AAS	American Astronautical Society
ABC	American Broadcasting Company
ACTS	Advanced Communications Technology Satellite (NASA)
AFB	Air Force Base
AFCRC	Air Force Cambridge Research Center
AFSPACECOM	Air Force Space Command
AHCIET	Asociacion Hispanoamericana de Centros de Investigacion y Empresas de Telecomunicaciones
AIAA	American Institute of Aeronautics and Astronautics
AMIC	Asian Mass Communication Research and Information Centre
AMSC	American Mobile Satellite Corporation (satellite)
ARPA	Advanced Research Projects Agency (DoD)
ASC	American Satellite Company (also the acronym for the company's satellite)
AT&T	American Telephone and Telegraph
ATA	Air Transport Association
ATC	Air Training Command
ATS	Applications Technology Satellite (NASA)
Az-El	azimuth-elevation (type of antenna mounting)
BBC	British Broadcasting Company
BBCWST	BBC World Service Television
BMEWS	Ballistic Missile Early Warning System
Caltech	California Institute of Technology
CCTV	Central China Television
CEPT	European Conference of Postal and Telecommunication Administrations (translated from French acronym)
CERN	European Organization for Nuclear Research (English translation)
CETS	European Conference on Satellite Communications (translated from French acronym)
Comsat	Communications Satellite Corporation
CNES	Centre National d'études Spatiales (French space agency)
CNN	Cable News Network
CNNI	Cable News Network International
CSIRO	Commonwealth Scientific and Industrial Research Organisation
CTS	Communications Technology Satellite (NASA-Canadian program)
DCA	Defense Communications Agency (DoD)
DCS	Defense Communications System (DoD)
DEC	declination
DEW	Distance Early Warning (Line)
DFH	Dong Fang Hong (Chinese satellite)
DoD (U.S.)	Department of Defense
DSCS	Defense Satellite Communications System (DoD)
DSIR	Department of Scientific and Industrial Research (Manchester University)
EBU	European Broadcasting Union
ECS	European Communication Satellite (ESA series) or Environmental Communication Satellite (China)
EHF	extremely high frequency
ELDO	European Launcher Development Organization
ESA	European Space Agency
ESC	European Space Conference
ESRO	European Space Research Organization
Euratom	European Atomic Energy Community
EUTELSAT	European Telecommunications Satellite (Organization)
FAA	Federal Aviation Administration (DOT)
FCC	Federal Communications Commission

FEP	FLTSAT EHF Package
GAO	Government Accounting Office
GEOS	Geodynamics Experimental Ocean Satellite
GNP	gross national product
HA	hour angle
H.M.S.O.	His or Her Majesty's Stationer's Office (British government printing office)
IDCSP	Initial Defense Communications Satellite Program (DoD)
IDSCS	Initial Defense Satellite Communications System Program (DoD; formerly IDCSP)
IEEE	Institute of Electric and Electronic Engineers
IGIA	Interagency Group on International Aviation
IGY	International Geophysical Year
INCOSPAR	Indian National Committee for Outer Space Research
Inmarsat	International Mobile (formerly Maritime) Satellite (Organization)
INSAT	Indian National Satellite
Intelsat	International Telecommunications Satellite (Organization)
IRE	Institute of Radio Engineers
ISIS	International Satellites for Ionospheric Studies (NASA-Canadian program)
ITT	International Telephone and Telegraph
ITU	International Telecommunications Union
JPL	Jet Propulsion Laboratory (NASA)
KDD	Kokusai, Denshin, Denwa (Japanese company)
LES	Lincoln Experimental Satellite
LET	Lincoln Experimental Terminal
MBB	Messerschmit-Bolkow-Blohm (German company)
MILSATCOM	Military Satellite Communications (DoD)
Milstar	Military, Strategic, Tactical and Relay (Air Force satellite program)
MIT	Massachusetts Institute of Technology
MLF	Multilateral Force
MSAT	Mobile communications satellite (Canadian civilian spacecraft)
MUSAT	Mobile UHF Satellite (never implemented Canadian proposal)
NACA	National Advisory Committee for Aeronautics
NASA	National Aeronautics and Space Administration
NATO	North Atlantic Treaty Organization
NRL	Naval Research Laboratory
NRO	National Reconnaissance Office (DoD)
NSAM	National Security Action Memorandum
OCS	Operational Communication Satellite (China)
OECD	Organization for Economic Cooperation and Development
OTS	Orbiting Test Satellite (ESRO)
PAMOR	Passive Moon Relay
PAS	Perigee-Apogee System
RCA	Radio Corporation of America
RCTI	Rajawah Citra Televisi Indonesia
RP	Research Publication (NASA)
RRSS	Returnable Remote Sensing Satellite (China)
RTG	radioisotope thermoelectric generator
SAMSO	Space and Missile Systems Organization (U.S. Air Force)
SBS	Satellite Business Systems (also the acronym for the company's satellite)
SCAMP	Single-Channel Advanced Milstar Portable (terminal)
SCORE	Signal Communication by Orbiting Relay Equipment (DoD satellite)

SCOTT	Single-Channel Objective Tactical Terminal
SEREB	Société pour l'étude et la Realisation d'Engins Balistiques
SHARE	Satellites for Health and Rural Education in English
SHF	superhigh frequency
SITE	Satellite Instructional Television Experiment (India)
SMU	Southern Methodist University
SP	Special Publication (NASA)
Star	Satellite Television Asia Region
STEP	Symphonie Telecommunications Experimental Project
Syncom	Synchronous Communications (satellite)
TACSAT	Tactical Satellite (U.S. Army)
TAT	transatlantic telephone (cable)
TDRSS	Tracking and Data Relay Satellite System
TIROS	Television and Infrared Operational Satellite
TRW	Thompson-Ramo-Wooldridge, Inc.
TTS	Technical Test Satellite (China)
UHF	ultrahigh frequency
URSI	Union Radioscientifique Internationale
USIA	U.S. Information Agency
USSPACECOM	U.S. Space Command (DoD)
USSR	Union of Soviet Socialist Republics
VHF	very high frequency

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