| A/D | Analog-to-digital (conversion) |
| ADC | Analog-to-digital converter |
| ADR | Accumulated delta range |
| ADS | Automatic dependent surveillance |
| AGC | Automatic gain control |
| AHRS | Attitude and heading reference system |
| AIC | Akaike information-theoretic criterion |
| AIRS | Advanced inertial reference sphere |
| ALF | Atmospheric loss factor |
| ALS | Autonomous landing system |
| altBOC | Alternate binary offset carrier |
| AODE | Age of data word, ephemeris |
| AOR-E | Atlantic Ocean Region East (WAAS) |
| AOR-W | Atlantic Ocean Region West (WAAS) |
| AR | Autoregressive |
| ARMA | Autoregressive moving average |
| ASD | Amplitude spectral density |
| ASIC | Application-specific integrated circuit |
| ASQF | Application-Specific Qualification Facility (EGNOS) |
| A-S | Antispoofing |
| ATC | Air traffic control |
| BOC | Binary offset carrier |
| BPSK | Binary phase-shift keying |
| C/A | Coarse acquisition (channel or code) |
| C&V | Correction and verification (WAAS) |
| CDM | Code-division multiplexing |
| CDMA | Code-division multiple access |
| CEP | Circle error probable |
| CNMP | Code noise and multipath |
| CONUS | Conterminous United States, also Continental United States |
| CORS | Continuously operating reference station |
| COSPAS | Acronym from transliterated Russian title“Cosmicheskaya Sistyema Poiska Avariynich Sudov,” meaning “Space System for the Search of Vessels in Distress” |
| CPS | Chips per second |
| CRC | Cyclic redundancy check |
| CWAAS | Canadian WAAS |
| DGNSS | Differential GNSS |
| DGPS | Differential GPS |
| DME | Distance measurement equipment ... |
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