| 
AAA
 | 
 | A&P | 
Astronomy  & Physics | 
| 
ACE
 | 
Advanced Composition Explorer
 | 
| 
ACE
 | 
Attitude Control
 Electronics | 
| 
ACS
 | 
Attitude Control System
 | 
| 
ADC
 | 
Analog to Digital Converter
 | 
| 
ADP
 | 
Acceptance Data Package
 | 
| 
ADSP
 | 
Digital Signal Processor (Analog Devices)
 | 
| 
AETD
 | 
Applied Engineering
 and Technology Division | 
| 
AFC
 | 
Attitude Flight Computer
 | 
| 
AGC
 | 
Automatic Gain Control
 | 
| 
AIA
 | 
Atmospheric
 Imaging Assembly | 
| 
AIT
 | 
Assembly, Integration, and Test
 | 
| 
AIU
 | 
Attitude Interface Unit
 | 
| 
AKM
 | 
Apogee Kick
 Motor | 
| 
ALERT
 | 
Acute Launch Emergency Restraint Tip
 | 
| 
ALU
 | 
Arithmetic Logic Unit
 | 
| 
AMS
 | 
Austria Micro Systems
 | 
| 
AO
 | 
Announcement of Opportunity
 | 
| 
AOS
 | 
Acquisition of Signal
 | 
| 
APID
 | 
Application Identifier
 | 
| 
APL
 | 
Applied Physics Laboratory
 | 
| 
APM
 | 
Antenna Potential Monitor
 | 
| 
AR
 | 
Acceptance Review
 | 
| 
AR
 | 
Anti-Reflection
 | 
| 
ARR
 | 
Authentication Return Receipt
 | 
| 
ASAP
 | 
Advanced Systems Analysis Program
 | 
| 
ASIC
 | 
Application Specific Integrated Circuits
 | 
| 
ASO
 | 
Application Specific Output
 | 
| 
ASO
 | 
Astronomical
 Search for Origins | 
| 
ASRG
 | 
Astrophysics and Space Research Group
 | 
| 
AST
 | 
Autonomous Star Tracker
 | 
| 
AT
 | 
Acceptance Test
 | 
| 
ATC
 | 
Advanced Technology Center
 | 
| 
ATC
 | 
Amplitude to Time Converter
 | 
| 
ATM
 | 
Asynchronous
 Transfer Mode | 
| 
ATMEL
 | 
Company Name
 | 
| 
ATP
 | 
Authorization
 to Proceed | 
| 
AU
 | 
Astronomical Unit
 | 
 
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