Acronyms and Abbreviations
| 1D | One-dimensional |
| 2D | Two-dimensional |
| 3D | Three-dimensional |
| 3GM | Gravity and Geophysics of Jupiter and the Galilean Moons |
| AACS | Attitude and Articulation Control Subsystem |
| ACE | Advanced Composition Explorer |
| ACE | Call Sign for Project Real-time Mission Controller |
| ACQ | Acquisition |
| ACS | Antenna Control System |
| ADC | Analog-to-digital Conversion |
| AGC | Automatic Gain Control |
| AMC | Advanced Media Calibration Subsystem |
| AMELIA | ExoMars Atmospheric Mars Entry and Landing Investigations and Analysis |
| AMMOS | Advanced Multi-mission Operations System |
| AMS | Antenna Microwave System |
| AOS | Acquisition of Signal |
| APA | Antenna Pointing Assembly |
| APL | Applied Physics Laboratory |
| ARI | Advanced Ranging Instrument |
| ASCII | American Standard Code for Information Interchange |
| ASI | Agenzia Spaziale Italiana (Italian Space Agency) |
| ASIC | Application-specific Integrated Circuit |
| ATDF | Archival Tracking Data File |
| ATLO | Assembly, Test, and Launch Operations |
| AU | Astronomical Unit |
| AutoNav | Autonomous Navigation |
| AUX | Auxiliary |
| Aux Osc | Auxiliary Oscillator |
| AWVR | Advanced Water Vapor Radiometer |
| AZ | Azimuth |
| BER | Bit-error Rate |
| BLF | Best-lock Frequency |
| BOA | Beginning of Activity |
| BOT | Beginning of Track |
| BPF | Band Pass Filter |
| BPM | Bits Per Minute |
| BPS | Bits Per Second |
| BPSK | Binary Phase-shift Keying |
| BSR | Bistatic Radar |
| BVA | Boîtier à Vieillissement Amélioré (enclosure with improved aging) |
| BVE | Block-V Exciter |
| BVR | Block-V Receiver |
| BW | Bandwidth |
| BWG | Beam ... |
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