Acronyms And Abbreviations - NASA
Acronyms and AbbreviationsAACSattitude and articulation control subsystemABMaerobraking maneuverABXaerobraking exitAcacquisition (also ACQ)ACEAdvanced Composition ExplorerACEcall sign for project real-time mission controllerACISantenna control and interface subsystemACKacknowledgmentACQacquisition (also Ac)ACSattitude control systemA/Danalog to digitalADCanalog to digital converterADRadaptive data ratesAGCautomatic gain control (received carrier power)AGLabove ground levelAhrampere hourAISancillary information subsystemAlBeMettrade name of aluminum beryllium compositeproduced by Brush Wellman Inc.ALCautomatic level controlAMante meridianAMMOSAdvanced Multimission Operations SystemAOA, AoAangle of attackAOSadvanced orbiting systemsAPIDapplication process identifierAPXSalpha particle X-ray spectrometerARCAmes Research CenterARFautomatic restart functionARQautomatic repeat queuingARQautomatic repeat request521
522Acronyms and AbbreviationsASCIIAmerican Standard Code for Information InterchangeASIItalian Space AgencyASICapplication-specific integrated circuitAssyassemblyATCMauto trajectory correction maneuverATLOAssembly, Test, and Launch OperationsATNattenuatorATSaft transition structureAUastronomical unit ( 1.496 108 km)AutoNavautonomous navigationaux oscauxiliary oscillatorAWGNadditive white Gaussian noisebbit(note: telecommunications uses bits [b]; data storage usesbytes [B], which are 8 bits per byte)BBPPbase-band patch panelBCbuss controllerBECObooster engine cutoffBERbit-error rateBIPbackshell interface plateBLFbest-lock frequencyBLGAbackshell low gain antenna on MER2BLOloop bandwidth (reference at threshold)BMLbackup mission load bps (bits per second (bps)BMOXBeacon-Monitor Operations ExperimentBODAburnout detection algorithmBoLbeginning of lifeBPFbandpass filterBPMUHF radio frequency module (MRO)bpsbits per secondBPSKbinary phase-shift keyingBSbachelor of science
Acronyms and Abbreviations523BSSbackshell separationBTDbuffered telemetry demodulatorBTUBritish thermal unit (1.06 kilojoule)BUDbridle, umbilical, descent-rate-limiter deviceBVRBlock V ReceiverBWbandwidthBWGbeam waveguideC3launch-specific energyCANCanberra (Deep Space Communications Complex)CASCassini ProjectCBEcurrent best estimateCBMCommunications Behavior ManagerCBMcruise balance massC&Ccommand and controlCCAFSCape Canaveral Air Force StationCCAMcollision and contamination avoidance maneuverCCBcommon core boosterCCScomputer command subsystemCCSDSConsultative Committee for Space Data SystemsCDcumulative distributionC&DHcommand and data handlingCDRCentral Data RecorderCDRCritical Design ReviewCDScommand data subsystemCDSCCCanberra Deep Space Communications Complex (DSCC)CDUcommand detector unitCEPcircular error probabilityC.E.convolutional encodingCFDPCCSDS (Consultative Committee for Space Data Systems)file delivery protocolCGcenter of gravityCLBWcarrier-loop bandwidth
524Acronyms and AbbreviationsChemCamChemistry and mineralogy camera (MSL)CheMinChemistry and Mineralogy (makes X-ray diffraction analysesof rock and soil samples, MSL)C-ISACentaur interstage adapterCLAcarrier-lock accumulatorCLGAcruise low-gain antenna on MERClkclockCLK GENclock generatorCLTUcommand link transmission unitcmcentimeterCMAcommand modulator assemblyCmdcommandCMDRADcommand radiationCMEcoronal-mass ejectionCNRcarrier-to-noise ratioCommcommunication, or on a diplexer, common port(connected to an antenna)conscanconical scanningCPcouplercPCIcompact peripheral component interconnectCPAcommand processor assemblyCRCcyclic redundancy checkCRISMCompact Reconnaissance Imaging Spectrometerfor Mars Reconnaissance Orbiter (MRO)CRScosmic ray system (Voyager)CScheck sumCSIROCommonwealth Scientific and Industrial ResearchOrganization (Australia)CSScruise stage separationCSSchannel select synthesizerCTScoaxial transfer switch (also referred to as CXS)CTTcompatibility test trailerCTXContext CameraCWcontinuous wave
Acronyms and AbbreviationsCXScoaxial switch (also referred to as CTS)D-descentD/Adigital to analogDACdigital-to-analog converterDACSdata acquisition and command subsystemDANDynamic albedo of neutrons(instrument to detect and analyze hydrogen in thenear-subsurface of Mars)dBdecibeldBcdB below carrierdB-Hzdecibel-hertzdBidecibel with respect to isotropic gaindBicdecibel with respect to isotropic antennadBmdecibels referenced to milliwattsDCdirect current; steady-state biasDCCdownlink channel controllerDCDdata capture and displayDCOdigital control oscillatorDCPCDownlink Channel Processing CabinetDCTdesign control tableDCTdiscrete cosine transformDDUTdrop-dead uplink timeDEAdigital electronics assemblyDEAdescent engine assemblyDECDual-Engine Centaurdegdegreedelta-DORdelta differential one-way rangingDESCANSODeep Space Communications and Navigation SystemsCenter of ExcellenceDFEdirect-from EarthDGTDeep Space Communications Complex (DSCC)Galileo Telemetry (system)DIDeep Impact525
526Acronyms and AbbreviationsDIXIDeep Impact Extended InvestigationDKFDeep Space Network keyword filesDKTDSN (Deep Space Network) keyword filesDL, D/LdownlinkDLGAdescent LGA (low-gain antenna)DMdata moverDMCDSCC meteorological computerDMDdata monitor and displayDNdata numberDOEDepartment of EnergyDOFFdegrees off (boresight)DOMdistributed object managerDORdifferential one-way rangingDOYday of yearDPDUdigital power distribution unitDPMdigital processing module (in Small Deep SpaceTransponder)DPTdata priority tableDRDiscrepancy ReportDRCFdata-rate capability fileDrvdriveDSdescent stageDS1Deep Space 1DSCCDeep Space Communications ComplexDSDSTdescent stage small deep space transponderDSMSDeep Space Mission SystemsDSNDeep Space NetworkDSSDeep Space StationDSS-1470-m Deep Space Station at Goldstone, CaliforniaDSS-1534-m Deep Space Station at Goldstone, CaliforniaDSS 19Very Large Array (San Agustin, near Socorro, New MexicoDSS-2534-m Deep Space Station at Goldstone, CaliforniaDSS-2634-m Deep Space Station at Goldstone, California
Acronyms and Abbreviations527DSS-3434-m Deep Space Station at Canberra, AustraliaDSS-4226-m Deep Space Station at Canberra, AustraliaDSS-4370-m Deep Space Station at Canberra, AustraliaDSS-4534-m Deep Space Station at Canberra, AustraliaDSS-49Parkes 64-m radio telescope (Parkes, Australia)DSS-5534-m Deep Space Station at Madrid, SpainDSS-6370-m Deep Space Station at Madrid, SpainDSS-6534-m Deep Space Station at Madrid, SpainDTEdirect-to EarthDTFDSN Test FacilityDTRdigital tape recorderDTTDownlink Telemetry and Tracking SubsystemDTTLdata transition tracking loopDTVdigital televisionD-UCTSdescent UHF (ultrahigh frequency) coaxial transfer switchDUHFdescent UHF (ultrahigh frequency) antennaDVCFdata-volume capability fileDXdiplexerEADSCasa Espacio, European Aeronautic Defense and SpaceCompany (HGA vendor)EASengineering analysis subsystemEBMentry balance massEbenergy per command bitEb/N0bit-energy-to-noise spectral-density ratioEASengineering analysis subsystemEBMentry balance massEDAEDL data analysisEDLentry, descent, and landingEFPAentry flight path angleEH&Aengineering health (or housekeeping) and accountability(rate)EH&Aengineering housekeeping, and analysis
528Acronyms and AbbreviationsEIRPeffective isotropic radiated powerELTElectra Lite transponderEMelectromagneticEMCelectromagnetic compatibilityEMIelectromagnetic interferenceEng/HKEngineering/housekeepingEOLend of lifeEOMend of missionEPCelectronic power converterEPOChExtrasolar Planet Observations and CharacterizationEPOXI(combination of two mission names) Extrasolar PlanetObservations and Characterization (EPOCh), and the flyby ofcomet Hartley 2, called the Deep Impact ExtendedInvestigation (DIXI)EPSelectrical power systemERTEarth-received timeEsenergy per telemetry symbolEs /N0symbol energy-to-noise spectral-density ratioESAEuropean Space AgencyESTEastern Standard TimeESTECEuropean Space Administration Research and TechnologyCentreETXexciter transmitterEUengineering unitEUTElectra UHF (ultrahigh frequency) transceivereVelectron voltEVREvent ReportExexciter (provides the radio frequency drive to the transmitter)EXCexciterF1fundamental frequency of the small deep space transponder(SDST)FAflight acceptanceFAflight allowable
Acronyms and Abbreviations529FCDfeedback concatenated decoderFDSflight data subsystemFETfield effect transistorFEMflight-engineering modelFFAfront-end filter assemblyFFTfast Fourier transformFPAfault-protection algorithmFPGAfield programmable gate arrayFROfrequency reference offsetFSFlight SystemFSCfull-spectrum combinerFSKfrequency-shift keyingFSPfull-spectrum processing subsystemFSRfull-spectrum recorderFSSFrame Synchronizer System (subsystem in Voyager)FSSfrequency selective surface (on Voyager S-/X-bandantenna (SXA)FSUfiltering and switch unitFSWflight softwareFTEfull-time equivalentFTSfrequency and timing systemFYfiscal yearGaAsgallium arsenideGbgigabitGBgigabyteGCNGround Communications NetworkGDSGround Data SystemGEMGalileo Europa MissionGDSGoldstone (Deep Space Communications Complex)GDSCCGoldstone Deep Space Communications Complex (DSCC)GFEGovernment furnished equipmentGHzgigahertz
530Acronyms and AbbreviationsGMMGalileo Millennium MissionGMSKGaussian-filtered minimum-shift keyingGNCguidance, navigation, and controlGRACEGravity Recovery and Climate ExperimentGRASPGeneral Reflector Antenna Scatter ProgramGSEground support equipmentGS&Egeneral science and engineeringGSOCGerman Space Operations CenterG/Tratio of antenna gain to noise temperatureGTPgeneralized telecom predictorGUIgraphical user interfaceGWUGeorge Washington UniversityHhydrogenHazcamhazard cameraHCDhardware command decoderHDOhalf-duplex overlayHEFhigh efficiency (antenna)HEMThigh electron mobility transistorHGAhigh-gain antennaHGAGHGA (high-gain antenna) gimbalHGAShigh-gain antenna systemhh:mmhours:minutesHiRISEHigh Resolution Imaging Science ExperimentHKhousekeeperHLANHPhigh-speed LAN (local area network)HPCWhigh-priority comm windowHRSheat rejection system (or subsystem)HSDhigh-speed dataHVPShigh-voltage power supplyHzhertzICAIF (interface) channel assemblyhigh power
Acronyms and Abbreviations531ICDinterface control documentICTinteger cosine transformIDidentificationIDCimage data compressionIDCintermediate frequency to digital converterIDD(MER) instrument deployment deviceIDSIPS (ion-propulsion system ) diagnostic sensorsIEMintegrated-electronics moduleIFintermediate frequencyIMPinterplanetary monitoring platformIMUinertial-measurement unitINDInterplanetary Network Directorate (now IPN-ISD)IPN-ISDInterPlanetary Network and Information Systems Directorate(formerly TDA, TMOD, and INDIPPinter pulse periodIPSion-propulsion systemIRimproved rangingIRinfraredIRISinfrared interferometer spectrometerISisolatorISAIncident, Surprise, Anomaly (report)ISAinterstage adapterISOisolator (at traveling wave tube amplifier output)ISSimaging science subsystemITEimpact through egressIUSInertial Upper StageJIRAMJovian InfraRed Auroral MapperJOIJupiter orbit insertionJPLJet Propulsion LaboratoryJSXJupiter Saturn Explorer (previous name for Voyager 2spacecraft)
532Acronyms and AbbreviationsKkelvinKa-bandfrequencies in the range 26.5–40 GHzKaPAKa-band power amplifierKaTSKa-band Translator Systemkbkilobit(note: telecommunications uses bits [b]; data storage usesbytes [B], which are 8 bits per byte)kbpsthousand(s) of bits per secondkgkilogramKHAKa-band horn antennakmkilometerkm/hrkilometers/per hourkm /skilometers squared per second squaredkNkilonewtonkWkilowattLANlocal-area networkL-bandfrequency range between 390 and 1550 MHzLCinductance capacitance filterLCCDlevel clock conversion distribution (interface)LCPleft-circular polarization; left circularly polarizedLECPlow-energy charged particleLGAlow-gain antennaLGAXLGA (low-gain antenna) directed along the x-axisLGAZLGA (low-gain antenna) directed along the z-axisLGAZ–LGALGA (low-gain antenna) directed along the –z-axisLH 2liquid hydrogenLHleft handLHCPleft-hand circular polarized (or polarization)LMALockheed Martin AerospaceLO 2liquid oxygenLOSloss of signalLoxliquid oxygen2RR2RR
Acronyms and Abbreviations533LPlow powerLMClink monitor and controlLNAlow-noise amplifierLPAlander petal actuator (MER)LPElow-power electronicsLPFlow-pass filterLSTlocal solar timeLTSTlocal true solar timeLVlaunch vehicleLVDSlow-voltage differential signalingmmeterMADMadrid DSCC (Deep Space Communications Complex)MAGmagnetometerMAHLIMars hand lens imager (color microscopic imager)MAQMagellan acquisitionMARCIMars Color Imager (MRO)MARDIMars descent imager (high-resolution color descent imager)Mastcam(multi-spectral, stereo imaging and video camera onMSL mast)Mbitmegabit(note: telecommunications uses bits [b]; data storage usesbytes [B], which are 8 bits per byte)Mbpsmegabit per secondMBRMars Balloon Relay (protocol)MCDmaximum-likelihood convolutional decoderMCD/FSmaximum-likelihood convolutional decoder framesynchronizer (subsystem)MCICmotor controller interface cardMCIFmotor controller interfaceMCSMars Climate Sounder (MRO)MDAmetric data assemblymdegmillidegreeMDNSmission design and navigation subsystem
534Acronyms and AbbreviationsMDSmodulation-demodulation subsystemMDSCCMadrid Deep Space Control Center (DSCC)MECOmain engine cutoffMEDLIMSL EDL instrumentationMEPMars Exploration ProgramMERMars Exploration RoverMER-AMars Exploration Rover “Spirit”MER-BMars Exploration Rover “Opportunity”MESmain engine startMEXMars ExpressMFSMulti-Functional Structure (experiment)MFSK, M-FSK multiple frequency shift keying (tones)MGAmedium-gain antennaMgatemillion gatesMGDSMulti-mission Ground Data SystemMGSMars Global SurveyorMHzmegahertzMICmicrowave integrated circuitMICASminiature integrated-camera spectrometerMIL-71name of Deep Space Network station at Cape Canaveral(not an acronym)MIL-STDMilitary Standard [usually followed by a document number]MITMassachusetts Institute of TechnologyMLEMars landing engineMMmulti missionMOCMars Orbiter CameraMMO(JPL) Mission Management OfficeMMRTGmultimission radioisotope thermoelectric generatorMODmodulationMOIMars orbit insertionMOLAMars Observer laser altimeterMONmonitor systemMOSmission operations system
Acronyms and AbbreviationsMPmodem processorMPamegapascalMPCSmission data processing and control subsystemMPFMars PathfinderMPSTMission Planning and Sequencing TeammradmilliradianMREUMSL remote electronics unit (also called REU)MROMars Reconnaissance OrbiterMROmemory readoutmsmillisecondm/smeter(s) per secondMSmaster of scienceMSAmission-support areaMSAPmulti mission system architecture platformMSATMobile SatelliteMSLMars Science LaboratoryMSLICEMSL InterfaCE (a surface operations visualizationand planning tool)MSPAmultiple spacecraft per apertureMSRMars Sample ReturnMspsmegasymbols per secondMSSSMalin Space Science SystemsMSTmonitor sample timeMTCMars Time coordinatedMTIFMSAP telecommunications interface boardMUKOWMRO uplink keep out windowmWmilliwattNnewtonNasodiumNAIFNavigation and Ancillary Information FacilityNASANational Aeronautics and Space AdministrationNAVnavigation535
536Acronyms and AbbreviationsNCOnumerically controlled oscillatorNISNNASA Integrated Services NetworkNMCNetwork Monitor and ControlNMPNew Millennium ProgramNOCC RTNetwork Operations Control Center real time (System)NOPnetwork operations planNPONPO Energomash (Russian manufacturer)NPPNetwork Planning and Preparation systemnradnanoradiansNRAONational Radio Astronomy ObservatoryNRZnon-return to zeronsnanosecondNSPNetwork Simplification ProjectNVMnonvolatile memoryNVMnonvolatile memory/cameraNVM/CAMnonvolatile memory/cameraOCMorganic check materialODorbit determinationODBoperational databaseODYOdysseyONCOptical Navigation Camera Experiment (MRO)ORSCorbiter relay state changeOscoscillatorOWLTone-way light timeP-parachutePASMpower actuation and switching modulePccarrier powerPCMpulse code modulationPc/N0carrier power to noise-spectral-density ratioPDpassive device (in solid state power amplifier,a microwave coupler or combiner)
Acronyms and AbbreviationsPDFPortable Document FormatPd /N0data power-to-noise spectral-density ratioPDSPlanetary Data System (label)PDUprotocol data unitPEDLpre-entry, descent, and landingPEPEPlasma Experiment for Planetary ExplorationP-fileprediction fileP/FRProblem/Failure ReportPhDdoctor of philosophyPIprincipal investigatorPLARPost-Launch Assessment ReviewPLFpayload fairingPLGAParachute Low-Gain Antenna (MSL, chapter 8)PLGAPetal Low-Gain Antenna (MER, chapter 7)PLLphase-locked loopPLSplasma sciencePMpost meridianPMAPancam Mast Assembly (MER)PMPpayload mounting modulePNpseudonoisePolpolarizerPORpower-on resetPPIPlanetary Plasma Interactionsppmparts per millionPPSphotopolarimeter systemPrdownlink ranging powerPRAplanetary radio astronomyPr/N0ranging power-to-noise spectral-density ratioProx-1Proximity-1 protocolPR/TSAproject requirements/TMOD [Telecommunications andMission Operations Directorate (now called IPN-ISD)]support agreementpsfpounds per square foot537
538Acronyms and AbbreviationsPSMpower supply module (MRO)PSSparachute support structurePt/N0quantity downlinkPt /N0total power-to-noise spectral-density ratioPtonepower in differential one-way ranging (DOR) tonePUHFparachute UHF (ultrahigh frequency) antennaPWSplasma wave spectrometer (Galileo)PWSplasma wave systemQPSKquadrature phase-shift keyingR-roverRAARrelay antenna assembly receiveRAATrelay antenna assembly transmitradradian (57.3 degrees)RADradiation assessment detectorRADRocket-Assisted Deceleration (system in MER)RAMProver avionics mounting plateRATrock abrasion toolRCradar controllerRCrequest commandRAXRemote-Agent ExperimentRCradar controllerRCCreceiver control computerRCErover computer elementRCPreceiver channel processorRCPright-circular polarization; right-circularly polarizedRCSreaction control systemRCVRreceiverREDRover Equipment Deck (MER)Reffeffective information rateREMrover electronics module
Acronyms and Abbreviations539REMSRover environmental monitoring station (instrument tomeasure meteorological conditions and ultraviolet near therover)REUremote electronics unit (also called MREU for MSL remoteelectronics unit)RFradio frequencyRFM(ultrahigh frequency, UHF) radio frequency module (MRO)RFPDUradio frequency power distribution unitRFSradio frequency subsystemRFSTLCradio frequency subsystem tracking-loop capacitorRHright handRHCPright-hand circular polarized (or polarization)RIDradio-frequency to intermediate-frequency downconverterRjJupiter radiiRLANreceiver local area network (LAN)RLGARover low-gain antennaRMranging maximumrngrangingRNSReliable Network ServiceRPradar processorRProcket propellant or refined petroleum (kerosene)RPAMrover power and analog moduleRPDURF (radio frequency) power distribution unit (in TDS)RPFArover pyro fire assemblyrpmrevolutions per minuteRRArelay receiving [or radio] antennaRRHrelay radio hardwareRRHrelay receiving hardwareRRPreceiver and ranging processorRSReed-Solomon (code)RSDLRS (Reed-Solomon) downlinkRSDSRaw Science Data ServerRSDSTRover Small Deep Space Transponder
540Acronyms and AbbreviationsRSMremote sensing mastRSRradio science receiverRTremote terminalR/Treceive/transmitRTGradioisotope thermoelectric generatorRTLTround-trip light timeRTNreturnrurange unitR-UCTSrover UHF (ultrahigh frequency) coax transfer switchRUHFrover UHF (ultrahigh frequency) antennaR-WTSrover waveguide transfer switchRxreceiveSAsample acquisitionSAICScience Applications International CorporationS&Lstandards and limitsSAMsample analysis at Mars(instrument for chemical and isotopic analysis ofacquired samples)SAMPEXSolar Anomalous and Magnetospheric Particle EXplorerS-bandRF frequencies 2 to 4 GHz for spacecraft in the deep spacefrequency bands, S-band refers to an uplink frequency ofabout 2115 MHz and a downlink frequency of about2295 MHz)S/CspacecraftSCaNSpace Communications and Navigation (Office)SCARLETSolar Concentrator Array Using Refractive Linear ElementTechnology (Deep Space 1)SCETspacecraft event timeSCIDspacecraft identifierSCMFspacecraft command message fileSDRsoftware defined radioSDSTSmall Deep-Space TransponderSECSingle-Engine Centaur
Acronyms and Abbreviations541SECSun–Earth–Craft (angle)S–E–CSun–Earth–Craft (angle)SEPseparationSEPsolar-electric propulsion (technology)S–E–PSun-Earth-probe (angle)SeqGensequence generation (spacecraft activity planning software)S-EXCS-band exciterSFOCSpace Flight Operations CenterSFOSspaceflight operations scheduleSHARADShallow (Subsurface) Radar (MRO)sigmaspelled out form of Greek character, σ (for 1 standarddeviation)SIMSpace Interferometry Mission (proposed space radiotelescope; the program was cancelled in 2010)SITselect in testSLC-17ASpace Launch Complex 17ASLESpace Link ExtensionSMAPSoil Moisture Active & Passive Mapping (satellite)SMMspacecraft mode managerSNRsignal-to-noise ratioSNTsystem-noise temperatureSOASscience operations analysis subsystemSOCstate of chargeSOEsequence of eventssolMartian daySOWGScience Operations Working GroupSPservice packageSPaHsample preparation and handlingSPARCscalable processor architectureSPCSignal Processing CenterSPDS-band polarization diversitySPEstatic phase errorSPESun–Probe–Earth (angle)
542Acronyms and AbbreviationsSPIESociety of Photo-Optical Instrumentation Engineersspssymbols per secondSRsweep rangeSRAsequential ranging assemblySRBsolid rocket boosterSRBJsolid rocket booster jettisonS-RCVRS-band receiverSRMsolid rocket motorSRUstellar-reference unitSSAsolid state amplifierSSASun-sensor assembly (Deep Space 1)SSDsymbol stream distributionSSIsolid state imagingSSKsoft symbol controllerSSNRsymbol signal-to-noise ratioSSPAsolid state power amplifierSSRsolid-state recorderSTDNNASA Spaceflight Tracking and Data NetworkSTEsystem test equipmentST/N0ratio to product of power in data sidebands (S) and bitduration (T) to noise spectral density; equivalent to Eb /N0STSSpace Transportation SystemSTS-34Space Transpiration System 34 (Shuttle Atlantis)S-TWTAS-band traveling-wave tube amplifierSUFRstraighten up and fly rightSUPAEROÉcole nationale supérieure de l’aéronautique et de l’espaceSXAS- and X-band antennasyncsynchronizationTBOTtelecom at beginning of tracksTCtransmit commandTCAtelemetry channel assembly (Voyager)TCMtrajectory correction maneuver
Acronyms and Abbreviations543T cyccycle timeTDATelecommunications and Data Acquisition (previous namefor Deep Space Network)TDDSTracking Data Delivery SubsystemTDLtelecom development labTDMtime-division multiplexingTDRSSTracking and Data Relay Satellite SystemTDSterminal descent sensorTDSATDS (terminal descent sensor) antenna arrayTDSDTDS (terminal descent sensor) digital stackTDSRTDS (terminal descent sensor) radio frequency stackTEOTtelecom at end of tracksTFPtelecom forecaster predictorTFREQultrastable oscillator (USO) frequency update messages foruse in tracking operationsTIPtarget interface pointTIRSTransverse Impulse Rocket System (in MER)TLGAtilted low-gain antennatlmtelemetryTLMtelemetry systemTLMGENtelemetry-rate generatorTLPtelemetry processorTMODTelecommunications and Mission Operations Directorate(now called IPN-ISD)TMUtelemetry modulation unitTOASTTelecom Orbit Analysis and Simulation ToolT/Rtransmit/receive; transmitter/receiverTRKtracking systemTRMtransmit/receive moduleTSBtelecom support boardTTEturn to entryTTStest and telemetry systemTWtruth windowRR
544Acronyms and AbbreviationsT/Wratio of thrust and weight on padTWNCtwo-way noncoherent (mode, TWNC-on and TWNC-off)TWTAtraveling-wave tube amplifierTxtransmit (or transmitter)UAUniversity of ArizonaUCTSUHF (ultrahigh frequency) coax transfer switchUCXSUHF (ultrahigh frequency) coaxial transfer switchUDIMup/down IF (intermediate frequency) moduleUDMMup down MIC [microwave integrated circuit] moduleUHFultra-high frequencyUL, U/LuplinkULDLuplink–downlinkUPAuplink processor assemblyUPLUplink SubsystemURAuplink ranging assemblyUSAUnited States of AmericaUSNUniversal Space NetworkUSOultrastable oscillatorUTCUniversal Time Coordinated(also known as Greenwich Mean Time)UTCSUHF transceiver coaxial switchUVultravioletUVSultraviolet spectrometerVCOvoltage-controlled oscillatorVCXOvoltage-controlled crystal oscillator (list only one)VDCvolts direct currentVEEGAVenus-Earth-Earth gravity assistVGAvariable gain amplifierVGRVoyagerVIMVoyager Interstellar MissionVLAVery Large Array (San Agustin, near Socorro, New Mexico)
Acronyms and Abbreviations545VLBIvery long baseline interferometryVSRvery long baseline interferometry (VLBI) science receiverVSWRvoltage standing wave ratioWwattW2CXwaveguide to coaxialWEBwarm electronics boxWGwaveguideWhrwatt-hourWINDfull name (not an acronym) of a spacecraft studying nearEarth solar windWIPL-DWires, Plates, Dielectrics (a commercial high frequencyelectromagnetic modeling software package)WTSwaveguide transfer switchX-bandradio frequencies from 7 to 12.5 GHz (for spacecraft in thedeep space frequency bands, X-band refers to a downlinkfrequency of about 8415 MHz)X-EXCX-band exciterXFMRtransformerXPAX-band power amplifierXSDCX- to S-band downconverterX-TWTAX-band traveling-wave tube amplifierXTRX-band transmit receive
546Acronyms and Abbreviations
Acronyms and Abbreviations AACS attitude and articulation control subsystem ABM aerobraking maneuver ABX aerobraking exit Ac acquisition (also ACQ) ACE Advanced Composition Explorer ACE call sign for project real-time mission controller ACIS antenna control and interface subsystem ACK acknowledgm
Acronyms & Abbreviations 1 page . Acronyms and Abbreviations. List of Acronyms and Abbreviations % percent %g Percent acceleration of gravity C degrees Celsius . NCDC NOAA's National Climatic Data Center NEHRP . National Earthquake Hazard Reduction Program . NEPA National Environmental Policy Act NESEC .
6 7/26/2000 1 – Abbreviations, Acronyms and Definitions Chapter 1 – Abbreviations, Acronyms and Definitions Abbreviations and Acronyms ACCA – Air Conditioning Contractors of America. AFUE – Annual fuel utilization efficiency. ARI – Air-Conditioning and Refrig
The use of abbreviations and acronyms in medical records and reports may lead to errors in patient care as they may be misunderstood or misinterpreted. When acronyms and abbreviations are used, they should always be defined within the records, report etc. in which they appear, thus: “Mr. Jones has suffered a cerebrovascular accident (CVA). .
COMMONLY USED ACRONYMS If you interact with Medicare, you probably encounter acronyms on a regular basis. It can be difficult sometimes to keep track of them all. This resource is a list of Medicare-related acronyms. While the list is not all-inclusive, it contains those acronyms you may encounter on a regular basis in the course of your
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17. Acronyms and Abbreviations 733 BLS. . . . . . . . . .Bureau.of.Labor.Statistics BMI. . . . . . . . . .Bismaleimide BOGS. . . . . . . .Blade.Outer.Gas.Seal
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