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ACSM
| : American Congress on Surveying and Mapping |
| A/D |
: Analog-to-Digital |
| Ada |
: A higher order programming language developed during the 1970s for the DOD (note: not an acronym, named for first computer programmer, Ada Augusta Byron) |
| ADC |
: Air Data Computer |
| ADF |
: Automatic Direction Finder: a navigation receiver |
| ADI |
: Attitude Director Indicator |
| ADS |
: Automatic Dependent Surveillance: a potential feature for a/c position reporting, e.g., via SATCOM |
| ADS-B |
: ADS-Broadcast |
| AE |
: Antenna Electronics |
| AEEC |
: Airlines Electronic Engineering Committee |
| AFCS |
: Automatic Flight Control System |
| AFI |
: Automatic Fault Indication |
| AFIS |
: Airborne Flight Information Service |
| AFS |
: Air Force Station |
| AGL |
: above ground level |
| AGU |
: American Geophysical Union |
| AHRS |
: Attitude-Heading Reference System |
| AIA |
: Aerospace Industries Association |
| AIAA |
: American Institute of Aeronautics and Astronautics |
| AIMS |
: Airspace Traffic Control Radar Beacon System |
| A/J |
: Anti-Jamming AOCAuxilliary Output Chip |
| ALT |
: altitude |
| AM |
: Amplitude Modulation |
| AMLCD |
: Active Matrix Liquid Crystal Display |
| ANSI |
: American National Standards Institute |
| ANSIR |
: Advanced Navigation System Inertial Reference* |
| ANP |
: Actual Navigation Performance |
| AOA |
: angle-of-attack |
| AOG |
: Aircraft-On-Ground |
| AOPA |
: Aircraft Owners and Pilots Association |
| A/P |
: Autopilot |
| APC |
: Active Point Control |
| APU |
: Auxiliary Power Unit |
| ARINC |
: Aeronautical Radio, Incorporated: a nonprofit corporation owned by member airlines to define form, fit and function of avionics equipment |
| ARNIC 429 |
: standard for broadcast digital information transfet systems for general applications |
| ARNIC 561 |
: Inertial navigation system specifications |
| ARNIC 571 |
: Inertial sensor attitude-heading reference system specifications |
| ARNIC 575 |
: Digital air data system specifications |
| ARNIC 700-series |
: All-digital equipment specifications for new-generation transport category aircraft |
| ARSA |
: Airport Radar Service Area |
| AS |
: Antispoofing |
| ASCB |
: Avionics Standard Communication Bus |
| ASCII |
: American Standard for Information Exchange |
| ASI |
: Airspeed Indicator |
| ASIC |
: Application-Specific Integrated Circuit |
| ASL |
: above sea level |
| AST |
: apparent sidereal time |
| A/T |
: autothrottle |
| ATC |
: air traffic control |
| ATCRBS |
: Air Traffic Control Radar Beacon System |
| ATE |
: Automatic Test Equipment |
| ATLAS |
: Abbreviated Test Language for Avionics Systems |
| AZ |
: azimuth: angular measurement in horizontal plane |
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| B |
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| BCD |
: Binary Code Decimal |
| BEA |
: Bureau d’Enquetes Accidents: French equivalent of NTSB |
| BIH |
: Bureau International de L'Heure |
| BIPM |
: Bureau international des poids et Mesures |
| BIT |
: Built-in Test |
| BITE |
: Built-in Test Equipment |
| BPS |
: Bits Per Second |
| B-NAV |
: Basic Area Navigation: concept of easing congestion in European airways by requiring aircraft to be fitted with equipment that will allow more direct routings by ATC |
| BPSK |
: Bi Phase Shift Keying
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| C | |
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C/A-code |
: Course/aquisition code (1.023 MH) |
| CADC |
: Central Air Data Computer |
| CAD/CAM |
: Computer Aided Design/Computer Aided Manufacture |
| CCA |
: Circuit Card Assembly |
| CDI |
: Course Deviation Indicator |
| CDMA |
: Code Division Multiplex Access |
| CD-ROM |
: Compact Disc-Read Only Memory |
| CDU |
: Control Display Unit |
| CEP |
: Circular Error Probable |
| CG |
: Center of Gravity |
| CIGNET |
: Cooperative International GPS Network |
| CMC |
: Central Maintenance Computer |
| CMOS |
: Complementary Metal Oxide Semiconductor |
| C/No |
: Carrier to Noise Ratio |
| CPA |
: Closest Point of Approach (TCAS) |
| CRPA |
: Controlled Radiation Pattern Antenna |
| CSOC |
: Consolidated Space Operations Center |
| CTP |
: Conventional terrestrial Pole |
| CTRS |
: Conventionnal terrestrial Reference System |
| CW |
: Continuous Wave
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| D | |
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D/A |
: Digital-to-Analog Conversion |
| dB |
: decibel: acoustic measurement unit |
| DG |
: Directional Gyro |
| DGPS |
: Differential GPS |
| D-Level |
: Depot Level |
| DLM |
: Data Loader Module |
| DLR |
: Data Loader Receptable |
| DLS |
: Data Loader System |
| DMA |
: Defense Mapping Agency |
| DME |
: Distance Measuring Equipment |
| DoD |
: Department of Defense |
| DOP |
: Dilution of Precision |
| DoT |
: Department of Transportation (U.S.) |
| DR |
: deduced reckoning or dead reckoning |
| DRAM |
: Dynamic Random Access Memory |
| DRC |
: Dead Reckoning Compass |
| dRMS |
: Distance Root Mean Square |
| DRS |
: Dead Reckoning System |
| DT&E |
: Development Test and Evaluation |
| DU |
: Display Unit |
| DUATS |
: Direct User Access Terminal System
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| E | |
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EADI |
: Electronic Attitude Direction Indicator (see ADI) |
| EBDBDBD |
: "That's All Folks" |
| ECEF |
: Earth-Centered-Earth-Fixed |
| ECP |
: Engineering Change Proposal |
| EDM |
: Distance Measurement |
| EDRD |
: Enhanced Dead Reckoning Device |
| EEPROM |
: Electrically Erasable Programmable Read-Only Memory |
| EFIS |
: Electronic Flight Instrument System |
| EHSI |
: Electronic Horizontal Situation Indicator (see HSI) |
| EIA |
: Electronic Industries Association |
| EM |
: Electro Magnetic |
| EMCON |
: Emission Control |
| EMI |
: Electromagnetic Interference |
| EPROM |
: Erasable Programmable Read-Only Memory |
| ESGN |
: Electrically Suspended Gyro Navigator
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| F | |
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FAA |
: Federal Aviation Administration (U.S.) |
| FBO |
: Fixed-Base Operator |
| FM |
: Frequency Modulation |
| FMS |
: Foreign Military Sales |
| FOM |
: Figure Of Merit |
| FOG |
: Fiber Optic Gyro (see IFOG) |
| FRPA |
: Fixed Radiation Pattern Antenna |
| FRPA-GP |
: FRPA Ground Plane
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| G | |
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GaAs |
: Gallium Arsenide |
| GAST |
: Greenwich apparent sidereal time |
| GATT |
: General Agreement on Trade and Tariffs |
| GDOP |
: Global Dilution Of Precision |
| GIS |
: Geographic Information System |
| GLONASS |
: Global Orbiting Navigation Satellite System: CIS satellite navigation system version of GPS |
| GLS |
: GPS Landing System |
| GMST |
: Greenwich Mean Sidereal Time |
| GMT |
: Greenwich Mean Time: used in navigation systems; Zulu |
| GNS |
: Global Navigation System (like GPS, but broader -- now the preferred term by Honeywell) |
| GNSS |
: Global Navigation Satellite System |
| GNSSU |
: Global Navigation Satellite Sensor Unit (the GNS receiver component of a GNS)* |
| GO/NG |
: Go/No Go |
| GPIRS |
: Global Positioning/Inertial Reference System* |
| GPS |
: Global Positioning System (see GNS) |
| GPSIC |
: Global Positioning System information Center |
| GS |
: Groundspeed |
| GSM |
: Global System Mobile (cellular)
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| H | |
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HDOP |
: Horizontal dilution of precision |
| HERF |
: High-Energy Radio Frequency or High-Energy Radiated Fields: dense electromagnetic fields created by radio/TV transmitters -- possible source of interference for electronic instruments |
| HF |
: High Frequency: 3-30 MHz |
| HFDL |
: High Frequency Data Link |
| HOW |
: Hand Over Word |
| HSI |
: Horizontal Situation Indicator |
| HV |
: Host Vehicle |
| HW |
: hardware |
| Hz |
: Hertz: cycles per second
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| I | |
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IAG |
: International Association of Geodesy |
| IATA |
: International Air Transport Association: economic association of commercial airlines |
| ICD |
: Interface Control Document |
| ICS |
: Initial Control System |
| IEEE |
: Institute of Electrical and Electronics Engineers |
| IERS |
: International Earth Rotation Service |
| IF |
: Intermediate Frequency |
| IFF |
: Identification Friend or Foe |
| IFOG |
: Interferometric Fiber Optic Gyro (see FOG) |
| IFR |
: Instrument Flight Rules: see IMC |
| I-Level |
: Intermediate Level |
| ILS |
: Instrument Landing System |
| IM |
: Inner Marker (glideslope) |
| IMU |
: Inertial Measurement Unit |
| Inmarsat |
: International Maritime Satellite Organization -- international cooperative of more than 50 countries that operates a global system of satellites for mobile communications, such as SATCOM. |
| INS |
: Inertial Navigation System |
| I/O |
: Input/Output |
| ION |
: Institute of Navigation |
| IOT&E |
: Operational Test and Evaluation |
| IP |
: Instrumentation Port |
| IR |
: Infrared |
| IRS |
: Inertial Reference System |
| IRU |
: Inertial Reference Unit: part of IRS |
| ISO |
: International Standards Organization |
| ITS |
: Intermediate Level Test Set |
| ITS |
: Intelligent Transport System |
| ITRF |
: International Terrestrial Reference Frame |
| IVSI |
: Instantaneous Vertical Speed Indicator
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| J | |
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JPO |
: Joint Program Office |
| J/S |
: Jamming to Signal Ration |
| JTIDS |
: Joint Tactical Information Distribution System
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| K | |
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K |
: thousand |
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KHz |
: KiloHertz |
| KT |
: Knots: nautical miles/hour
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| L | |
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L1 |
: L1 carrier (1575.42 MHz) |
| L2 |
: L2 carrier (1227.6 MHz) |
| LAAS |
: Local Area Augmentation System |
| LADGPS |
: Local area differential GPS |
| LASER |
: Light Amplification by Simulated Emission of Radiation |
| LAT |
: Latitude |
| LCD |
: Liquid Crystal Display |
| LED |
: Light-Emitting Diode |
| LEP |
: Linear Error Probable |
| LEO |
: Low Earth Orbit |
| LIDAR |
: Light Detection and Ranging |
| LO |
: Local Oscillator |
| LOC |
: Localizer: part of Instrument Landing System |
| LORAN |
: Long-Range Navigation: electronic pulse system for oceanic navigation |
| Loran-C |
: a hyperbolic grid navigation system |
| LRIP |
: Low Rate Initial Production |
| LRU |
: Line Replaceable Unit |
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| M | |
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mb |
: millibars |
| M |
: Mach number: speed of aircraft expressed in relation to speed of sound |
| M |
: million; mega |
| MCS |
: Master Control Station |
| MCT |
: Mean Corrective Maintenance Time |
| MEO |
: Medium Earth Orbit (satellite) |
| MHRS |
: Magnetic Heading Reference System |
| MHz |
: MegaHertz: a whole lot of Hertz |
| MLS |
: Microwave Landing System |
| MLV |
: Medium Launch Vehicle |
| MmaxCT |
: Maximum Corrective Maintenance Time |
| MOU |
: Memorandum of Understanding |
| MSL |
: Mean Sea Level (datum for altitude measurement) |
| MTBF |
: Mean Time Between Failures |
| MTBM |
: Mean Time Between Maintenance |
| MTBR |
: Mean Time Between Removals |
| MTBUR |
: Mean Time Between Unscheduled Removal
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| N | |
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N/A |
: Not Applicable |
| NASA |
: National Aeronautics and Space Administration (U.S.) |
| NAV |
: navigation |
| NAVAID |
: Navigational Aid |
| NAV-msg |
: Navigation Message |
| NAVSAT |
: navigation satellite |
| NAVSTAR |
: navigation satellite timing and ranging |
| NIH |
: Not Invented Here |
| NM |
: Nautical Mile: 1.15 statute miles or 1000 fathoms or 216,000 barleycorns; 60 nm = 1 degree of Earth's circumference |
| NMS |
: Navigation Management System |
| NMU |
: Navigation Management Unit |
| NOSC |
: Naval Ocean Systems Center |
| NRL |
: Naval Research Labratory |
| NS |
: Nanosecond (10-9 second) |
| NSA |
: National Security Agency |
| NTDS |
: Tactical Data System |
| NTS |
: Navigation Technology Satellite
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| O | |
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OBS |
: Omni Bearing Select |
| OCS |
: Operational Control System |
| OEM |
: Original Equipment Manufacturer |
| O-Level |
: Organization Level |
| OMS |
: On-Board Maintenance System |
| OTF |
: On The Fly ambiguity resolution |
| OTHT |
: Over The Horizon Targeting
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| P | |
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P-code |
: Precision code (10.23 MHz) |
| PDOP |
: Position dilution of Precision |
| PLSS |
: Precision Location Strike System |
| P I |
: Pre Planned Product Improvement |
| PPM |
: Part Per Million |
| PPM |
: Pulse Per Minute |
| PPS |
: Precision Positionning Service |
| PPS |
: Pulse Per Second |
| PPS-SM |
: PPS Security Module |
| PRF |
: Pulse Repetition Frequency: pertaining to radar |
| PRN |
: PseudoRange Noise |
| PROM |
: Programmable Read-Only Memory |
| Ps |
: Pressure, static: air data measurement |
| psi |
: pounds/square inch |
| Pt |
: Pressure, total: air data measurement |
| PTTI |
: Precise Time and Time Interval |
| PVT |
: Velocity and Time
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| Q | |
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QNH |
: sea level pressure
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| R | |
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RA |
: Radio Altitude |
| RADAR |
: Radio Detection And Ranging |
| RAIM |
: Receiver autonomous Integrity Monitoring (GPS) |
| RAM |
: Random Access Memory |
| RCVR |
: Receiver |
| RDI |
: Radio Direction Indicator |
| RF |
: radio frequency |
| RFI |
: Request For Information |
| RFP |
: Request For Proposal |
| RFQ |
: Request For Quotation |
| RFU |
: Radio Frequency Unit, SATCOM component |
| RLG |
: Ring Laser Gyro |
| RMI |
: Radio Magnetic Indicator |
| RMU |
: Radio Management Unit |
| RMS |
: Root mean square |
| RNAV |
: Area Navigation |
| RNP |
: Required Navigation Performance |
| ROM |
: Read-Only Memory |
| RSS |
: Root Sum Square |
| RT |
: Remote Terminal |
| R/T |
: Receiver/Transmitter |
| RTCA |
: Radio Technical Commission for Aeronautics--now known simply as RTCA |
| RTCM |
: Radio Technical Commission for Maritime Service
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| S | |
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SA |
: Selective Availability -- re GPS |
| SAR |
: Search and Rescue: usually pertaining to weather radars and navigation (BCAS) |
| SAT |
: Static Air Temperature |
| SATCOM |
: Satellite Communications |
| SAMSO |
: Space and Missile Systems OrganizationSBB Smart Buffer Box |
| SC |
: Special Committee |
| SDU |
: Satellite Data Unit: SATCOM component |
| SEP |
: Spherical Error Probable |
| SI |
: International System of Units |
| SIL |
: System Integration Labratory |
| SINS |
: Shipborne INS |
| SLR |
: Satellite Laser Ranging |
| SMT |
: Surface-Mount Technology |
| SPS |
: Standard Positioning Service |
| SRU |
: Shop Replacable Unit |
| STDCDU |
: Standard CDU |
| SVN |
: Standard vehicule launch number |
| SW |
: software
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| T | |
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TACAN |
: Tactical Air Navigation |
| TAI |
: International Atomic Time |
| TBD |
: To Be Determined |
| TCA |
: Terminal Control Area |
| TDOP |
: Time dilution of Precision |
| TFOM |
: Time Figure Of Merit |
| TRACON |
: Terminal Radar Approach Control |
| TRANSIT |
: Navy Navigation Satellite System |
| TTFF |
: Time to First Fix |
| TTG |
: Time To Go |
| TTS |
: Time To Station |
| TTW |
: Time to Waypoint
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| U | |
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UE |
: User Equipment |
| UERE |
: User Equivalent Range Error |
| UHF |
: Ultra High Frequency: 300-3000 MHz |
| USNO |
: US Naval Observatory |
| UT |
: Universal Time |
| UTC |
: Universal coordinated time
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| V | |
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VDOP |
: Vertical dilution of Precision |
| VDR |
: VHF Data Radio |
| VG/DG |
: Vertical Gyro/Directional Gyro |
| VG |
: Vertical Gyro |
| VHF |
: Very High Frequency: 30-300 MHz -- "straight-line" signal used for communications and navigation |
| VHSIC |
: Very High Speed Integrated Circuit |
| VLBI |
: Very Long Baseline Interferometry |
| VLF |
: Very Low Frequency: 3 KHz-30 KHz -- used for long range navigation in combination with Omega |
| VLSIC |
: Very Large Scale Integrated Circuit |
| VNAV |
: Vertical Navigation |
| VOR |
: Very High Frequency (VHF) Omnidirectional Range |
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| W |
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| WAAS |
: Wide area augmentation system or service |
| WADGPS |
: Wide area differential GPS |
| WGS-84 |
: World Geodetic System 1984 |
| WPT |
: waypoint |
| WX |
: Weather |
| WXR |
: Weather Radar
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| X | |
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| Y | |
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Y-code
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: Encrypted P-code |
| YPG |
: Yuma Proving Ground
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| Z | |
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Z |
: zillion: 1 X 10z or 10 jillion |
| [-] |
: unit of sleep |
