) Aeronautical Operational Control

AOM

Acoustic beacons for orientation (Czech abbreviation)

API

Advance Publication Information

APP, App.

APP = Appendix of the ITU Radio Regulations, App. = Approach Control

APT

Asia-Pacific Telecommunity

APV

Approach and Landing Operations with Vertical Guidance

ARDF

Amateur Radio Direction Finding

ARNS

Aeronautical Radionavigation Service

ARNSS

Aeronautical Radionavigation-Satellite Service

ARPU

Average Revenue Per User

ARS

Amateur Service

ARSS

Amateur-Satellite Service

AS

Amateur-Satellite Service

ASA/LSA

See LSA/ASA

ASCII

American Standard Code for Information Interchange

ASDE

Airport Surface Detection Equipment

ASFCG

Aeronautical Spectrum Frequency Consultation Group

ASM

Applications Specific Messages

ASMG

Arab Spectrum Management Group

ASMI

Airfield Surface Movement Indicator

ASS

Amateur-Satellite Service

ATC

Air Trafic Control

ATIS

(1) Automatic Terminal Information Service
(2) Automatic Transmitter Identification System

ATM

(1) Air Traffic Management
(2) Asynchronous Transfer Mode

AtoN

Aid to Navigation [Rec. ITU-R M.1371-3]

ATPC

Automatic Transmitter Power Control

ATS

Air Traffic Services

ATSC

Advanced Television Systems Committee

ATU

African Telecommunicatios Union

AVI

Automatic Vehicle Identification [ECA]

AWR

Airborne Weather Radar

B-RNAV

Basic Area Navigation

BAS

Broadcasting Auxiliary Service

BBDR

Broad Band Disaster Relief

BC

Broadcasting station, sound

BEM

Block Edge Mask [ECC Rep 131]

BFWA

Broadband Fixed Wireless Access [ECA]

BIPM

International Bureau of Weights and Measures

Blok, frequency block

Continuous range of frequencies defined by lower and upper frequencies, for the procedure of limiting the number of rights to use radio spectrum, based on technology requirements and/or in accordance with the international agreements and harmonisation.

BLOS

Beyond Line-Of-Sight

BMA

Building Material Analysis

BPL

Broadband over Powerline

BPS, bit/s

Bits per Second

BPSK

Binary Phase-Shift Keying

BR

Bureau des radiocommunications UIT-R

BS

(1) Broadcasting Service
(2) Base Station

BSS

Broadcasting-Satellite Service

BT

Broadcasting station, television

BTS

Base Transceiver Station

BWA

Broadband Wireless Access

C/C

Command and Control

C2

Command and Control

CAP

Common Alerting Protocol

CB

Citizen Band (27 MHz)

CBISS

Communication Committee Broadcasting Issues Subgroup

CCA

Clear channel assessment. CCA is a mechanism in which multiple technologies using unlicensed spectrum can coexist. It includes Carrier sensing and energy detection. In Carrier sensing, you measure received signal strength of valid 802.11 symbol. The thresholds for both carrier sense and energy detection are predefined in the standard. For 802.11a the carrier sensitivity is ­82 dBm and the energy detection threshold is ­62 dBm. If no signal is sensed based on ED threshold, then go ahead with a transmission right away.

CCIR

International Radio Consultative Committee (ITU); french: Comité consultatif international pour la radio. In 1992, the CCIR became the ITU-R.

CCITT

International Telegraph and Telephone Consultative Committee (ITU). Renamed ITU-T in 1993.

CDMA

Code Division Multiple Access

CEPT

European Conference of Postal and Telecommunications Administration

CERP

Comitée Européen de Réglementation Postale

CGC, CGCs

Complementary Ground Components

CHB

Channel Bandwith

CHS

Channel Spacing

CIRAF

International High Frequency Broadcasting Conference

CIRM

International Maritime Radio Association

CISPR

Special International Committee on Radio Interference

CITEL

Conferencia Interamericana des Telecomunicaciones

CNPC

control and non-payload communication

CNS/ATM

Communication, Navigation, Surveillance/Air Trafic Managment

CoA

Course of Action

COCOM

Electronic Communication Comittee

CPC

Cognitive Pilot Channel

CPG

Conference Preparatory Group

CPM

Conference Preparatory Meeting

CRAF

Committee on Radio Astronomy Frequencies

CRS

1) Central Radio Station
2) Cognitive Radio System

CS

(1) Central Station
(2) Carrier Sense
(3) Control Station
(4) ITU Constitution

CSAT

Carrier Sensing Adaptive Transmission

CSTDMA

Carrier Sense Time Division Multiple Access

CT

Cordless Telephone

ČTÚ

Czech Telecommunication Office

CUS

Collective Use of Spectrum

CV

ITU Convention

CW

Continuous Wave

D-GPS

Differential Global Positioning System

D/A

Digital-to-Analog

DA2GC

Direct-Air-to-Ground Communications

DAA

Detect And Avoid

DAB

Digital Audio Broadcasting

DAB-IP

Digital Audio Broadcasting - Internet Protocol

DB

Direct Broadcast (dB = decibel)

DCS

(1) Digital Communication System
(2) Data collection System

DEC

Decision

DECT

Digital Enhanced Cordless Telecommunication

DFS

Dynamic Frequency Selection

DGNSS

Differential Global Navigation Satellite System

DGPS

See D-GPS

DHM

Digital voice beacons (Czech abbreviation)

DL

Downlink

DLR

Deutsche Zentrum fur Lüft- und Raumfahrt

DLS

Data Link Service

DMB

Digital Multimedia Broadcasting

DME

Distance Measuring Equipment

DMO

Direct Mode Operation

DRM

Digital Radio Mondial

DS-CDMA

Direct Spread Code Division Multiple Access

DSB

Double Side Band

DSC

Digital Selective Calling

DSI

Detailed Spectrum Investigation

DSL

Digital Subscriber Line

DSO

Digital Switchover

DSR

Digital Satellite Radio

DSRC

Dedicated Short-Range Communication

DSSS

Direct Sequence Spread Spectrum

DTE

Data Terminal Equipment

DTH

Direct-to-Home

DTT

Digital Terrestrial Television

DVB-H

Digital Video Broadcasting-Handheld

DVB-SH

Digital Video Broadcasting Satellite services to Handheld devices (SH) below 3 GHz [ETSI BROADCAS TS 102 585 V1.1.1]

DVB-T

Digital Video Broadcasting-Terrestrial

E-GSM

Extended-GSM

E/s

Earth-to-space direction

EACP

European Aeronautical Common Position

EAS

Electronic Article Surveillance

EBU

European Brodcasting Union

EC

European Commission

ECA

European Common Allocation Table.

ECC

Electronic Communications Committee of the CEPT

eCCA

extended Clear Channel Assessment. If a channel is busy (see CCA), then wait for it to become clear. Once it is clear, wait for a random number of additional CCAs indicating that the channel has remained clear before starting transmission.

ECP

European Common Proposal

ECS

Electronic Communications Services

ECTRA

European Committee for Regulatory Telecommunications Affairs

EES

Earth Exploration Satellite

EESS

Earth Exploration-Satellite Service

EFIS

ECO (European) Frequency Information System

EFP

Electronic Field Production

EFTA

European Free Trade Association

EGNOS

European Geostationary Navigation Overlay Service

EHF

Extra High Frequency

EHRI

Extremely High Resolution Imagery

EIRP

Equivalent Isotropically Radiated Power

ELBA

Emergency Location Beacon-Aircraft

ELT

Emergency Locator Transmitter

EMC

Electromagnetic Compatability

EMI

Electromagnetic Interference

ENG/OB

Electronic News Gathering/Outside Broadcasting

ENVISAT

Environmental Satellite

EOS

Earth Observation Satellites

EPFD

Equivalent Power Flux Density

EPG

Electronic Programme Guide

EPIRB

Emergency Position Indicating Radio Beacon

ERC

European Radiocommunications Committee

ERMES

European Radio Messaging System

ERMTS

European Rail Traffic Management System

ERO

European Radiocommunications Office

ERP

Efective Radiated Power

ESA

European Space Agency

ESIM

Earth Stations In Motion

ESOA

EMEA Satellite Operators Association

ESOMP

The Earth Stations On Mobile Platforms.

ESV

Earth Stations on-board Vessels

ETNO

European Telecommunications Network Operators Association

ETO

European Telecommunications Office

ETSI

European Telecommunications Standard Institute

EU

(1) European Union
(2) EUropean footnote

EUMETSAT

European Organization for the Exploitation of Meteorological Satellites

EUROCAE

European Organization for Civil Aviation Equipment

EUTELSAT

European Telecommunications Satellite Organisation

EVA

Extra Vehicular Activity

FA

Aeronautical station

FATDMA

Fixed Access Time Division Multiple Access

FB

Base station

FC

Coast station

FCC

Federal Communications Commission

FD

Aeronautical Station in the Aeronautical Mobile (R) Service

FDD

Frequency Division Duplex

FDM

Frequency Division Multiplexing

FEC

Forward Error Correction

FG

Aeronautical station in the aeronautical mobile (OR) service

FHSS

Frequency Hopping Spread Spectrum

FIC

Fast Information Channel

FIFO

First-in, first-out

FL

Land station

FM

Frequency Modulation

FP

Port station

FPLMTS

Future Public Land Mobile Telecommunications System

FRMCS

Future Railway Mobile Communications System

FS

Fixed Service

FSO

Free Space Optical Communications

FSS

Fixed-Satellite Service

FTP

File Transfer Protocol

FWA

Fixed Wireless Access

FWS

Fixed Wireless System

FX

Fixed station

GADSS

Global Aeronautical Distress and Safety System

GBAS

Ground Based Augmentation System

GBSAR

Ground Based Synthetic Aperture Radar

GEO

Geostationary Earth Orbit

GLONASS

Global Orbiting Navigation Satellite System

GMDSS

Global Maritime Distress and Safety System

GMS

Geostationary Meteorological Satellite

GMSK

Gaussian Minimum-Shift Keying

GMT

Greenwich Mean Time

GNSS

Global Navigation Satellite System

GOC

General Operator's Certificate

GOES

Geostationary Operational Environmental Satellite

GOMS

Geostationary Operational Meteorological Satellite

GP

Glide Path

GPR

Ground-Probing Radar

GPRS

General Packet Radio Service

GPS

Global Positioning System

GSM

Global System for Mobile Communications

GSM-R

GSM-Railway

GSMA

GSM Association

GSMOBV

GSM on Board Vessels

GSO

Geostationary Satellite Orbit

HAPS

High Altitude Platform Station

HbbTV

Hybrid Broadcast Broadband TV

HCM

HCM Agreement – Agreement between the Administrations of Austria, Belgium, the Czech Republic, Germany, France, Hungary, the Netherlands, Croatia, Italy, Liechtenstein, Lithuania, Luxembourg, Poland, Romania, the Slovak Republic, Slovenia and Switzerland on the co-ordination of frequencies between 29.7 MHz and 43,5 GHz for the fixed service and the land mobile service.

HDFS

High Density Fixed Service

HDFSS

High Density Fixed Satellite Service

HDTV

High Definition TV

HEO

Highly Eliptical Orbit

HEST

High e.i.r.p. Satellite Terminals

HF

High Frequency

HFBC

High Frequency BroadCasting

HFCC

High Frequency Coordination Conference

HIBS

High-altitude platform stations as IMT base stations

HIO

Highly Inclined Orbits

HIPERLAN

High Performance Radio Local Area Networks

HRS

Trunk networks

HS

Handportable Station

HSDPA

High-Speed Downlink Packet Access

HSPA

High Speed Packet Access

HSUPA

High-Speed Uplink Packet Access

Htx

Transmitter Height

IALA

International Association of Lighthouse Authorities

IARU

International Amateur Radio Union

IATA

International Air Transport Association

ICAO

International Civil Aviation Organisation

ICT

Information and Communication Technologies

IDWM

ITU Digitized World Map

IEC

International Electrotechnical Commission

IEEE

Institute of Electrical and Electronics Engineers

IFF

Identification Friend or Foe

IFIC

International Frequency Information Circular

IFL

International Frequency List

IHO

International Hydrographic Organization

ILS

Instrument Landing System

ILS-GP

Instrument Landing System – Glide Path

IMO

International Maritime Organisation

IMSO

International Mobile Satellite Organisation

IMT

International Mobile Telecommunications. See ITU Res. 56-1. IMT encompasses IMT-2000, IMT-Advanced and IMT-2020.

IMT-2000

International Mobile Telecommunications-2000

IMT-2020

5th generation of IMT. The term “IMT-2020” is applied to those systems, system components and related aspects that include new radio interface(s) which support the new capabilities of systems beyond IMT-2000 and IMT-Advanced (ITU Res. 56-2).

IMT-Advanced

International Mobile Telecommunications-Advanced

INMARSAT

International Maritime Satellite Organisation

INTELSAT

International Telecommunication Satellite Organisation

Intersputnik

International Organisation of Space Communication

IoT

Internet of Things.

IP

Internet Protocol

IPR

Intellectual Property Rights

IRT-2000

Integrated Rural Telephony

ISM

Industrial, Scientific and Medical Applications

ISO

International Organization for Standardization

ISP

Internet Service Provider

ISS

(1) Inter-Satellite Service
(2) International Space Station

ITS

Intelligent Transport Systems

ITSO

International Telecommunication Satellite Organisation

ITU

International Telecommunication Union

ITU-D

International Telecommunication Union - Development

ITU-R

International Telecommunication Union - Radiocommunication

ITU-T

International Telecommunication Union - Telecommunication

JTG

Joint Task Group

JTIDS

Joint Tactical Information and Distribution System

KBPS, kbit/s

Kilobits per Second

Klíčovací poměr

A duty cycle is the percentage of one period in which a signal or system is active.

KSC

Kennedy Space Center

LAN

Local Area Network

LBT

Listen Before Talk

LDC

Low Duty Cycle

LEO

Low Earth Orbit

LEOP

Launch and Early Operations Phase

LEST

Low E.i.r.p. Satellite Terminals

LF

Low Frequency

LIDAR

Light Detection and Ranging

LLZ

Localizer

LMS

Land Mobile Service

LMSS

Land Mobile-Satellite Service

LOS

Line of Sight

LP-AMI

Low Power-Active Medical Implant

LPD

Low Power Device

LPR

Level Probing Radar

LR

Radiolocation Land Station

LRIT

Long-Range Identification and Tracking

LSA/ASA

Licensed/Authorised Shared Access

LSDI

Large Screen Digital Imagery

LT2

Location Tracking Applications Type 2

LTE

Long Term Evolution of the 3GPP radio technology

LTE-A

LTE Advanced

M2M

Machine-to-Machine. Non-personal communication, part of the Internet of Things (IoT).

MA

Aircraft Station

MARS

Maritime Mobile Access and Retrieval System

MB/s

Megabytes per second

MBANS

Medical Body Area Network Systems

Mbit/s

Megabits per second

MCA

Mobile Communication on board Aircraft

MCV

Mobile Communication on board Vessel

MediaFLO

Terrestrial Mobile Multimedia Multicast-Forward Link Only

MEO

Medium Earth Orbit

MES

Mobile Earth Station

MetAids

Meteorological Aids Service

MetSat

Meteorological-Satellite Service

MF

Medium Frequency

MFCN

Mobile/Fixed Communications Networks

MFN

Multi Frequency Network

MGWS

Multiple Gigabit Wireless Systems

MHP

Multimedia Home Platform

MID

Maritime Identification Digits

MIDS

Multifunctional Information Distribution System

MIFR

Master International Frequency Register

ML

Land mobile station
Mobile Link (Mobile station transmits)

MLM

Multilateral Meeting

MLS

Microwave Landing System

MMDS

Microwave Multipoint Distribution System

MMS

Maritime Mobile Service

MMSI

Maritime Mobile Service Identity

MMSS

Maritime Mobile-Satellite Service

MO

Mobile station

MOB

Man over Board

MoU

Memorandum of Understanding

MP

Point-to-Multipoint

MPEG

Moving Pictures Experts Group

MPR

Multipurpose Radar

MR

Radiolocation Mobile Station

MRNS

Maritime Radionavigation Service

MRNSS

Maritime Radionavigation-Satellite Service

MRVA

Minimum Radar Vectoring Altitude

MS

1) Mobile Service
2) Member States
3) Ship station

MSA

Minimum Sector Altitude

MSI

Maritime Safety Information

MSK

Minimum-shift keing

MSS

1) Mobile Satellite Service
2) Mobile Satellite Services

MUF

Maximum Usable Frequency

MVDS

Multipoint Video Distribution Service

MWA

Mobile Wireless Access

MWARA

Major World Air Route Area

MWS

Multimedia Wireless System

NASA

National Aeronautics and Space Administration

NATO

North Atlantic Treaty Organisation

NAVDAT

Navigation Data

NAVTEX

1) Navigational Text Messages
2) Narrow-band direct-printing telegraphy system for transmission of navigational and meteorological warnings and urgent information to ships

NBDP

Narrow Band Direct Printing

NCU

Network Control Unit

NDB

Non-Directional Radio Beacon

NF

Noise Figure

NFC

Near Field Communication

NGMN

Next Generation Mobile Networks

NGSO

Non-GeoStationary Orbit

NJFA

NATO Joint Civil/Military Frequency Agreement

NL

Maritime radionavigation land station

NLOS

Non Line of Sight

NMR

Nuclear Magnetic Resonance

NMT

Nordic Mobile Telephone

NOAA

1) National Oceanic and Atmospheric Administration
2) Polar METSAT

Non-GSO

Non Geostationary Orbit

NR

Radionavigation mobile station
also: New Radio (5G)

NTFA

National Table of Frequency Allocations

NTSC

National Television Systems Committee

NVIS

Near Vertical Incidence Skywave

NWA

Nomadic Wireless Access

NWP

Numerical Weather Prediction

OB

Outside Broadcasting

OBU

On-Board Unit

OD

Oceanographic Data Station

ODC

Object Discrimination and Characterization

OE

Oceanographic data interrogation station

OFDM

Orthogonal Frequency Division Multiplexing

OFDMA

Orthogonal Frequency Division Multiple Access

OIRT

The International Radio and Television Organisation

OOB

Out-of-Band

ORM

Operator Review Meetings

OW

Optical Wireless

P-MP

Point-to-Multipoint

P-P

1) Point-to-Point
2) Peak-to-Peak

P-RNAV

Precision Area Navigation

PAD

Programme Associated Data

PAL

Phase Alternate Line (Colour TV standard)

PAMR

Public Access Mobile Radio

PAR

Precision Approach Radar

PCM

Pulse Code Modulation

PCN

Personal Communication Network

PDA

PreDetermined Arc

pfd, PFD

Power Flux Density

PLB

Personal Locator Beacon

PLC

Powerline Communications

PM

Phase Modulation

PMR

Professional Mobile Radio/Private Mobile Radio

PMSE

Programme Making and Special Events services

PP

Plenipotentiary Conference

PPDR

Public Protection and Disaster Relief

PSK

Phase Shift Keying

PSR

Primary Surveillance Radar

PT

Project Team

PVRS

Radio Spectrum Utilisation Plan

PWAP

Private Wide Area Paging

PWMS

Professional Wireless Microphone Systems

QAM

Quadrature Amplitude Modulation

QoS

Quality of Service

QPSK

Quadrature Phase Shift Keying

R&TTE

Radio&Telecommunications Terminal Equipment

RA

(1) Radiocommunication Assembly
(2) Radio Astronomy
(3) Radar Altimeter

Racon

Radio Beacon

Rádiový kanál / Radio channel

The range of radio spectrum defined by lower and upper frequencies, or alternatively by another unambiguous way, e.g. centre frequency and channel raster.

RAG

Radiocommunication Advisory Group

RAS

Radio Astronomy Service

RCC

(1) Rescue Coordination Center
(2) Regional Commonwealth in the Field of Communications

RDARA

Regional And Domestic Air Route Area

RDS

1) Radiodetermination Service
2) Radio Data Service nebo Radio Data System

RDSS

Radiodetermination-Satellite Service

REC, Rec.

Recommendation

Rep.

report

RES, Res.

Resolution

Rev.

Revision of document

RF

Radio Frequency

RFID

Radio Frequency Identification Device

RIS

River Information System

RISC

Railway Interoperability and Safety Committee

RLAN

Radio Local Area Network

RLS

Radiolocation Service

RLSS

Radiolocation-Satellite Service

RM

Maritime radionavigation mobile station

RN

Radionavigation land station

RNAV

Area Navigation

RNS

RadioNavigation Service

RNSS

RadioNavigation Satellite Service

ROC

Restricted Operator's Certificate

ROES

Receive Only Earth Stations

RoP

Rules of Procedure

RPA

Remotely Piloted Aircraft

RPC

Remote Piloting Centre

RR/RŘ

Radio Regulations is an international agreement regulating the conditions for the use of frequencies for mobile, satellite and other communications in accordance with new technologies, the needs of the market and users of the radio spectrum.

rr/RR

(1) rr = radio relay
(2) RR = Radio Regulations

RRB

Radio Regulations Board

RSBN

Radiolocation System for Short Range Navigation

RSC

Radio Spectrum Committee

RSM

Radio Speed Meter

RSMS

Radar Sensing and Measurement System

RSP

Responder Beacon

RSPG

Radio Spectrum Policy Group

RSPP

Radio Spectrum Policy Programme

RSR

en-Route Surveillance Radar

RSSI

Received Signal Strength Indication

RSU

Road Side Unit

RTCA

Radio Technical Commission for Aeronautics

RTTT

Road Transport and Traffic Telematics

Rx

Receiver [Rec. ITU-R M.1371-3]

S-DAB

Satellite Digital Audio Broadcasting

S-PCS

Satellite Personal Communication System

s/E

Space-to-Earth direction

S/N

Signal-to-Noise ratio

SA

Meteorological aids mobile station

SAA, S&A

Sense and Avoid

SAB

Service Ancillary for Broadcasting

SAB/SAP

Service Ancillary for Broadcasting/Service Ancillary for Program

SAP

Service Ancillary for Program

SAR

1) Search and Rescue
2) Synthetic Aperture Radar

SARPs

Standards And Recommended Practices

SARSAT

Search and Rescue Satellite Aided Tracking (see COSPAS)

SART

Search and Rescue Transponder

SATCOM

Satellite Communications

SBAS

Satellite Based Augmentation System

SBR

Surface-Based Radar

SC

Special Committee on regulatory/procedural matters

SDR

1) Satellite Digital Radio
2) Software Defined Radio

SECAM

Séquentiel Couleur á Mémoire

SES

Single European Sky

SESAR

Single European Sky ATM Research Programme

SFCG

Space Frequency Coordination Group

SFN

Single Frequency Network

SG

Study Group

SG-RFC

Steering Group on Radio Frequency Coordination

SHF

Super High Frequency

SINR

Signal to Interference and Noise Ratio

SIT

Satellite Interactive Terminal

SM

Meteorological aids land station

SMOS

Soil Moisture and Ocean Salinity

SMR

Surface Movement Radar

SNG

Satellite News Gathering

SNR

Signal to Noise Ratio

SOL

Safety of Life

SOLAS

International Convention for the Safety of Life at Sea

SOS

Space Operation Service

SOTDMA

Self-Organized Time Division Multiple Access

SRD

Short Range Device

SRR

Automotive Short Range Radar

SRS

Space Research Service

SS

Standard frequency and time signal station

SSAS

Ship Security and Alerting Systems

SSB

Single Side Band

SSR

Secondary Surveillance Radar

STB

Set-top-box

SUT

Satellite User Terminal

SVTR

Trophospheric Scatter System

T-DAB

Terrestrial-Digital Audio Broadcasting

T-DMB

Terrestrial Digital Multimedia Broadcasting

T&C

Telemetry and Command

TACAN

Tactical Aeronautical Navigation

TACS

Total Access Communication System

TAPS

TETRA Advanced Packed Data Service

TCAM

Telecommunication Conformity Assesment and Market Surveillance Committee

TDD

Time Division Duplex

TDM

Time Division Multiplexing

TDMA

Time Division Multiple Access

TEDS

TETRA Enhanced Data Services

TES

Transportable Earth Stations

TETRA

Terrestrial Trunked Radio

TFTS

Terrestrial Flight Telecommunication System

TG

Task Group. See also JTG

TIG

Time-invariant Gain

TLPR

Tank Level Probing Radar

TPC

Transmit Power Control

TRA-ECS

Terrestrial Radio Applications Capable of Providing Electronic Communications Services

TRR

Tactical Radio Relays

TS

Terminal Station

TSB

Telecommunication Standardization Bureau

TT&C

Telemetry, Tracking and Commands

TTT

Transport and traffic telematics

TV

Television

TVG

Time-Variant Gain

TVOB

Television Outside Broadcast

TVWS

TV White Spaces

TWIM

Terrestrial Wireless Interactive Multimedia

Tx

Transmitter

UA

Unmanned Aircraft

UAC

Urban Area Coverage

UACS

Unmanned Aircraft Control Station

UAS

Unmanned Aircraft Systems

UAT

Universal Access Transceiver

UAV

Unmanned Air Vehicle

UDF

Ultra High Frequency Direction-Finding Station

UHF

Ultra High Frequency

UIC

Iternational Railways Union

UL

Uplink

ULP-AID

Ultra Low Power Animal Implant Devices

ULP-AMI

Ultra Low Power Active Medical Implants

ULP-MMI

Ultra Low Power Medical Membrane Implants

UMTS

Universal Mobile Terrestrial System/Universal Mobile Telecommunications System

USB

Universal Serial Bus

UTRA

UMTS Terrestrial Radio Access

UWB

Ultra Wide Band

VDES

VHF data Exchange system

VDF

Very High Frequency Direction-Finding Station

VDL

VHF Data Link

VGE

Voluntary Group of Experts

VHF

Very High Frequency

VLBI

Very Long Baseline Interferometry

VLF

Very Low Frequency

VoIP

Voice over Internet Protocol

VOR

VHF Omnidirectional Radio Range

VORTAC

VOR and TACAN combination

VOX

Voice Activation Exchange

VR

Vehicle Radar

VSAT

Very Small Aperture Terminal

VTS

(1) Vessel traffic services
(2) Vessel Traffic System (radar)

WAIC

Wireless Avionic Intra-Aircraft Communications

WAPECS

Wireless Access Policy for Electronic Communications Services

WARC

World Administrative Radio Conference

WAS/RLAN

Wireless Access Systems/Radio Local Area Network

WCDMA

Wideband Code Division Multiple Access

WG

Working Group

WGFM

Working Group Frequency Management

WGS

World Geodetic System

WGSE

Working Group Spectrum Engineering. EPT group developing technical guidelines for the use of the frequency spectrum by various radiocommunication services, sharing criteria for the use of the same band, compatibility criteria for the use of different bands.

WiGig

Wireless Gigabit

WiMax

Worldwide Interoperability for Microwave Access

WLAM

Wideband Low Activity Mode

WLAN

Wireless LAN

WLL

Wireless Local Loop

WMO

World Meteorological Organization

WP

Working Party

WPAN

Wireless Personal Area Network

WPR

Wall-Probing Radar

WPT

Wireless Power Transmission

WRC

World Radiocommunication Conference

WRC-03

World Radiocommunication Conference 2003

WRC-07

World Radiocommunication Conference 2007

WRC-12

World Radiocommunication Conference 2012

WRC-2000

World Radiocommunication Conference 2000

WRC-23

World Radiocommunication Conference 2023 ITU

WSD

White Space Devices

WSIS

World Summit on the Information Society

WTDC

World Telecommunication Development Conference; note: Telecommunication Development Sector (ITU-D)

WTO

World Trade Organisation

WTSA

World Telecommnication Standardization Assembly

WWW

1) World Wide Web
2) World Weather Watch

X-QAM

Quadrature Amplitude Modulation (X states)

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