A/D

analogue to digital

AAF

antialiasing filter

ABM

apogee burst motor

ACC

antenna control console

ACE

attitude control electronics

AceS

Asian satellite cellular system

ACI

adjacent channel interference

ACSSB

amplitude companded single sideband

ACU

antenna control unit

ADCS

attitude determination and control system

ADM

adaptive delta modulation

ADPCM

adaptive differential PCM (CCITT 32 kbit/s)

ADS

automatic dependent surveillance

ADSL

asymmetric digital subscribers loop

AEF

apogee engine firing

AFC

automatic frequency control

AGC

automatic gain control

AIT

assembly integration and test

AJ

antijamming

AKM

apogee kick motor

AM

amplitude modulation

AM/PM

amplitude to phase conversion

AMBE

advanced multiband excited (codes)

AMPS

advanced mobile phone system

AMSAT

radio amateur satellite corporation

AMSC

American Mobile Satellite Corporation

ANC

active nutation control

ANIK

Canadian domestic system

ANSI

American National Standards Institute

AOR

Atlantic ocean region

AOTS

advanced orbital test satellite

AP

assembly of parties (INTELSAT)

APK

amplitude and phase keyed

APM

antenna positioning mechanism

APMT

Asian Pacific mobile telecommunication system

ARABSAT

Arab Space Communications Organisation

ARQ

automatic repeat request

ASAP

aria structure for auxiliary payloads

ASC

Asian satellite computer

ASIC

application-specific integrated circuit

ATM

asynchronous transfer mode

ATME

automatic transmission measuring equipment

ATS

application technology satellite

AUC

authentication centre

AUSSAT

Australian domestic satellite system

AVD

alternative voice/data

AWGN

additive white Gaussian noise

AZ

azimuth

BAe

British Aerospace

BAPTA

bearing and power transfer assembly

BCH

Bose-Chaudhuri-Hocquenghem (code)

BDF

baseband distribution frame

BER

bit error ratio

BG

board of governors (INTELSAT)

BG/PC

BG's advisory committee on planning (INTELSAT)

BG/T

BG's advisory committee on technical matters (INTELSAT)