Cassini Acronyms
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

--A--

AACSAttitude and Articulation Control Subsystem
ABApproved By
ACAlternating Current
ACCAccelerometer
ACCEAccelerometer Electronics
ACCHAccelerometer Head
ACEAttitude Control Electronics
ACHAccelerometer Head
ACIAccelerometer Interface
ACPAerosol Collector and Pyrolyzer
ACTActuator
ADApplicable Document
A/DAnalog-to-Digital
ADCAnalog-to-Digital Converter
ADPAutomatic Data Processing
AFUS Air Force
AFCAACS Flight Computer
AFETRAir Force Eastern Test Range
AFETRMAir Force Eastern Test Range Manual
AFTAbbreviated Functional Test
AFTAllowable Flight Temperature
AGCAutomatic Gain Control
AHSEAssembly, Handling, & Support Equipment
AISAutomated Information System
AITAssembly, Integration & Test
AIVAssembly, Integration & Verification
ALAluminum
ALAgreement Letter
ALAnomalously Large
ALAPAs Low As Practical
ALARAAs Low As Reasonably Achievable
ALDAssistant Laboratory Director
ALFAssisted Load Format
ALTNadir Looking Altimeter, A RADAR mode
AMAmericium
AMMOSAdvanced Multimission Operations System
AMOAir Mass Zero
AMTECAlkali Metal Thermoelectric Converter
AntAntenna
ANTAntenna Subsystem
AOAnnouncement of Opportunity
APAction Program
APActivity Plan
APAuxiliary Propulsion
APGENActivity Plan Generator
APIDApplication Processing Identification
APLApproved Parts List
APNAdministrative Practices Notebook
APPAutomated Picture Planning
APSAirborne Purge Subsystem
APSAAdvanced Photovoltaic Solar Array
AQSAcquisition Sun Sensor
ARCAmes Research Centerr
ARIAAdvanced Range Instrumentation Aircraft
ARWMArticlated Reaction Wheel Mechanism
ASCII American Standard Character Code for Information Exchange
ASEAirborne Support Equipment
ASIAgenzia Spaziale Italiana (Italian Space Agency)
ASIAtmospheric Structure Instrument
ASICApplication-Specific Integrated Circuit
ASMEAmerican Society of Mechanical Engineers
AssyAssembly
ASTMAmerican Society for Testing and Materials
ATDFArchival Tracking Data File
ATLOAssembly, Test and Launch Operations
ATPAcceptance Test Procedure (or Plan)
AUAstronomical Unit
AUX, OSCAuxiliary oscillator
AWGAmerican Wire Gauge
AzAzimuth

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--B--

BBillions
BaBarium
BABus Adapter
BAILBackup ALF Injection Loader
BBBasebody
BCBus Controller
BCABattery Control Assembly
BCEBench Checkout Equipment
BCRTMBus Controller, Remote Terminal, Monitor
BCSSBack Cover Subsystem
BDBurst Disc
BERBit Error Rate
BIHBureau International de 1'Heure
BITBuilt-In Test
BIUBus Interface Unit
BOBBreakout Box
BOLBeginning of Life
BOMBeginning of Mission
BPFBand Pass Filter
BPLVBipropellant Latch Valve
BPLVDBipropellant Latch Valve Driver
BPSBits Per Second
BRFBand Reject Filter
B/SBoresight
BTABipropellant Tank Assembly
BTKBlock for Transfer and Correction
BTUBritish Thermal Unit

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--C--

C3 Trajectory Energy parameter = twice the injection energy per unit mass = V2?I
CAChemical Analyzer
C/AClosest Approach
CABLCabling Subsystem
CAEComputer Aided Engineering
CALCalibrated
CaltechCalifornia Institute of Technology
CAMCollision Avoidance Maneuver
CAPSCassini Plasma Spectrometer Subsystem
CAPTRANMacro Validation Tool
CARCommand Ambiguity Resolver
CASCassini
CASEComputer Aided Software Engineering
CATChemical Analyzer Target
CATSCassini AACS Test Station
CBConcurred By
CBECurrent Best Estimate
CBHCatalyst Bed Heater
CBLCabling
C/CCRAF/Cassini
CCCargo Container
CCAChange Control Authority
CCICassini Critical Item
CCAFSCape Canaveral Air Force Station
C/CAMCollision and Contamination Avoidance Maneuver
CCBChange Control Board
CCBConfiguration Control Board
CCDChange Coupled Device (Visible Focal Plane Array)
CCDSCharge Coupled Device Standards
CCECamera Control Electronics
CCLChannel Conversation Language
CCPOCCCRAF/Cassini Payload Operations Control Center
CCSDSConsultative Committee for Space Data Systems
CCTCentral Communications Terminal
CDACosmic Dust Analyzer Subsystem
CDBCentral Data Base
CDFCommon Data Format
CDLCommand Data Languatge
CDMSCommand & Data Management System (Probe)
CDRChannel Data Record
CDRCritical Design Review
CDROMCompact Disc Read Only Memory
CDSCircuit Data Sheet
CDSCommand & Data Subsystem
CDSCCCanberra Deep Space Communications Complex
CDSSCommand & Data Subsystem Simulator
CDS-SECommand & Data Subsystem Suport Equipment
CDUCommand Demodulation Unit
CDUCommand Detector Unit (Part of RFS)
CECognizant Engineer
CECritical Enable
CEACIRS Electronics Assembly
CELVComplementary Expendable Launch Vehicle
CEMChannel Electron Multiplier
CEQCouncil on Environmental Quality
CEUCentral Electronics Unit
CGCenter of Gravity
CGSCassini Ground System (at JPL)
CHACamera Head Assembly
CHDOCompressed Header Data Object
CHEMSCharge-Energy-Mass Spectrometer (Part of MIMI)
CHPIPCassini/Huygens Project Implmentation Plan
CIConfiguration Item
CIDEXCometary Ice and Dust experiment
CIRSCassini Infrared Spectrometer
CIRSComposite Infrared Spectrometer
CIRSComposite Infrared Spectrometer Subsystem
CISOComputing and Information Services Office (JPL)
CITCalifornia Institute of Technology
CIUControl Interface Unit
CK (C-Kernel)Instrument pointing information in the NAIF SPICE system (after Camera Channel Parameter Table)
CKTCircuit
CLCommunication Line
CLCWCommand Link Control Work
CLTUCommand Link Transfer Unit
CMCenter of Mass
CMConfiguration Management
Cm-244Curium-244
CMDCommand
CMOSComplementary Metal Oxide Semiconductor
CMPConfiguration Management Plan
CNESCentre National d'Etudes Spatiales (France)
CoCobalt
C/OCheck Out
Cog ECognizant Engineer
CO-ICo-Investigator
COMACometary Matter Analyzer
Comm SvcCommunication Services
COMPAREFile Comparison Software
COMPLEXCommittee on Planetary and Lunar Exploration
ConfConfirmation
COPCommand Operation Procedure
COSCommon Operating System
CosCosine
CPCassini Project
CPCCompound Parabolic Concentrator
CPCIComputer Program Configuration Item
CPFCommand Packet File
CPTChannel Parameter Table
CPUCentral Processor Unit
CRConcentration Ratio
CRAFComet Rendezvous/Asteroid Flyby
CRCCritical Controller
CRCCritical Register Control
CREWECoordinated Radio Electron and Waves Experiment
CRIMSCometary Retarding Ion Mass Spectrometer
CSACharge Sensitive Amplifer
CSCIComputer Software Configuration Item
CSECassini Security Engineer
CSOCConsolidated Space Operations Contract
CSRRDCross-Systems Requirements Reference Document
CSSCoarse Sun Sensor
CTA(-21)DSN Compatibility Test Area
CTRCognizant Technical Representative
CTSCommunications Technology Satellite
CUControl Unit
CVControl Voltage
CWConstant (or continuous) Wave

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--D--

DADirect Access
DADouble Amplitude
DADust Analyzer (from CDA)
DARADeutsche Agentur Für Raumfahrtangelegenheiten
DASIACDefense Atomic Support Information Analysis Center
DAUDirect Access Unit
DBData Buffer
dBDecibel
DBAData Bus Adapter
dBcdB referenced to a carrier
dBcDecibels below carrier
DBMSData Base Management System
DCDirect Current
D(CDS) Deferred CDS capability (software capability awaiting either an ECR or a post-launch implementation)
DCNDocument Change Notice
DCSData and Computing Services
D&CSData and Computing Services
DCSSDescent Control System
DDADual Drive Actuator
DDEDisplacement Damage Effect
DDORDelta Differential One-Way Ranging
DEFDisplacement equivalent Fluence
Delta-VVelocity Increment (change in S/C velocity)
DESATSReaction Wheel Desaturation
DEVMechanical Devices Subsystem
DEVNETDevelopement Network
DFDissipation Factor
DFPWDownlink Fields Particles and Waves
DFTSDual-Fault-Tolerant Switch
DIDielectrically Isolated
DIFPDifferential Ion Flux Probe
DIPSDynamic Isotope Power System
DISRDescent Imager/Spectral Radiometer
DivDivision
DLDownlink
D/LDownlink
DLIBDocument Library (JPL)
DMADirect Memory Access
DMDData Monitor and Display
DMRDetailed Mission Requirements
DMWFDesired Memory Word File
DNData Number
DNDigital Number
DODistributed Operations
DODDepth of Discharge
DODDifferential One-Way Doppler
DoDU.S. Department of Defense
DoEU.S. Department of Energy
DOIDistributed Operations Interface
DOMDistributed Operations Manager
DOMDistributed Object Manager
DOPDioctylpthalate
DORDifferenced One-way Ranging
DOTDepartment of Transportation
DPDirect Program
DPData Processing
DPADestructive Physical Analysis
DPADipole Assembly
DPIData Processing Installation
DPTRAJDouble Precision Trajectory
DPUData Processing Unit
DRData Record
DRDiscrepancy Report
DRDData Requirements Description
DRVIDDifferenced Range Versus Integrated Doppler
DSADevelopment Support Area
DSADigital Synchronization Assembly
DSCCDeep Space Communication Complex
DSMDeep Space Maneuver
DSNDeep Space Network
DSNOTDeep Space Network Operations Team
DSOTData Systems Operations Team
DSPDual Shearplate
DSSDeep Space Station
DSSDigital Assembly
DSSDigital Subsystem
DSTDeep Space Transponder (Part of RFS)
DTMDevelopmental Digital Test Model
DTMDynamics Test Model
DTRDigital Tape Recorder
DTSDead Time Start
DTSTARTDead Time Start
DUTDevice Under Test
DVVelocity Increment (change in S/C velocity)
DV-EGADelta-V-Earth Gravity Assist (a trajectory type)
DWEDoppler Wind Experiment
DWGDiscipline Working Group
DWGCDiscipline Working Group Chairperson
DXDiplexer

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--E--

EAActivation Energy
EAROMElectronically Alterable Read Only Memory
EBSEGSE Basic Software
ECARSElectronic CAPS Activity Request System
ECIEngineering Change Instruction
ECMEngineering Change Management
ECOEngineering Change Office
ECREngineering Change Request
EDACError Detection and Correction
EDFEngineering Data File
EDFExperiment Data File
EDMGEngineering Data Management Group
EDMSEngineering Data Management System
EDRExperiment Data Record
EDTEngineering Flight Computer Diagnostic Tester
EEDElectro Explosive Device
EEEElectronic, Electrical & Electromechanical
EEISEnd-to-End Information System
EFCEngineering Flight Computers
EFCSEEngineering Flight Computer Support Equipment
EFLEffective Focal Length
EFPExplosively Formed Projectile
EGAEarth Gravity Assist
EGAEngine Gimbal Actuator
EGEEngine Gimbal Electronics
EGSEElectrical Ground Support Equipment
EEISEnd-to-End Information System
EFCEngineering Flight Computer
EFCSEEngineering Flight Computer Support Equipment
EFLEffective Focal Length
EFPExplosively Formed Projectile
EGAEngine Gimbal Actuator
EGEEngine Gimbal Electronics
EGAPEngine Gimbal Actuator P
EGSEProbe Electrical Ground Support Equipment
EICDElectrical Interface Control Drawing
EIDExperiment Interface Document
EIFOVEffective Instantaneous Field of View
EIPExperiment Implementation Plan
EISEnvironmental Impact Statement
EISSSEnvironmental Impact Statement Supporting Studies
EJGAEarth Jupiter Gravity Assist
EK (E-Kernel)Log of Events and notes in the NAIF SPICE system
ElElevation
ELMElectronic Mail
ELSEastern Launch Site (includes CCAFS and KSC)
ELSElecton Spectrometer (Part of CAPS)
ELVExpendable Launch Vehicle
EMElectromagnetic
EMEngineering Model
EMCElectromagnetic Compatibility
EMFElectromagnetic Force
EMIElectromagnetic Interference
EMI/RFI Electromagnetic Interference/Radio Frequency Interference
EMTBEngineering Model Test Bed
ENAEnable
ENAEnergetic Neutral Analyzer
ENAEnergetic Neutral Atom
EngrEngineering
EOLEnd-of-Life
EOLEnd-of-Life effect
EOMEnd of Mission
EOPEnd of Project
EOS-AMEarth Observing System-Morning
EPCElectronic Power Conditioner
EPDEnergetic Particle Detector
EPDCElectrical Power Distribution Circultry
EPP & RD Environmental Program Policy and Requirements Document
EPSEarth-Probe-Sun
EPSElectronics Packaging Subsystem
EPSSElectrical Power Subsystem
E/qEnergy Per Unit Charge
EREastern Range (KSC & CCAFS)
EREEnvironmental Requirements Engineer
ERTEarth Received Time
ESAEuropean Space Agency
ESAExplosive Safe Area
ESDElectrostatic Discharge
ESDU Engineering Flight Computer Software Developmental Unit
ESMCUSAF Eastern Space and Missile Center
ESMCREastern Space and Missile Center Regulation
ESOCESA Space Operations Center
ESREffective Series Resistance
ESSEnergy Storage Assembly (part of RADAR)
ESSEnergy Storage Subsystem (part of RADAR)
ESTECEuropean Space Research and Technology Center
ETAEnvironmental Test Authorization
ETAFEnvironmental Test Authorization Form
ETLEnvironmental Test Labs
ETMElement Technical Manager
ETREastern Test Range
ETREquivalent Time Ratio
ETSSEnvironmental Test Specification Summary
EUEngineering Unit (part of CDS)
EUSEnergia Upper Stage
EUVExtreme Ultraviolet
EUVExtreme Ultra Violet Channel (part of UVIS)
EVAExtra Vehicular Activity
EVEEGAEarth-Venus-Earth-Earth Gravity Assist
ExtExternal

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--F--

F2Fluorine
FAFlight Acceptance
FAFormal Agreement
FabFabrication
FACFacility
FARFlight Acceptance Review
FARMFrame Acceptance and Reporting Mechanism
FASTSIMHigh-speed Simulator
FCFaraday Cage
FCBFacility Control Building
FDDFunctional Design Document
FDSFine Digital Sun Sensor
FEMFinite Element Model
FENField-Equivalent-Noise
FEOTFacility Experiment Operations Team
FETField Effect Transistor
FFTFast Fourier Transform
FGMFlux Gate Magnetometer
FGMVector Fluxgate Magnetometer
FHFilter Hybrid
FHDFFlight Hardware Development Facility
FIFacility Instrument
FIFOFirst In / First Out (data memory)
FIMFacility Instrument Manager
FIRFar Infrared
FIRDRFinal Interface Requirements and Design Review
FISFlight Instrument System
FISTFacility Instrument Science Team
FITFlight Investigation Team
FltFlight
FLT-SPFlight-Spare
FMFlight Model
FMFrequency Modulation
FMEAFailure Mode Effects Analysis
FMECAFailure Mode Effects & Criticality Analsysis
FMHFree Molecular Heating
FOFlight Observable
FOMFigure of Merit
FOPFlight Operations Plan
FORSFiber Optic Rotation Sensor
FOSFactor of Safety
FOVField of View (instrument)
FPFault Protection
FPFlight Project
FPFocal Plane
FPAFocal Plane Array
FPAFocal Plane Assembly
FPGAField Programmable Gate Array
FPOJPL Flight Projects Office
FPPFields and Particles Pallet
FPPFlight Project Practice
FPRFlight Performance Reserve
FPSG & RFlight Projects Safety Guide and Requirements
FPSOFlight Project Support Office
FPWFields, Particles, and Waves
FPWIFields/Particles/Waves, INMS
FRFailure Report
FRFunctional Requirements
FRDFunctional Requirement(s) Document
FRGFederal Republic of Germany
FRRFunctional Readiness Review
FRSSFront Shield Subsystem
FSFlight System
FSARFinal Safety Analysis Report
FSDSFlight Software Development System
FSOFlight System Operations
FSTFacility Science Team
FSTBFlight Software Test Bed
FSWFlight Software
FTAFault Tree Analysis
FTEFull Time Equivalent
FTPFile Transfer Protocol
FTSFlight Termination System
FTSFourier Transform Spectrometers
FUVFar Ultraviolet
F/WFirmware
FWMHFull Width at Half Maximum
FYFiscal Year

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--G--

GaAsGallium Arsenide
GCFGround Communications Facility
GCMDGround Command File
GCMSGas Chromatograph and Mass Spectrometer
gdGadolinium
GDDGeneral Design Document
GDSGround Data System
GDSCCGoldstone Deep Space Communications Complex
GDSEGround Data System Engineer
GeGermanium
GFEGovernment(or JPL) Furnished Equipment
GFPGovernment Furnished Property
GHEGaseous Helium
GHzGaseous Nitrogen
GHzGigahertz
GIFGCF Interface (Subsystems)
GL & CsGuidelines and Constraints
GLLGalileo
GMTGreenwich Mean Time
GN2Gaseous Nitrogen
GPHSGeneral Purpose Heat Source
GPIBGeneral Purpose Interface Bus
GPSGlobal Positioning System
GRSGamma Ray Spectrometer
GSGround System
GSCCBGround System Change Control Board
GSDMGround System Development Manager
GSEGovernment Supplied Equipment
GSEGround Support Equipment
GSFCGoddard Space Flight Center
GSOGeo-Stationary Orbit
GSOMGround System Operations Manager
GSRRGround System Readiness Review
GSSEGround Software System Engineer
GSWGround Software

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--H--

hHexadecimal
HASIHuygens Atmospheric Structure Instrument
HCDHardware Command Decoder
HCPHardware Command Program
HCSHigh Speed CMOS (silicon on sapphire)
HDACHydrogen/Deuterium Absorption Cell
HDBHuygens Data Base
HeHelium
HEFHigh-Efficiency
HEFHigh-Eficiency DSN Station
HELVHelium Latch Valve
HeLVD Helium Latch Valve Driver
HEOHigh Earth Orbit
HEXFET Hexagonal Field Effect Transistor (Trademark of International Rectifier)
hFETransistor dc gain
HGAHigh-Gain Antenna
HKHousekeeping
HKHousekeeping Data (instrument engineering key parameters)
HLHigh Level
HMCSHuygens Monitor and Control System
HOLHigh Order Language
HPHewlett-Packard
HPHigh Pressure
HPDHot Plasma Detector
HPFHazardous Processing Facility
HPLVHigh Pressure Latch Valve
HPOCHuygens Probe Operations Center (at ESOC)
HPSPHigh Precision Scan Platform
HQHeadquarters
HRCRHardware Requirements and Certification Review
HRDHigh Rate Detector
HSKHouskeeping
H-S SIMHigh-speed Simulator
HSPHigh Speed Photometer
HSRHardware Safety Review
HSWTHuygens Science Working Team (Titan Probe)
HTAHelium Tank Assembly
HTRHeater
HUYHuygens Probe
HVHigh Voltage
HVHigh Voltage Power Converter
HVPSHigh Voltage Power Supply
HVUHigh Voltage Unit
HWHardware
H/WHardware
HzHertz

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--I--

IAAInter-Agency Agreement
IA/LPIon Analyzer/Langmuir Probe
IBSIon Beam Spectrometer (Part of CAPS)
ICImperial College
ICInstrument Coordinator
ICIntegrated Circuit
ICInternal Combustion
ICAInventory Change Authorization
ICCBInterface Change Control Board
ICDInterface Control Document
ICDInterface Control Drawing
ICDSInterface Circuit Data Sheet
ICRInstrument Confirmation Review
ICVInter-Center Vector
IDInterface Document
IDRIntermediate Data Record
IDRSPSIntermediate Data Records Stripper Processing System
IDSInterdisciplinary Scientist (or Science)
IDSRD Investigation Description & Science Requirements Document
IDSTInstrument Development Science Team
IDT Instrument Development Team (for facility instruments)
IDTLInstrument Development Team Leader
IEInstrument Engineer
IEBInstrument Expanded Block
IESDInternal Electrostatic Discharge
I/FInterface
IFMInterface Module
IFOVInstantaneous Field of View
IFRBInterface Failure Review Board
IK'I' Kernel (Instrument Information in the NAIF SPICE system)
ILANInstutional Local Area Network
IMInjection Margin
IMPInterface Management Plan
IMSIon Mass Spectrometer (Part of CAPS)
INCAIon and Neutral Camera (Part of MIMI)
INDIndication
INMSIon and Neutral Mass Spectrometer
INMSIon and Neutral Mass Spectrometer Subsystem
InSBIndium Antinomide
InstrInstrument
IntIntegration
INUInertial Navigation Unit (Centaur)
I/OInput/Output
IOInstrument Office
IOMInteroffice Memorandum
I/PInput
IPImplementation Plan
IPSDInterface Planning and Scheduling Document
IRInfrared
IRDInterface Requirements Document
IREInertial Reference Electronics
IRIIneertial Reference Interface
IRUInertial Reference Unit
ISInvestigation Scientist
ISAIncident Surprise Anomaly Report
ISBIntra System Bus
ISFDIntegrated Software Functional Design
ISFDIntegrated Software Functional Diagram
ISFRDInstrument System Functional Requirements Document
ISLRIntegrated Sidelobe Ratio
ISOEIntegrated Sequence of Events
ISPSpecific Impulse (in seconds)
ISSImaging Science Subsystem
ISS NACImaging Science Subsystem, Narrow Angle Camera
ISS WACImaging Science Subsystem, Wide Angle Camera
ISTImaging Science Team
ISTInstitutional Support Team
ISTIntegrated System Test
ISTSInner Structure Subsystem
ITIntegrated Timeline
I&TIntegration and Test
ITLIntegration Test Laboratory
ITOIndium Tin Oxide
IUSInertial Upper Stage
IVPInertial Vector Propagator

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--J--

JFETJunction Field Effect Transistor
JGAJupiter Gravity Assist
JPLJet Propulsion Laboratory
JSCJohnson Space Center
JSWGJoint Science Working Group
JWGJoint Working Group

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--K--

KBoltzmann's constant
Ka=La-Band Uplink
Ka-BandRadio frequencies beween 26 and 40 GHz
KaOKa-Band Downlink
KAT, Ka-TrKa-Band Transiator
Ka-TWTAKa-Band Traveling Wave Tube Amplifier
KEX, Ka-EXKa Band Exciter
kHzKilohertz
KPTKinematics Prediction Tool
KSCKennedy Space Center

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--L--

LLaunch
LALaunch Approval
LANLocal Area Network
LANLLos Alamos National Laboratory
LASPLaboratory for Atmospheric and Space Physics
LCELaunch Complex Equipment (A Voyager Science Instrument)
LCPLeft Circular Polarization
LCPLeft-Hand Circularly Polarized
LECP Low Energy Charge Particle Subsystem (A Voyager Science Instrument)
LEDLight-emitting diode
LEMLower Equipment Model
LEMMS Low Energy Magnetospheric Measurement Subsystem (Part of MIMI)
LEOLow Earth Orbit
LeRCLewis Research Center
LETLinear Energy Transfer
LFELow Frequency Electronics
LFHLow Frequency Magnetic
LF&SLaunch Facilities and Support
LGALow Gain Antenna
LGA1Low Gain Antenna-1
LGA 1Low Gain Antenna 1
LHCPLeft Hand Circular Polarization
LILTLow Intensity, Low Tempeature
LNALow Noise Amplifier
LOLocal Oscillator
LPLangmuir Probe
LPLVLow Pressure Latch Valve
LPPPLow Precision Pointing Platform
LRDLightning and Radio Emission Detector
LRRLaunch Readiness Review
LSALinear Seperation Assembly
LSBLeast Significant Bit
LSILarge Scale Intgrated (electronics chip)
LSWLeast Significant Word
LTLLaser Time Line
LTSLaboratory Test Set
LVLatch Valve
LVLaunch Vehicle
L/VLaunch Vehicle
LVALaunch Vehicle Adapter
LVCLaunch Vehicle Contingency Reserve
LVDTLinear Variable Differential Transformer
LVMPLaunch Vehicle Mission Peculiar
LVPSLow Voltage Power Supply
LVSLaunch Vehicle System
LWRHULight Weight Radioisotope Heater Unit

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--M--

mAMilli-Amp
MACMagnetometer Alignment Coil
MACMass Acceleration Curve
MAGDual Technique Magnetometer
MAGMagnetic Field Investigation
MagMagnetics
MAGMagnetometer
MAGMagnetometer Subsystem
MAPMission Activity Profile
MAPEXMap Expansion (Channelization)
MAPSMagnetospheric and Plasma Science (working group)
maxMaximum
MbMagabits
MBIMulti-Beam Imaging Radar (A RADAR mode)
MCMap Compiler (Creates Docommutation Map)
MCCMagnetometer Calibration Coil
MCDSMulti-Interface Circuit Data Sheet
MCPMicrochannel Plate
MCSMultimission Command System
MDDAMini Dual Drive Actuator
MDEMechanism Drive Electronics
MDPMaximum Design Pressure
MDPMission Design Panel
MDSCCMadrid Deep Space Communications Complex
MDUMaster Data Unit (Centaur)
MEMain Electronics
MEMain Engine
MEAMain Electronic Assembly
MEAMain Engine Actuator
MEAMain Engine Assembly (includes gimbals)
MEBPMain Engine Base Plate
MECOMain Engine Cutt Off
MESMain Engine Start
METMission Elapsed Time
MEVMain Engine Valve
MEVDMain Engine Valve Driver
MFILEMnemonic Command File
MFGManufacturer
MGDSMultimission Ground Data System
MGLMinimum Gain Level
MGNMagellan
MGSEMechanical Ground Support Equipment
MHDMagneto-Hydrodynamic
MHWMulti-Hundered Watt
MHzMega-Hertz; frequencies in millions of cycles/sec
MICDMechanical Interface Control Drawing
MIFMicrometeoroid Induced Failure
Mil.001 inch (.0254 mm)
MILMerritt Island DSS Complex
MILAMerritt Island Launch Area
MIL-STDMilitary Standard
MIMIMagnetospheric Imaging Instrument Subsystem
MIMI CHEMS Magnetospheric Imaging experiment, Charge-Energy-Mass Spectrometer
MIMI LEMMSMagnetospheric Imaging Experiment, Low Energy
MinMinimum
MIPMission Integration Panel
MIPLMulti-mission Image Processing Lab
MIPSMillion Instructions Per Second
MIPSMultimission Image Processing System
MIRMid Infrared
MIRIS Modified Infrared Interometer Spectrometer and Radiometer (A Voyager Science Instrument)
MLIMulti-Layer Insulation
MMMission Module
MMACMulti Mass Acceleration Curve
MMCMartin Marietta Corporation
MMDMTMulti-Mission Data Mgmt Team
MMECDRMultimission Expanded Channelized Data Record
MMHMonomethyl Hydrazine
MMIIMariner Mark II
MNOSMetal Nitride Oxide Semiconductor
MOAMemorandum of Agreement
ModModule
MO&DAMission Operations and Data Analysis phase
MODBMission Operations Data Base
MONMixed Oxides of Nitrogen - Bipropellant Oxidizer
Monte Carlo Statistical simulation technique used to analyze random or probabilistic proceeds
MOPMaximum Operating Pressure
MOPSManeuver Operations Program
MORMission Operations Review
MOSMetal Oxide Semiconductor (devices)
MOSMission Operations System
MOSFETMetal Oxide Semiconductor Field Effect Transistor
MOSOMultimission Operations System Organization
MOUMemorandum of Understanding
MPMission Plan
MPMultiplier
MPDMono-propellant Driver
MPIMax Planck Institute
MPI/KMax Planck Institute for Kernphysik
MPLVMonopropellant Tank Assembly
MPSMemory Power Subassembly
MPTMission Planning Team
MPVTMission Planning Virtual Team
Mrad Milliradians (Equivalent to 1 x 10-3 radians [1? = 17.45 mrad])
MRBMaterial Review Board
MRDMission Requirements Documents
MRRMission Requirements Request
MRRDMission Requirements Reference Docuemnt
mSMillisecond
MSAMission Support Area
MSARMicrowave Spectrometer and Radiometer
MSASMultimission Spacecraft Analysis Subsystem
MSBMost Significant Bit
MSCMagnetic Search Coil
MSC/LPMagnetic Search Coil/Langmuir Probe
Msec.001 second
MSIMedium Scale Integration
MSPSAMissile Sys. Prelaunch Safety Approval
MSPSPMissile Safety Prelaunch Safety Package
MSSMechanisms Subsystems
MSSMission Sequence Subsystem
MSSLMullard Space Science Laboratory
MSSOMission Support & Service Office
MSTIMiniature Seeker Technology Integration
MSWMost Significant Word
MTAMonopropellant Tank Assembly
MTBFMean time between failures
MTFModulation Transfer Function
MTSMission Telemetry System
mVMilivolt
mW.001 Watt
mradMicroradians (Equivalent to 2 x 10-6 radians)
msMicrosecond (.000001)

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--N--

NNewton
n,#number of, or number
NANarrow Angle
NANot Applicable
N/ANot Applicable
N/ANot Available
NACNarrow Angle Camera (Part of ISS)
NACENarrow Angle Camera Electronics
NACHNarrow Angle Camera Head
NAIFNavigation Ancillary Information Facility
NASANational Aeronautics and Space Administration
NASCOMNASA Communications Network
NavNavigation
NAVNavigation Team
NBSNational Bureau of Standards
NCASE Number of long-term Monte Carlo cases (initial trajectory states at spacecraft failure times)
NCHNarrow Angle Camera Head
NCINarrow Angle Camera Interface
NCRX Number of Earth torus crossings encountered in all long-term Monte Carlo cases
NDENon-Destructive Evaluation
NEANoise Equivalent Angle
NEINon Explosive Initiator
NEPNoise Equivalent Power
NEPNuclear-Electric Population
NEPANational Environmental Policy Act
NERTNear Real Time
NESRNoise Equivalent Spectral Radiance
NGANon-gravitational accelerations
NGIMSNeutral Gas and Ion Spectrometer
N2H2Hydrazine
NHBNASA Handbook
NIMSNear Infrared Mapping Spectrometer Subsystem
NIRSNear Infrared Spectrometer
NLSNational Launch System
NMINASA Management Instruction
NMOSN-Channel Metal Oxide Semiconductor
NOCCNetwork Operations Control Center
NomNominal
Non-operNon-operating
NPNavigation Plan
NRNavigation Requirements
NRZNon-Return-to-zero
NSINASA Science Internet
NSINASA Standard Initiators
NSONuclear Safe Orbit
NSSDCNational Space Science Data Center (at Goddard)
nTnano Tesla
NTONitrogen Tetroxide
NTONitrogen Tetroxide - Bipropellant Oxidizer
NVRNon-Volatile Residue
NXTNASA Standard-X-Band Transponder

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--O--

OOptional
OACTNASA Office of Advanced Concepts and Technology
OBDHOn-Board Data Handling
OCTOperations Control Team
ODOrbit Determination
ODOuter Diameter
ODMOrbit Deflection Maneuver
ODPOrbit Determination Program
ODROriginal Data Record
ODTOrbiter Delay Time
OEDOrthogonal Electric Dipoles
OIAOperational Interface Agreement
OMPObservatoire Midi-Pyrénées/Midi-Pyrénées Observatory (Toulouse, FR)
OMSCOrthogonal Magnetic Search Coils
ONIPSOptical Navigation Image Processing System
ONPOptical Navigation Program
O/POutput
OPAOptics Assembly
OP AMPOperational Amplifier
OPEOrbiter Purge Equipment
OperOperating
OPNAVOptical Navigation
OpsOperations
OPTGOrbit Propagation and Timing Geometry File
OrbOrbiter
ORSOptical Remote Sensing
OSCNASA Office of Space Communications
OSFNASA Office of Space Flight
OSPOrbit Specific Plan
OSSOffice of Space Science
OTLOperational Team Lead
OSSA Office of Space Science and Applications (of NASA)
OSSIJPL Office of Space Science and Instruments

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--P--


PPerihelion
PPressure
PProposal
PAProduct Assurance
PAAProbe Aspect Angle
PADProject Authorization Document
PA&IPlanning, Assessment and Integration
PAIOPlanning, Assessment and Integration Office
PALProgrammable Array Logic
PAMPayload Assist Module
PAM-SPayload Assist Module-Special
PbLead
PBPlayback
PBRepaired By
PCPersonal Computer
PCPower Control, Chamber Pressure
PCAPower Control Assembly
PCAPower Converter Assembly
PCAPressurant Control Assembly (part of PMS)
PCCPhotoconductive
PCCBProject Change Control Board
PCDProject Change Directive
PCEPower Conditioning Equipment
PcK Planet Physical and Cartographic Constraints (in the NAIF SPICE system)
PcKSpice file containing a selected set of physical and cartographic constants
PCMPulse-Code Modulation
PCRProject Capability Review
PCUPowerConversion Unit
PDProject Document (Documentation)
PDAPower Distribution Assembly
PDBProject Data Base
PDDProgram Design Document
PDFProbability Density Function
PDMPProject Data Management Plan
PDRPreliminary Design Review
PDRSProbe Data Relay Subsystem
PDSNASA Planetary Data System
PDSProject Data System
PDTPointing Design Tool
PEFPredicted Event File
PENLComet Penetrator Lander
pFpicoFarad
PFProtoflight
PfdPicofarad
PF(i)Probability of failure for the ith failure mode
PFMProtoflight Model
PFRProblem/Failure Report (A JPL Form)
P/FRProblem Failure Report
PFUProtoflight Unit
PHSFPayload Handling and Servicing Facility
PHSSProbe Harness Subsystem
PIPrincipal Investigator on a PI/Instrument Investigation
PIProbability of Earth impact
PIAPropellant Isolation Assembly
PI/CRX Probability of Earth impact given that the spacecraft has passed through Earth's torus
PIDDP Planetary Instrument Definition and Development Program
PIDDR Preliminary Instrument Functional/Interface Requirements Design and review
PI/F(i) Probability of a resultant Earth impact trajectory given an occurrence of the ith failure mode
PIOPublic Information Office
PIRDRPreliminary Interface Requirements and Design Review
PIRLSProbe IR Laser Spectrometer
PLDProgrammable Logic Drive, or Payload
PLFPayload Fairing
PLLPhase-Locked Loop
PLPPPre (or Post) Launch Planetary Protection Report
PLSPlasma Spectrometer
PMProject Manager
PMAPropulsion Module Assembly
PMCProbe Mission Complete (Completion)
PMDPropulsion Management Device
PMRProject Management Report
PMSPerformance Management System
PMSPower Management System (in MAG)
PMSPropulsion Module Subsystem
PMSEAPropulsion Module Subsystem, Electronics Assembly
PMTPhoto Multiplier Tube
PNR(i) Probability of no recovery given the failure mode and the time of impact
POCProbe Operations Center
POEProbe Orbiter Earth Angle
PORPower On Reset
POSWProbe On-Board Software
PPProject Plan
PPFPayload Processing Facility
PPF/HPF Payload Processing Facility/Hazardous Processing Facility
ppmParts per Million
PPOPressed Plutonium Oxide
PPPPlanetary Protection Plan
PPRDProject Policies & Requirements Document
PPSPower & Pyrotechnics Subsytem
PPSSPower & Pyrotechnic Subsystem Simulator
PRAPlanetary Ranging Assembly
PRAProbe Relay Antenna
PRBHuygens Probe
PrbProbe
PRDProgram Requirements Document
PRIPulse Repetition Interval
PRLProbe Relay Link
PRMPeriapsis Raise Maneuver
PRMProbe Release Maneuver
PROMProgrammable Read-Only Memory
PropulPropulsion
PRRProject Requirements Review
PRTPlatinum Resistance Thermometer
PRWSPlasma and Radio Wave Spectrometer
PSParticipating Scientist
P/SPower Supply
PS Project Scientist
P & S Planning and Sequencing
PSAProbe Support Avionics
PSCFLPreliminary safety critical function list
PSCN Probe Support Communications Network
PSEProbe Support Equipment
PSGProject Science Group
psiPounds per Square Inch
PSIG Pounds per square inch gauge (pressure)
PSKPhase-Shift Keying
PSLProject Software Library
PSRProject Status Review
PSSProbe Support Subsystem
PSSRPlasma Spectroscopy/Sounder Receiver
PSTPI Science Team
PSUPyro Switching Unit
PSUPower Supply Unit
PTMProbe Targeting Maneuver
PTMProof Test Model
PuPlutonium
Pu-238Plutonium-238
PVPhotovoltaic
PVDFPolyvinlydene Flouride
PWAPlasma Wave Analyzer
PWBPrinting Wiring Board
PwrPower

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--Q--

QAQuality Assurance
QAIQuality Assurance Instruction
QCQuality Control
QFDQuality Function Deployment
QFSQualification & Flight Spare
QLQuick Look
QtyQuantity
QualQualify (Qualification)
QQCQuantity, Quality, and Continuity
QtyQuantity

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--R--

RACSRadiation Analysis Completion Statement
RADAbsorbed radiation in Silicon
RadRadiation effect on a part
RADRadio Science
RADARCassini Radar Subsystem
RAMRandom Access Memory
RARRisk Assessment Review
RASRadar Altimeter Science
R-AxisAlong the anti-sun line
RCPRight-Hand Circularly Polarized
R/CRReview/Certification Requirements
RCSReaction Control Subsystem
RCTReaction Control Thruster
RCVRReceiver
RDReference Document
RDDRelease Description(s) Document
RDMRadiation Design Margin
RDRReduced Data Record
REARocket Engine Assembly
RelRelease
ReqRequirement
REURemote Engineering Unit
RFRadio Frequency
RFERadio Frequency Electronics
RFEReceiver Front End (LNA/Diplexer)
RFEARadio Frequency Electronics Assembly
RFESRadio Frequency Electronics Subsystem (Part of RADAR)
RFIRadio Frequency Interference
RFISRadio Frequency Instrument Subsystem
RFSRadio Frequency Subsystem
RFSTLCRFS Tracking Loop Capacitor
RHCPRight Hand Circular Polarization
RHURadioisotope Heater Unit
RIMSRetarding Ion Mass Spectrometer
RITORefraction Index of Titan Ocean
RJJupiter Radii
RJRadius of Jupiter
RJRadius of Jupiter
RLPSE Remote Launch Pad Support Equipment
RMSRoot Mean Square
RODSRemote Operating Data System
ROEReal-Time Operations Element
ROMRead Only Memory
ROMRough Order Magnitude
RORSATRadar Ocean Reconnaissance Satellite
RPRadio Propagation
RPARetarding Potential Analyzer
RPA/LPRetarding Potential Analyzer/Langmuir Probe
RPCRing Plane Crossing
RPFResource Prediction File
RPMRevolution Per Minute
RPWSRadio and Plasma Wave Science Subsystem
R&QAReliability and Quality Assurance
RRLRadio Relay Link
RSRadio Science Investigation
RSRadius of Saturn
RSRadius of Saturn
R-SReed-Solomon Encoding Method
RSSaturn Radii
RSDLRead-Solomon Downlink
RSPRemote Sensing Pallet
RS & QAReliability, Safety & Quality Assurance
RSSRadio Science Subsystem
RSSRoot Sum Squares
RSTRadio Science Team
RTRemote Terminal
RTReal Time
R/TReal-Time
R-TReal-time
RTDResistive Thermal Device
RTDTRemote Terminal Descriptor Table
RTGRadioisotope Thermionic Generator
RTIReal Time Interrupt
RTIReal Time Interval
RTIUReal Time Interface Unit
RTIURemote Terminal Interface Unit
RTOReal Time Operations
RUSOReceiver Ultra Stable Oscillator (USO)
RVFResource Verification File
RWReaction Wheel
RWAReaction Wheel Assembly
RWEReaction Wheel Electronics
RWIReaction Wheel Interface
RWMReaction Wheel Mechanism
RWXReaction Wheel Extension

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--S--

SSecond
S/ASafe-Arm Circuit
SASystem Administrator
S & A Safe and Arm
SAESafety Engineer
SAEFSpacecraft Assembly and Encapsulation Facility (at KSC)
SAFSpacecraft Assembly Facility (JPL Bldg. 179)
SA FileScience Activities File
SAHSystem Assembly Hardware
SAMSaturn Atmosphere Mapper
SAMSCR Approval Meeting
SAMSpectrum Analyzer Module
SAM-RCStructures and Materials Safety Review Committee
SAPEScience and Project Engineering
SARSafety Analysis Report
SARSynthetic Aperture Radar (A RADAR Model)
SASFSpacecraft Activity Sequence File
SASWSupport Avionics Software
SATDevice to be Selected-at-Test
SATSelect-at-Test
S-BandRadio Frequencies between 2 and 4 GHz
SBP PD 699-511 Cassini Flight/Ground Software Capabilities Build Plan
SBT, S-Band TxS-Band Transmitter
SCScience Coordinator
SCSpacecraft
S/CSpacecraft
SCASScience Calibration Subsystem
SCATNadir-looking Scatterometer, A RADAR mode
SCCSSource Code Control System
SCDTSpacecraft Design Team
SCETSpacecraft Event Time
SCFLSafety critical function list
SciScience
SCIScience Subsystem
SCIScience Teams
SCLKSpacecraft Clock
SCI & MPScience & Mission Planning
SCMSoftware Configuration Manager
SCMGSoftware Configuration Management Group
SCMLSystem Configuration Management Library
SCMPSoftware Configuration Management Plan
SCMSSystem Configuration Management Subgroup
SCOSpacecraft Office
SCOESpecial-purpose checkout equipment
SCRSilicon Controlled Rectifier
SCRSoftware Change Request
SCRSequence Change Request
SCSSpacecraft System
SCSIStandard Computer System Interface
SCTSpacecraft Design Team
SCTSpacecraft Team
SCUSequence Control Unit (on Centaur)
SDDSoftware Design Document
SDDSystem Design Document
SDFSupplementary Data File
SDGSystem Design Group
SDRSoftware Design Review
SDTSequence Design Team
SESupport Equipment
SESystem Engineer
SEBSingle Event Burnout
SECSecond
SE & CSystem Engineer and Coordination
SEDSaturn Electrostatic Discharge(s)
SEDSpin/Eject Device
SEDRSupplementary Experiment Data Record
SEESingle Event Effects (upsets, latchups and burnouts)
SEEGASolar-Electric Earth Gravity Assist
SEFSpacecraft Events File
SEFHStandard Cubic per Hour
SEGSequence of Events Generation
SEGRSingle Event Gate Rupture
SEISoftware Engineering Institute
SELSingle Event Latchup
SEMPAScanning Electron Microscope and Particle Analyzer
SepSeparation
SEPSolar-Electric Propulsion
SEPSSeparation Subsystem
SeqSequence
SEQGENSequence Generator
SEQTRANSequence Translator
SEUSingle Event Upset
SFDUStandard Formatted Data Unit
SFDUGUISFDU Graphical User Interface
SFOCSpace Flight Operations Center
SFOPSpace Flight Operation Plan
SFOSSpace Flight Operations Schedule
SFTSystem Functional Test
SHESensor Head Electronics
SIScience Instruments
SiSilicon
SIESequence Integration Engineer
SigSignal
SIMScience Instrument Manager
SIMSSecondary Ion Mass Spectrometer
SINDASystems Improved Numerical Differencing Analyzer
SIPSScience Instrument Purge Subsystem
SIRDSupport Instrumentation Requirement Document
SISSoftware Interface Specification
SITScience Integrated Timeline
SITMSpacecraft Integration & Test Manager
SITPSubsystem Integration & Test Plan
SKRSaturn Kilometric Radiation
SKRSaturn Kilometric Radio Emission
SLSelection Letter
SLATSSolar Linear Array Technology System
SLOCSource Line of Code
SLT System Level Testing (Any testing while the instrument is installed on the spacecraft)
SMSection Manager
SMDScience and Mission Design Office
SMDCShielded Mild Detonating Cord
SMPSoftware Management Plan
SMRSoftware Management Review
SNSerial Number
SNRSignal-to-Noise Ratio
SNRSignal-TV-Noise Ratio
SOS-Band Downlink
SOScience Operations
SOAScience Opportunity Analyzer
SODScience Observation Design
SODBScience Operations Data Base
SOESequence of Events
SOHSafety Operations Handling Document
SOISaturn Orbit Insertion
SOIRDSpacecraft Operations Interface Req. Document
SOI/SOS Silicon-on-Insulator, Silicon-on-Sapphire
SOPStandard Operating Procedure
SOPScience Operations Plan
SOPCScience Operations and Planning Computer
SOSTSatellite Orbiter Science Team
SOURADAR Sounder mode
SOWStatement of Work
SPSafety Plan
SPSequence Program
SPScience Planning
SPASoftware Product Assurance
SPAESoftware Product Assurance Engineer
SPAPSoftware Product Assurance Plan
SPAPSSubsystem Parts Allocation Planning Summary
SPASESoftware Product Assurance System Engineer
SPCScience Programme Committee of ESA
SPCSignal Processing Center
SPDTSingle Pole Double Throw
SPESignal Processing Electronics
SPESun Probe-Earth Angle
SPECTSpectrometer
SPFSingle Point Failure
SPICEInformation System Produced by the NAIF Team
SPICE Spacecraft, Planet, Instruments, C-matrix, and Events kernels
SPICE Superthermal Plasma Investigation of cometary Environments
SPICEThe set of ancillary information in the NAIF system
SPKSpacecraft and/or Celestial Body File
SPKSpacecraft and Planet ephemeris data file (Kernel)
SPOTScience Planning and Operations Team
SPPSequence Planning Preview
SPRLSpace Physics Research Laboratory (University of Michigan)
SPSSpacecraft Purge Subsystem
SPTSpecific Performance Test
SPVTScience Planning Virtual Team
SQRSpacecraft Qualification Review
SRSafety Review
SRShunt Radiator
SR-90Strontium-90
SRAShunt Regulator Assembly
SRCRSoftware Review Certification Requirement(s)
SRDScience Requirement(s) Document
SRDDSoftware Release Description Document
SRESubsystem Reliability Engineer
SRMSolid Rocket Motor
SRMUSolid Rocket Motor Upgrade
SRRSoftware Requirements Review
SRRDScience Requirements Reference Document
SRTGSimulated Radioisotope Thermoelectric Generator
SRUStellar Reference Unit
S/SSubsystem
SSSun Sensor
SSASun Sensor Assembly
SSACSpace Science Advisory Committee of ESA
SSAKSecond surface aluminized kapton
SSANSpace Science and Applications Notice
SSASCSpace Science and Applications Steering Committee
SSCCBSpacecraft System Change Control Board
SSDSoftware Specifications Document
SSDSolid State Detector
SSDPSSolar System Data Processing System
SSESoftware System Engineer
SSESun Sensor Electronics
SSEC Solar System Exploration Committee (A committee of the NASA Advisory Council)
SSEFSpacecraft Significant Events File
SSHSun Sensor Head
SSHASoftware Specification and Procedures Manual
SSHASun Sensor Head Assembly
SSMSpacecraft System Manager
SSMSystem Software Manager
SSOSun-Synchronous Orbit
SSOSystems Safety Office
SSPSurface Science Package
SSPMSoftware Specification and Procedures Manual
SSPSSolid State Power Switch
SSRSolid State Recorder (spacecraft data storage device)
SSUPScience Sequence Update Process
SSYSFSubsystem Fail Flag
STStandard JPL Specification
STATRJStation Polynomial File
STCSystem Test Complex
STDStandard
STDStandard DSN Station
STESystem Test Equipment
STMSafe-To-Mate
STORSystem Test Operations Report
STPSoftware Test Plan
STPSolar Thermal Population
STPMStructural/Thermal/Pyro Model
STRUStructure Subsystem
STSSpace Transportation System (Shuttle)
STSESystem Test Support Equipment
STVSolar Thermal Vacuum
SVSpace Vehicle
SVDSSatellite Vehicle Destruct System
SVDSSpace Vehicle Destruct System
SVSSimulation and Verification Services
SVTSequence Virtual Team
SVTLSequence Virual Team Lead
SWSoftware
S/WSoftware
SW CESoftware Cognizant Engineer
SW Cog ESoftware Cognizant Engineer
SWDRSoftware Design Review
SWGScience Working Group
SWI&TSoftware Integration & Test
SwRISouthwest Research Institute
SWRRSoftware Requirements Review
SW TESoftware Test Engineer
SW TMSoftware Technical Manager
SWVDRSoftware Version Delivery Review
SYSSimulation & Verification Services

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--T--

TTesla
TaTantalum
TAGTest Agency
TAPTechnology and Applications Program
TARTape Archive (Utility)
T-AXISN cross R
TBTest Bed
TBCTo Be Confirmed
TBCTest Bed Converter
TBDTo Be Determined (or Defined)
TBRTo Be Resolved
TBRTo Be Reviewed
TBSTo Be Supplied
TcTemperature Coefficient/Correction Factor
T/CTemperature Control
TCAThruster Cluster Assembly
TCATime of Closest Approach
TCDTrajectory Characteristics Document
TCDMTelemetry Command/Data Mgmt.
TCMTemperature Control Model
TCMTrajectory Correction Maneuver
TCP/IPTransmission Control Protocol/Internet Protocol
TCSTelecommunications Subsystem
TCPSTitan IV/Centaur Purge Subsystem
TC STATest Conductor Station
TCUTelemetry Control Unit (Part of RFS)
TDAOffice of Tracking and Data Acquisition (JPL)
TDCTime to Digital Data Converter
TDLTemplate Definition Language
TDMThermal Development Model
TDSTelemetry Delivery System
TDSTime Domain Sampler
TDSTracking & Data Acquisition System
TDSTracking and Data Services Element
TDSTracking and Data System
TempTemperature effect on a part
TEMPTemperature Control Subsystem
TFTransfer Frame
TFETetrafluoroethylene (Teflon)
ThThorium
THSSThermal Control Subsystem
TIATeam Interface Agreement
TIDTotal Ionizing Dose
TIFTelemetry Input System
TimTelemetry
TIPTarget Interface Point
TIRThermal Infrared Radiometer
TIREXThermal Infrared Radiometer Experiment
TISTelemetry Input System
TIVTitan IV
TJPart Junction Temperature
TLFacility Investigation Team Leader
TLTeam Leader (Facility Instrument)
TLThermoluminescence
TLTimeline Plot
TLDThermoluminescent Dosimeter
TLMTelemetry
TLMTelemetry Modulation
TLVThreshold Limit Value
TMTechnical Manager
TMTeam Member (Facility Instrument)
TMTelemetry
TMTemperature Multiplying Factor
TMCTarget Motion Compensation
TMMThermal Mathematical Model
TMODTelecommunications & Mission Operations Directorate
TMPTelemetry Processor Module
TMUTelemetry Modulation Unit
TOTask Order
T & OTest and Operations
T & OM Test and Operations Manager
TOFTime of Flight
TOF-LEFTime of Flight - Linear Electron Field
TOF-STTime of Flight - Straight Through
TOLTime Ordered Listing
TOLTolerance of a Part
TOPTest Operations Plan
TOSTTitan Orbiter Science Team
TOTTelemetry Output Tool
TPTime of Periapsis
TPMTelemetry Processor Module (REU portion of PMS)
TPMTelemetry Propulsion Module
TPV Thermophotovoltaic
TRACERTracing and Control of Engineering Requirements
TRKTrack
TRMTitan Radar Mapper
TRSFTest Results Summary Form
TSTargeting Specification
TSPTwisted Shielded Pair
TSRTechnical Status Review
TSRTechnical Support Representative
TSPTwisted Shielded Pair
TSSTelecommunications Subsystem
TSTTarget & Star Tracker
TTTurntable
TTACSTest Telemetry & Command System
TT&CTelemetry Tracking and Command
TTLTransistor-Transistor Logic
TUBTechnical University of Braunchwieg
TUSO Transmitter Ultra Stable Oscillator
TVThermal Vacuum
TVAThruster/Valve Assembly
TVCThrust Vector Control
TWNCTwo-way Nocoherent
TWTTraveling Wave Tube
TWTTarget Working Team
TWTATraveling Wave Tube Amplifier
TxTransmitter
TypTypical

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--U--

UUranium
UARSUpper Atmospheric Research Satellite
UCDUser Controlled Data Base
UDMHUnsymmetrical Di-Methyl Hydrazine
UDSUniversal Documention System
UDTUniversal Daylight Time
UEMUpper Equipment Module
UGMicroprocessor Software User's Guide
UGUser's Guide
UG/SOMUser's Guide/Software Operations Manual
U/LUplink
ULCERUmbilical Lines Checker
ULOUplink Operations
ULSUlysses
UMUniversity of Michigan
UmbUmbilical
UNAUn-allocated
UOEUplink Operations Element
UPUtility Program
UPAMUplink Package Approval Meeting
USAFU. S. Air Force
USARUpdated Safety Analysis Report
USMUmbilical Separator Mechanism
USOUltra Stable Oscillator
USSUpper Shell Structure
UT1Universal Time
UTCUniversal Time Code
UTMCUnited Technologies Microelectronics Center
UTPMUniversal Time and Polar Motion
UVUltraviolet
UVUndervoltage
UVISUltraviolet Imaging Spectrometer Subsystem
UVSIUltraviolet Spectrometr and Imager

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--V--

VVolts
VACVolts Alternating Current
VCVirtual Channel
VCCPVirtual Channel Command Program
VCDVerification Control Document
VCEVisible Channel Electronics (Part of VIMS)
VCMVolatile Condensible Material
VCOVoltage Controlled Oscillator
VDCVolts Direct Current
VDEValve Drive Electronics
VDECUValve Drive Electronics Control Unit
VDMValve Drive Module
VEEGAVenus-Earth-Earth Gravity Assist (a trajectory tape)
VEGAVenus-Earth-Gravity-Assist
VEJGAVenus-Earth-Jupiter Gravity Assist (a trajectory type)
VGRVoyager
VHMVector Helium Magnetometer
VIVisual Editor
VibVibration
VIMSVisual and Infrared Mapping Spectrometer Subsystem
VIMS-IRVIMS Infrared Channel
VIMS-VVIMS Visible Channel
VLBIVery Long Baseline Interferometry
VO75Viking Orbiter
VOCVolts Direct Current
VOLVolume
VPFVertical Processing Facility
VRHUVariable Radioisotope Heater Unit
V/SHMVector/Scalar Hellium Magnetometer
VSWRVoltage Standing Wave Ratio
VVEGAVenus-Venus-Earth-Gravity-Assist
VVEJGAVenus-Venus-Earth-Jupiter Gravity Assist
VVVJGAVenus-Venus-Venus-Jupiter-Gravity-Assist

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--W--

WTungsten (Wolfram)
WAWide Angle
WAWide Angle (Camera - Part of ISS)
WACWide Angle Camera (Part of ISS)
WACEWide Angle Camera Electronics
WACHWide Angle Camera Head
WBSWork Breakdown Structure
WCAWorst Case Analysis
WC(A)Worst Case (Analysis)
WCAWorst Case (Circuit) Analysis
WCHWide Angle Camera Head
WCIWide Angle Camera Interface
WF/PCWide Field/Planetary Camera
WIPWork Implementation Plan
W/m2Watts per Square Meter
WOTU Window on the Universe (MOSO's file access & transfer software)
WPAWork Package Agreement
WRTWith Respect To
W.R.T.With Respect To
WSWorkstation
WSEWorkstation Environment
WSMCWestern Space and Mission Center
WSMCRWestern Space and Missile Center Regulation
WTWorking Timeline
WTAWax Thermal Actuator

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--X--
XBACross-Strap Bus Adapter (Part of CDS)
X-BandRadio Frequencies between 8 and 12 GHz
XMTRTransmitter
XSSAX-Band Solid State Adapter (Part of CDS)
XSSAX-Band Solid State Amplifier
XSSPAX-Band Solid State Power Amplifier
XSTRPCross-Strap
X-TWTAX-Band Traveling Wave Tube Amplifier

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--Z--

ZZulu Time (UTC). Used in PDS.
ZLPZero Length Packet

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