CAPS Cassini Acronyms

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--
AACS	Attitude and Articulation Control Subsystem
AB	Approved By
AC	Alternating Current
ACC	Accelerometer
ACCE	Accelerometer Electronics
ACCH	Accelerometer Head
ACE	Attitude Control Electronics
ACH	Accelerometer Head
ACI	Accelerometer Interface
ACP	Aerosol Collector and Pyrolyzer
ACT	Actuator
AD	Applicable Document
A/D	Analog-to-Digital
ADC	Analog-to-Digital Converter
ADP	Automatic Data Processing
AF	US Air Force
AFC	AACS Flight Computer
AFETR	Air Force Eastern Test Range
AFETRM	Air Force Eastern Test Range Manual
AFT	Abbreviated Functional Test
AFT	Allowable Flight Temperature
AGC	Automatic Gain Control
AHSE	Assembly, Handling, & Support Equipment
AIS	Automated Information System
AIT	Assembly, Integration & Test
AIV	Assembly, Integration & Verification
AL	Aluminum
AL	Agreement Letter
AL	Anomalously Large
ALAP	As Low As Practical
ALARA	As Low As Reasonably Achievable
ALD	Assistant Laboratory Director
ALF	Assisted Load Format
ALT	Nadir Looking Altimeter, A RADAR mode
AM	Americium
AMMOS	Advanced Multimission Operations System
AMO	Air Mass Zero
AMTEC	Alkali Metal Thermoelectric Converter
Ant	Antenna
ANT	Antenna Subsystem
AO	Announcement of Opportunity
AP	Action Program
AP	Activity Plan
AP	Auxiliary Propulsion
APGEN	Activity Plan Generator
APID	Application Processing Identification
APL	Approved Parts List
APN	Administrative Practices Notebook
APP	Automated Picture Planning
APS	Airborne Purge Subsystem
APSA	Advanced Photovoltaic Solar Array
AQS	Acquisition Sun Sensor
ARC	Ames Research Centerr
ARIA	Advanced Range Instrumentation Aircraft
ARWM	Articlated Reaction Wheel Mechanism
ASCII	American Standard Character Code for Information Exchange
ASE	Airborne Support Equipment
ASI	Agenzia Spaziale Italiana (Italian Space Agency)
ASI	Atmospheric Structure Instrument
ASIC	Application-Specific Integrated Circuit
ASME	American Society of Mechanical Engineers
Assy	Assembly
ASTM	American Society for Testing and Materials
ATDF	Archival Tracking Data File
ATLO	Assembly, Test and Launch Operations
ATP	Acceptance Test Procedure (or Plan)
AU	Astronomical Unit
AUX, OSC	Auxiliary oscillator
AWG	American Wire Gauge
Az	Azimuth
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--B--
B	Billions
Ba	Barium
BA	Bus Adapter
BAIL	Backup ALF Injection Loader
BB	Basebody
BC	Bus Controller
BCA	Battery Control Assembly
BCE	Bench Checkout Equipment
BCRTM	Bus Controller, Remote Terminal, Monitor
BCSS	Back Cover Subsystem
BD	Burst Disc
BER	Bit Error Rate
BIH	Bureau International de 1'Heure
BIT	Built-In Test
BIU	Bus Interface Unit
BOB	Breakout Box
BOL	Beginning of Life
BOM	Beginning of Mission
BPF	Band Pass Filter
BPLV	Bipropellant Latch Valve
BPLVD	Bipropellant Latch Valve Driver
BPS	Bits Per Second
BRF	Band Reject Filter
B/S	Boresight
BTA	Bipropellant Tank Assembly
BTK	Block for Transfer and Correction
BTU	British Thermal Unit
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--C--
C3	Trajectory Energy parameter = twice the injection energy per unit mass = V2?I
CA	Chemical Analyzer
C/A	Closest Approach
CABL	Cabling Subsystem
CAE	Computer Aided Engineering
CAL	Calibrated
Caltech	California Institute of Technology
CAM	Collision Avoidance Maneuver
CAPS	Cassini Plasma Spectrometer Subsystem
CAPTRAN	Macro Validation Tool
CAR	Command Ambiguity Resolver
CAS	Cassini
CASE	Computer Aided Software Engineering
CAT	Chemical Analyzer Target
CATS	Cassini AACS Test Station
CB	Concurred By
CBE	Current Best Estimate
CBH	Catalyst Bed Heater
CBL	Cabling
C/C	CRAF/Cassini
CC	Cargo Container
CCA	Change Control Authority
CCI	Cassini Critical Item
CCAFS	Cape Canaveral Air Force Station
C/CAM	Collision and Contamination Avoidance Maneuver
CCB	Change Control Board
CCB	Configuration Control Board
CCD	Change Coupled Device (Visible Focal Plane Array)
CCDS	Charge Coupled Device Standards
CCE	Camera Control Electronics
CCL	Channel Conversation Language
CCPOCC	CRAF/Cassini Payload Operations Control Center
CCSDS	Consultative Committee for Space Data Systems
CCT	Central Communications Terminal
CDA	Cosmic Dust Analyzer Subsystem
CDB	Central Data Base
CDF	Common Data Format
CDL	Command Data Languatge
CDMS	Command & Data Management System (Probe)
CDR	Channel Data Record
CDR	Critical Design Review
CDROM	Compact Disc Read Only Memory
CDS	Circuit Data Sheet
CDS	Command & Data Subsystem
CDSCC	Canberra Deep Space Communications Complex
CDSS	Command & Data Subsystem Simulator
CDS-SE	Command & Data Subsystem Suport Equipment
CDU	Command Demodulation Unit
CDU	Command Detector Unit (Part of RFS)
CE	Cognizant Engineer
CE	Critical Enable
CEA	CIRS Electronics Assembly
CELV	Complementary Expendable Launch Vehicle
CEM	Channel Electron Multiplier
CEQ	Council on Environmental Quality
CEU	Central Electronics Unit
CG	Center of Gravity
CGS	Cassini Ground System (at JPL)
CHA	Camera Head Assembly
CHDO	Compressed Header Data Object
CHEMS	Charge-Energy-Mass Spectrometer (Part of MIMI)
CHPIP	Cassini/Huygens Project Implmentation Plan
CI	Configuration Item
CIDEX	Cometary Ice and Dust experiment
CIRS	Cassini Infrared Spectrometer
CIRS	Composite Infrared Spectrometer
CIRS	Composite Infrared Spectrometer Subsystem
CISO	Computing and Information Services Office (JPL)
CIT	California Institute of Technology
CIU	Control Interface Unit
CK (C-Kernel)	Instrument pointing information in the NAIF SPICE system (after Camera Channel Parameter Table)
CKT	Circuit
CL	Communication Line
CLCW	Command Link Control Work
CLTU	Command Link Transfer Unit
CM	Center of Mass
CM	Configuration Management
Cm-244	Curium-244
CMD	Command
CMOS	Complementary Metal Oxide Semiconductor
CMP	Configuration Management Plan
CNES	Centre National d'Etudes Spatiales (France)
Co	Cobalt
C/O	Check Out
Cog E	Cognizant Engineer
CO-I	Co-Investigator
COMA	Cometary Matter Analyzer
Comm Svc	Communication Services
COMPARE	File Comparison Software
COMPLEX	Committee on Planetary and Lunar Exploration
Conf	Confirmation
COP	Command Operation Procedure
COS	Common Operating System
Cos	Cosine
CP	Cassini Project
CPC	Compound Parabolic Concentrator
CPCI	Computer Program Configuration Item
CPF	Command Packet File
CPT	Channel Parameter Table
CPU	Central Processor Unit
CR	Concentration Ratio
CRAF	Comet Rendezvous/Asteroid Flyby
CRC	Critical Controller
CRC	Critical Register Control
CREWE	Coordinated Radio Electron and Waves Experiment
CRIMS	Cometary Retarding Ion Mass Spectrometer
CSA	Charge Sensitive Amplifer
CSCI	Computer Software Configuration Item
CSE	Cassini Security Engineer
CSOC	Consolidated Space Operations Contract
CSRRD	Cross-Systems Requirements Reference Document
CSS	Coarse Sun Sensor
CTA(-21)	DSN Compatibility Test Area
CTR	Cognizant Technical Representative
CTS	Communications Technology Satellite
CU	Control Unit
CV	Control Voltage
CW	Constant (or continuous) Wave
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--D--
DA	Direct Access
DA	Double Amplitude
DA	Dust Analyzer (from CDA)
DARA	Deutsche Agentur Für Raumfahrtangelegenheiten
DASIAC	Defense Atomic Support Information Analysis Center
DAU	Direct Access Unit
DB	Data Buffer
dB	Decibel
DBA	Data Bus Adapter
dBc	dB referenced to a carrier
dBc	Decibels below carrier
DBMS	Data Base Management System
DC	Direct Current
D(CDS)	Deferred CDS capability (software capability awaiting either an ECR or a post-launch implementation)
DCN	Document Change Notice
DCS	Data and Computing Services
D&CS	Data and Computing Services
DCSS	Descent Control System
DDA	Dual Drive Actuator
DDE	Displacement Damage Effect
DDOR	Delta Differential One-Way Ranging
DEF	Displacement equivalent Fluence
Delta-V	Velocity Increment (change in S/C velocity)
DESATS	Reaction Wheel Desaturation
DEV	Mechanical Devices Subsystem
DEVNET	Developement Network
DF	Dissipation Factor
DFPW	Downlink Fields Particles and Waves
DFTS	Dual-Fault-Tolerant Switch
DI	Dielectrically Isolated
DIFP	Differential Ion Flux Probe
DIPS	Dynamic Isotope Power System
DISR	Descent Imager/Spectral Radiometer
Div	Division
DL	Downlink
D/L	Downlink
DLIB	Document Library (JPL)
DMA	Direct Memory Access
DMD	Data Monitor and Display
DMR	Detailed Mission Requirements
DMWF	Desired Memory Word File
DN	Data Number
DN	Digital Number
DO	Distributed Operations
DOD	Depth of Discharge
DOD	Differential One-Way Doppler
DoD	U.S. Department of Defense
DoE	U.S. Department of Energy
DOI	Distributed Operations Interface
DOM	Distributed Operations Manager
DOM	Distributed Object Manager
DOP	Dioctylpthalate
DOR	Differenced One-way Ranging
DOT	Department of Transportation
DP	Direct Program
DP	Data Processing
DPA	Destructive Physical Analysis
DPA	Dipole Assembly
DPI	Data Processing Installation
DPTRAJ	Double Precision Trajectory
DPU	Data Processing Unit
DR	Data Record
DR	Discrepancy Report
DRD	Data Requirements Description
DRVID	Differenced Range Versus Integrated Doppler
DSA	Development Support Area
DSA	Digital Synchronization Assembly
DSCC	Deep Space Communication Complex
DSM	Deep Space Maneuver
DSN	Deep Space Network
DSNOT	Deep Space Network Operations Team
DSOT	Data Systems Operations Team
DSP	Dual Shearplate
DSS	Deep Space Station
DSS	Digital Assembly
DSS	Digital Subsystem
DST	Deep Space Transponder (Part of RFS)
DTM	Developmental Digital Test Model
DTM	Dynamics Test Model
DTR	Digital Tape Recorder
DTS	Dead Time Start
DTSTART	Dead Time Start
DUT	Device Under Test
DV	Velocity Increment (change in S/C velocity)
DV-EGA	Delta-V-Earth Gravity Assist (a trajectory type)
DWE	Doppler Wind Experiment
DWG	Discipline Working Group
DWGC	Discipline Working Group Chairperson
DX	Diplexer
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--E--
EA	Activation Energy
EAROM	Electronically Alterable Read Only Memory
EBS	EGSE Basic Software
ECARS	Electronic CAPS Activity Request System
ECI	Engineering Change Instruction
ECM	Engineering Change Management
ECO	Engineering Change Office
ECR	Engineering Change Request
EDAC	Error Detection and Correction
EDF	Engineering Data File
EDF	Experiment Data File
EDMG	Engineering Data Management Group
EDMS	Engineering Data Management System
EDR	Experiment Data Record
EDT	Engineering Flight Computer Diagnostic Tester
EED	Electro Explosive Device
EEE	Electronic, Electrical & Electromechanical
EEIS	End-to-End Information System
EFC	Engineering Flight Computers
EFCSE	Engineering Flight Computer Support Equipment
EFL	Effective Focal Length
EFP	Explosively Formed Projectile
EGA	Earth Gravity Assist
EGA	Engine Gimbal Actuator
EGE	Engine Gimbal Electronics
EGSE	Electrical Ground Support Equipment
EEIS	End-to-End Information System
EFC	Engineering Flight Computer
EFCSE	Engineering Flight Computer Support Equipment
EFL	Effective Focal Length
EFP	Explosively Formed Projectile
EGA	Engine Gimbal Actuator
EGE	Engine Gimbal Electronics
EGAP	Engine Gimbal Actuator P
EGSE	Probe Electrical Ground Support Equipment
EICD	Electrical Interface Control Drawing
EID	Experiment Interface Document
EIFOV	Effective Instantaneous Field of View
EIP	Experiment Implementation Plan
EIS	Environmental Impact Statement
EISSS	Environmental Impact Statement Supporting Studies
EJGA	Earth Jupiter Gravity Assist
EK (E-Kernel)	Log of Events and notes in the NAIF SPICE system
El	Elevation
ELM	Electronic Mail
ELS	Eastern Launch Site (includes CCAFS and KSC)
ELS	Electon Spectrometer (Part of CAPS)
ELV	Expendable Launch Vehicle
EM	Electromagnetic
EM	Engineering Model
EMC	Electromagnetic Compatibility
EMF	Electromagnetic Force
EMI	Electromagnetic Interference
EMI/RFI	Electromagnetic Interference/Radio Frequency Interference
EMTB	Engineering Model Test Bed
ENA	Enable
ENA	Energetic Neutral Analyzer
ENA	Energetic Neutral Atom
Engr	Engineering
EOL	End-of-Life
EOL	End-of-Life effect
EOM	End of Mission
EOP	End of Project
EOS-AM	Earth Observing System-Morning
EPC	Electronic Power Conditioner
EPD	Energetic Particle Detector
EPDC	Electrical Power Distribution Circultry
EPP & RD	Environmental Program Policy and Requirements Document
EPS	Earth-Probe-Sun
EPS	Electronics Packaging Subsystem
EPSS	Electrical Power Subsystem
E/q	Energy Per Unit Charge
ER	Eastern Range (KSC & CCAFS)
ERE	Environmental Requirements Engineer
ERT	Earth Received Time
ESA	European Space Agency
ESA	Explosive Safe Area
ESD	Electrostatic Discharge
ESDU	Engineering Flight Computer Software Developmental Unit
ESMC	USAF Eastern Space and Missile Center
ESMCR	Eastern Space and Missile Center Regulation
ESOC	ESA Space Operations Center
ESR	Effective Series Resistance
ESS	Energy Storage Assembly (part of RADAR)
ESS	Energy Storage Subsystem (part of RADAR)
ESTEC	European Space Research and Technology Center
ETA	Environmental Test Authorization
ETAF	Environmental Test Authorization Form
ETL	Environmental Test Labs
ETM	Element Technical Manager
ETR	Eastern Test Range
ETR	Equivalent Time Ratio
ETSS	Environmental Test Specification Summary
EU	Engineering Unit (part of CDS)
EUS	Energia Upper Stage
EUV	Extreme Ultraviolet
EUV	Extreme Ultra Violet Channel (part of UVIS)
EVA	Extra Vehicular Activity
EVEEGA	Earth-Venus-Earth-Earth Gravity Assist
Ext	External
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--F--
F2	Fluorine
FA	Flight Acceptance
FA	Formal Agreement
Fab	Fabrication
FAC	Facility
FAR	Flight Acceptance Review
FARM	Frame Acceptance and Reporting Mechanism
FASTSIM	High-speed Simulator
FC	Faraday Cage
FCB	Facility Control Building
FDD	Functional Design Document
FDS	Fine Digital Sun Sensor
FEM	Finite Element Model
FEN	Field-Equivalent-Noise
FEOT	Facility Experiment Operations Team
FET	Field Effect Transistor
FFT	Fast Fourier Transform
FGM	Flux Gate Magnetometer
FGM	Vector Fluxgate Magnetometer
FH	Filter Hybrid
FHDF	Flight Hardware Development Facility
FI	Facility Instrument
FIFO	First In / First Out (data memory)
FIM	Facility Instrument Manager
FIR	Far Infrared
FIRDR	Final Interface Requirements and Design Review
FIS	Flight Instrument System
FIST	Facility Instrument Science Team
FIT	Flight Investigation Team
Flt	Flight
FLT-SP	Flight-Spare
FM	Flight Model
FM	Frequency Modulation
FMEA	Failure Mode Effects Analysis
FMECA	Failure Mode Effects & Criticality Analsysis
FMH	Free Molecular Heating
FO	Flight Observable
FOM	Figure of Merit
FOP	Flight Operations Plan
FORS	Fiber Optic Rotation Sensor
FOS	Factor of Safety
FOV	Field of View (instrument)
FP	Fault Protection
FP	Flight Project
FP	Focal Plane
FPA	Focal Plane Array
FPA	Focal Plane Assembly
FPGA	Field Programmable Gate Array
FPO	JPL Flight Projects Office
FPP	Fields and Particles Pallet
FPP	Flight Project Practice
FPR	Flight Performance Reserve
FPSG & R	Flight Projects Safety Guide and Requirements
FPSO	Flight Project Support Office
FPW	Fields, Particles, and Waves
FPWI	Fields/Particles/Waves, INMS
FR	Failure Report
FR	Functional Requirements
FRD	Functional Requirement(s) Document
FRG	Federal Republic of Germany
FRR	Functional Readiness Review
FRSS	Front Shield Subsystem
FS	Flight System
FSAR	Final Safety Analysis Report
FSDS	Flight Software Development System
FSO	Flight System Operations
FST	Facility Science Team
FSTB	Flight Software Test Bed
FSW	Flight Software
FTA	Fault Tree Analysis
FTE	Full Time Equivalent
FTP	File Transfer Protocol
FTS	Flight Termination System
FTS	Fourier Transform Spectrometers
FUV	Far Ultraviolet
F/W	Firmware
FWMH	Full Width at Half Maximum
FY	Fiscal Year
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--G--
GaAs	Gallium Arsenide
GCF	Ground Communications Facility
GCMD	Ground Command File
GCMS	Gas Chromatograph and Mass Spectrometer
gd	Gadolinium
GDD	General Design Document
GDS	Ground Data System
GDSCC	Goldstone Deep Space Communications Complex
GDSE	Ground Data System Engineer
Ge	Germanium
GFE	Government(or JPL) Furnished Equipment
GFP	Government Furnished Property
GHE	Gaseous Helium
GHz	Gaseous Nitrogen
GHz	Gigahertz
GIF	GCF Interface (Subsystems)
GL & Cs	Guidelines and Constraints
GLL	Galileo
GMT	Greenwich Mean Time
GN2	Gaseous Nitrogen
GPHS	General Purpose Heat Source
GPIB	General Purpose Interface Bus
GPS	Global Positioning System
GRS	Gamma Ray Spectrometer
GS	Ground System
GSCCB	Ground System Change Control Board
GSDM	Ground System Development Manager
GSE	Government Supplied Equipment
GSE	Ground Support Equipment
GSFC	Goddard Space Flight Center
GSO	Geo-Stationary Orbit
GSOM	Ground System Operations Manager
GSRR	Ground System Readiness Review
GSSE	Ground Software System Engineer
GSW	Ground Software
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--H--
h	Hexadecimal
HASI	Huygens Atmospheric Structure Instrument
HCD	Hardware Command Decoder
HCP	Hardware Command Program
HCS	High Speed CMOS (silicon on sapphire)
HDAC	Hydrogen/Deuterium Absorption Cell
HDB	Huygens Data Base
He	Helium
HEF	High-Efficiency
HEF	High-Eficiency DSN Station
HELV	Helium Latch Valve
HeLVD	Helium Latch Valve Driver
HEO	High Earth Orbit
HEXFET	Hexagonal Field Effect Transistor (Trademark of International Rectifier)
hFE	Transistor dc gain
HGA	High-Gain Antenna
HK	Housekeeping
HK	Housekeeping Data (instrument engineering key parameters)
HL	High Level
HMCS	Huygens Monitor and Control System
HOL	High Order Language
HP	Hewlett-Packard
HP	High Pressure
HPD	Hot Plasma Detector
HPF	Hazardous Processing Facility
HPLV	High Pressure Latch Valve
HPOC	Huygens Probe Operations Center (at ESOC)
HPSP	High Precision Scan Platform
HQ	Headquarters
HRCR	Hardware Requirements and Certification Review
HRD	High Rate Detector
HSK	Houskeeping
H-S SIM	High-speed Simulator
HSP	High Speed Photometer
HSR	Hardware Safety Review
HSWT	Huygens Science Working Team (Titan Probe)
HTA	Helium Tank Assembly
HTR	Heater
HUY	Huygens Probe
HV	High Voltage
HV	High Voltage Power Converter
HVPS	High Voltage Power Supply
HVU	High Voltage Unit
HW	Hardware
H/W	Hardware
Hz	Hertz
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--I--
IAA	Inter-Agency Agreement
IA/LP	Ion Analyzer/Langmuir Probe
IBS	Ion Beam Spectrometer (Part of CAPS)
IC	Imperial College
IC	Instrument Coordinator
IC	Integrated Circuit
IC	Internal Combustion
ICA	Inventory Change Authorization
ICCB	Interface Change Control Board
ICD	Interface Control Document
ICD	Interface Control Drawing
ICDS	Interface Circuit Data Sheet
ICR	Instrument Confirmation Review
ICV	Inter-Center Vector
ID	Interface Document
IDR	Intermediate Data Record
IDRSPS	Intermediate Data Records Stripper Processing System
IDS	Interdisciplinary Scientist (or Science)
IDSRD	Investigation Description & Science Requirements Document
IDST	Instrument Development Science Team
IDT	Instrument Development Team (for facility instruments)
IDTL	Instrument Development Team Leader
IE	Instrument Engineer
IEB	Instrument Expanded Block
IESD	Internal Electrostatic Discharge
I/F	Interface
IFM	Interface Module
IFOV	Instantaneous Field of View
IFRB	Interface Failure Review Board
IK	'I' Kernel (Instrument Information in the NAIF SPICE system)
ILAN	Instutional Local Area Network
IM	Injection Margin
IMP	Interface Management Plan
IMS	Ion Mass Spectrometer (Part of CAPS)
INCA	Ion and Neutral Camera (Part of MIMI)
IND	Indication
INMS	Ion and Neutral Mass Spectrometer
INMS	Ion and Neutral Mass Spectrometer Subsystem
InSB	Indium Antinomide
Instr	Instrument
Int	Integration
INU	Inertial Navigation Unit (Centaur)
I/O	Input/Output
IO	Instrument Office
IOM	Interoffice Memorandum
I/P	Input
IP	Implementation Plan
IPSD	Interface Planning and Scheduling Document
IR	Infrared
IRD	Interface Requirements Document
IRE	Inertial Reference Electronics
IRI	Ineertial Reference Interface
IRU	Inertial Reference Unit
IS	Investigation Scientist
ISA	Incident Surprise Anomaly Report
ISB	Intra System Bus
ISFD	Integrated Software Functional Design
ISFD	Integrated Software Functional Diagram
ISFRD	Instrument System Functional Requirements Document
ISLR	Integrated Sidelobe Ratio
ISOE	Integrated Sequence of Events
ISP	Specific Impulse (in seconds)
ISS	Imaging Science Subsystem
ISS NAC	Imaging Science Subsystem, Narrow Angle Camera
ISS WAC	Imaging Science Subsystem, Wide Angle Camera
IST	Imaging Science Team
IST	Institutional Support Team
IST	Integrated System Test
ISTS	Inner Structure Subsystem
IT	Integrated Timeline
I&T	Integration and Test
ITL	Integration Test Laboratory
ITO	Indium Tin Oxide
IUS	Inertial Upper Stage
IVP	Inertial Vector Propagator
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--J--
JFET	Junction Field Effect Transistor
JGA	Jupiter Gravity Assist
JPL	Jet Propulsion Laboratory
JSC	Johnson Space Center
JSWG	Joint Science Working Group
JWG	Joint Working Group
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--K--
K	Boltzmann's constant
Ka=	La-Band Uplink
Ka-Band	Radio frequencies beween 26 and 40 GHz
KaO	Ka-Band Downlink
KAT, Ka-Tr	Ka-Band Transiator
Ka-TWTA	Ka-Band Traveling Wave Tube Amplifier
KEX, Ka-EX	Ka Band Exciter
kHz	Kilohertz
KPT	Kinematics Prediction Tool
KSC	Kennedy Space Center
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--L--
L	Launch
LA	Launch Approval
LAN	Local Area Network
LANL	Los Alamos National Laboratory
LASP	Laboratory for Atmospheric and Space Physics
LCE	Launch Complex Equipment (A Voyager Science Instrument)
LCP	Left Circular Polarization
LCP	Left-Hand Circularly Polarized
LECP	Low Energy Charge Particle Subsystem (A Voyager Science Instrument)
LED	Light-emitting diode
LEM	Lower Equipment Model
LEMMS	Low Energy Magnetospheric Measurement Subsystem (Part of MIMI)
LEO	Low Earth Orbit
LeRC	Lewis Research Center
LET	Linear Energy Transfer
LFE	Low Frequency Electronics
LFH	Low Frequency Magnetic
LF&S	Launch Facilities and Support
LGA	Low Gain Antenna
LGA1	Low Gain Antenna-1
LGA 1	Low Gain Antenna 1
LHCP	Left Hand Circular Polarization
LILT	Low Intensity, Low Tempeature
LNA	Low Noise Amplifier
LO	Local Oscillator
LP	Langmuir Probe
LPLV	Low Pressure Latch Valve
LPPP	Low Precision Pointing Platform
LRD	Lightning and Radio Emission Detector
LRR	Launch Readiness Review
LSA	Linear Seperation Assembly
LSB	Least Significant Bit
LSI	Large Scale Intgrated (electronics chip)
LSW	Least Significant Word
LTL	Laser Time Line
LTS	Laboratory Test Set
LV	Latch Valve
LV	Launch Vehicle
L/V	Launch Vehicle
LVA	Launch Vehicle Adapter
LVC	Launch Vehicle Contingency Reserve
LVDT	Linear Variable Differential Transformer
LVMP	Launch Vehicle Mission Peculiar
LVPS	Low Voltage Power Supply
LVS	Launch Vehicle System
LWRHU	Light Weight Radioisotope Heater Unit
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--M--
mA	Milli-Amp
MAC	Magnetometer Alignment Coil
MAC	Mass Acceleration Curve
MAG	Dual Technique Magnetometer
MAG	Magnetic Field Investigation
Mag	Magnetics
MAG	Magnetometer
MAG	Magnetometer Subsystem
MAP	Mission Activity Profile
MAPEX	Map Expansion (Channelization)
MAPS	Magnetospheric and Plasma Science (working group)
max	Maximum
Mb	Magabits
MBI	Multi-Beam Imaging Radar (A RADAR mode)
MC	Map Compiler (Creates Docommutation Map)
MCC	Magnetometer Calibration Coil
MCDS	Multi-Interface Circuit Data Sheet
MCP	Microchannel Plate
MCS	Multimission Command System
MDDA	Mini Dual Drive Actuator
MDE	Mechanism Drive Electronics
MDP	Maximum Design Pressure
MDP	Mission Design Panel
MDSCC	Madrid Deep Space Communications Complex
MDU	Master Data Unit (Centaur)
ME	Main Electronics
ME	Main Engine
MEA	Main Electronic Assembly
MEA	Main Engine Actuator
MEA	Main Engine Assembly (includes gimbals)
MEBP	Main Engine Base Plate
MECO	Main Engine Cutt Off
MES	Main Engine Start
MET	Mission Elapsed Time
MEV	Main Engine Valve
MEVD	Main Engine Valve Driver
MFILE	Mnemonic Command File
MFG	Manufacturer
MGDS	Multimission Ground Data System
MGL	Minimum Gain Level
MGN	Magellan
MGSE	Mechanical Ground Support Equipment
MHD	Magneto-Hydrodynamic
MHW	Multi-Hundered Watt
MHz	Mega-Hertz; frequencies in millions of cycles/sec
MICD	Mechanical Interface Control Drawing
MIF	Micrometeoroid Induced Failure
Mil	.001 inch (.0254 mm)
MIL	Merritt Island DSS Complex
MILA	Merritt Island Launch Area
MIL-STD	Military Standard
MIMI	Magnetospheric Imaging Instrument Subsystem
MIMI CHEMS	Magnetospheric Imaging experiment, Charge-Energy-Mass Spectrometer
MIMI LEMMS	Magnetospheric Imaging Experiment, Low Energy
Min	Minimum
MIP	Mission Integration Panel
MIPL	Multi-mission Image Processing Lab
MIPS	Million Instructions Per Second
MIPS	Multimission Image Processing System
MIR	Mid Infrared
MIRIS	Modified Infrared Interometer Spectrometer and Radiometer (A Voyager Science Instrument)
MLI	Multi-Layer Insulation
MM	Mission Module
MMAC	Multi Mass Acceleration Curve
MMC	Martin Marietta Corporation
MMDMT	Multi-Mission Data Mgmt Team
MMECDR	Multimission Expanded Channelized Data Record
MMH	Monomethyl Hydrazine
MMII	Mariner Mark II
MNOS	Metal Nitride Oxide Semiconductor
MOA	Memorandum of Agreement
Mod	Module
MO&DA	Mission Operations and Data Analysis phase
MODB	Mission Operations Data Base
MON	Mixed Oxides of Nitrogen - Bipropellant Oxidizer
Monte Carlo	Statistical simulation technique used to analyze random or probabilistic proceeds
MOP	Maximum Operating Pressure
MOPS	Maneuver Operations Program
MOR	Mission Operations Review
MOS	Metal Oxide Semiconductor (devices)
MOS	Mission Operations System
MOSFET	Metal Oxide Semiconductor Field Effect Transistor
MOSO	Multimission Operations System Organization
MOU	Memorandum of Understanding
MP	Mission Plan
MP	Multiplier
MPD	Mono-propellant Driver
MPI	Max Planck Institute
MPI/K	Max Planck Institute for Kernphysik
MPLV	Monopropellant Tank Assembly
MPS	Memory Power Subassembly
MPT	Mission Planning Team
MPVT	Mission Planning Virtual Team
Mrad	Milliradians (Equivalent to 1 x 10-3 radians [1? = 17.45 mrad])
MRB	Material Review Board
MRD	Mission Requirements Documents
MRR	Mission Requirements Request
MRRD	Mission Requirements Reference Docuemnt
mS	Millisecond
MSA	Mission Support Area
MSAR	Microwave Spectrometer and Radiometer
MSAS	Multimission Spacecraft Analysis Subsystem
MSB	Most Significant Bit
MSC	Magnetic Search Coil
MSC/LP	Magnetic Search Coil/Langmuir Probe
Msec	.001 second
MSI	Medium Scale Integration
MSPSA	Missile Sys. Prelaunch Safety Approval
MSPSP	Missile Safety Prelaunch Safety Package
MSS	Mechanisms Subsystems
MSS	Mission Sequence Subsystem
MSSL	Mullard Space Science Laboratory
MSSO	Mission Support & Service Office
MSTI	Miniature Seeker Technology Integration
MSW	Most Significant Word
MTA	Monopropellant Tank Assembly
MTBF	Mean time between failures
MTF	Modulation Transfer Function
MTS	Mission Telemetry System
mV	Milivolt
mW	.001 Watt
mrad	Microradians (Equivalent to 2 x 10-6 radians)
ms	Microsecond (.000001)
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--N--
N	Newton
n,#	number of, or number
NA	Narrow Angle
NA	Not Applicable
N/A	Not Applicable
N/A	Not Available
NAC	Narrow Angle Camera (Part of ISS)
NACE	Narrow Angle Camera Electronics
NACH	Narrow Angle Camera Head
NAIF	Navigation Ancillary Information Facility
NASA	National Aeronautics and Space Administration
NASCOM	NASA Communications Network
Nav	Navigation
NAV	Navigation Team
NBS	National Bureau of Standards
NCASE	Number of long-term Monte Carlo cases (initial trajectory states at spacecraft failure times)
NCH	Narrow Angle Camera Head
NCI	Narrow Angle Camera Interface
NCRX	Number of Earth torus crossings encountered in all long-term Monte Carlo cases
NDE	Non-Destructive Evaluation
NEA	Noise Equivalent Angle
NEI	Non Explosive Initiator
NEP	Noise Equivalent Power
NEP	Nuclear-Electric Population
NEPA	National Environmental Policy Act
NERT	Near Real Time
NESR	Noise Equivalent Spectral Radiance
NGA	Non-gravitational accelerations
NGIMS	Neutral Gas and Ion Spectrometer
N2H2	Hydrazine
NHB	NASA Handbook
NIMS	Near Infrared Mapping Spectrometer Subsystem
NIRS	Near Infrared Spectrometer
NLS	National Launch System
NMI	NASA Management Instruction
NMOS	N-Channel Metal Oxide Semiconductor
NOCC	Network Operations Control Center
Nom	Nominal
Non-oper	Non-operating
NP	Navigation Plan
NR	Navigation Requirements
NRZ	Non-Return-to-zero
NSI	NASA Science Internet
NSI	NASA Standard Initiators
NSO	Nuclear Safe Orbit
NSSDC	National Space Science Data Center (at Goddard)
nT	nano Tesla
NTO	Nitrogen Tetroxide
NTO	Nitrogen Tetroxide - Bipropellant Oxidizer
NVR	Non-Volatile Residue
NXT	NASA Standard-X-Band Transponder
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--O--
O	Optional
OACT	NASA Office of Advanced Concepts and Technology
OBDH	On-Board Data Handling
OCT	Operations Control Team
OD	Orbit Determination
OD	Outer Diameter
ODM	Orbit Deflection Maneuver
ODP	Orbit Determination Program
ODR	Original Data Record
ODT	Orbiter Delay Time
OED	Orthogonal Electric Dipoles
OIA	Operational Interface Agreement
OMP	Observatoire Midi-Pyr�n�es/Midi-Pyr�n�es Observatory (Toulouse, FR)
OMSC	Orthogonal Magnetic Search Coils
ONIPS	Optical Navigation Image Processing System
ONP	Optical Navigation Program
O/P	Output
OPA	Optics Assembly
OP AMP	Operational Amplifier
OPE	Orbiter Purge Equipment
Oper	Operating
OPNAV	Optical Navigation
Ops	Operations
OPTG	Orbit Propagation and Timing Geometry File
Orb	Orbiter
ORS	Optical Remote Sensing
OSC	NASA Office of Space Communications
OSF	NASA Office of Space Flight
OSP	Orbit Specific Plan
OSS	Office of Space Science
OTL	Operational Team Lead
OSSA	Office of Space Science and Applications (of NASA)
OSSI	JPL Office of Space Science and Instruments
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--P--
P	Perihelion
P	Pressure
P	Proposal
PA	Product Assurance
PAA	Probe Aspect Angle
PAD	Project Authorization Document
PA&I	Planning, Assessment and Integration
PAIO	Planning, Assessment and Integration Office
PAL	Programmable Array Logic
PAM	Payload Assist Module
PAM-S	Payload Assist Module-Special
Pb	Lead
PB	Playback
PB	Repaired By
PC	Personal Computer
PC	Power Control, Chamber Pressure
PCA	Power Control Assembly
PCA	Power Converter Assembly
PCA	Pressurant Control Assembly (part of PMS)
PCC	Photoconductive
PCCB	Project Change Control Board
PCD	Project Change Directive
PCE	Power Conditioning Equipment
PcK	Planet Physical and Cartographic Constraints (in the NAIF SPICE system)
PcK	Spice file containing a selected set of physical and cartographic constants
PCM	Pulse-Code Modulation
PCR	Project Capability Review
PCU	PowerConversion Unit
PD	Project Document (Documentation)
PDA	Power Distribution Assembly
PDB	Project Data Base
PDD	Program Design Document
PDF	Probability Density Function
PDMP	Project Data Management Plan
PDR	Preliminary Design Review
PDRS	Probe Data Relay Subsystem
PDS	NASA Planetary Data System
PDS	Project Data System
PDT	Pointing Design Tool
PEF	Predicted Event File
PENL	Comet Penetrator Lander
pF	picoFarad
PF	Protoflight
Pfd	Picofarad
PF(i)	Probability of failure for the ith failure mode
PFM	Protoflight Model
PFR	Problem/Failure Report (A JPL Form)
P/FR	Problem Failure Report
PFU	Protoflight Unit
PHSF	Payload Handling and Servicing Facility
PHSS	Probe Harness Subsystem
PI	Principal Investigator on a PI/Instrument Investigation
PI	Probability of Earth impact
PIA	Propellant 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
PIO	Public Information Office
PIRDR	Preliminary Interface Requirements and Design Review
PIRLS	Probe IR Laser Spectrometer
PLD	Programmable Logic Drive, or Payload
PLF	Payload Fairing
PLL	Phase-Locked Loop
PLPP	Pre (or Post) Launch Planetary Protection Report
PLS	Plasma Spectrometer
PM	Project Manager
PMA	Propulsion Module Assembly
PMC	Probe Mission Complete (Completion)
PMD	Propulsion Management Device
PMR	Project Management Report
PMS	Performance Management System
PMS	Power Management System (in MAG)
PMS	Propulsion Module Subsystem
PMSEA	Propulsion Module Subsystem, Electronics Assembly
PMT	Photo Multiplier Tube
PNR(i)	Probability of no recovery given the failure mode and the time of impact
POC	Probe Operations Center
POE	Probe Orbiter Earth Angle
POR	Power On Reset
POSW	Probe On-Board Software
PP	Project Plan
PPF	Payload Processing Facility
PPF/HPF	Payload Processing Facility/Hazardous Processing Facility
ppm	Parts per Million
PPO	Pressed Plutonium Oxide
PPP	Planetary Protection Plan
PPRD	Project Policies & Requirements Document
PPS	Power & Pyrotechnics Subsytem
PPSS	Power & Pyrotechnic Subsystem Simulator
PRA	Planetary Ranging Assembly
PRA	Probe Relay Antenna
PRB	Huygens Probe
Prb	Probe
PRD	Program Requirements Document
PRI	Pulse Repetition Interval
PRL	Probe Relay Link
PRM	Periapsis Raise Maneuver
PRM	Probe Release Maneuver
PROM	Programmable Read-Only Memory
Propul	Propulsion
PRR	Project Requirements Review
PRT	Platinum Resistance Thermometer
PRWS	Plasma and Radio Wave Spectrometer
PS	Participating Scientist
P/S	Power Supply
PS	Project Scientist
P & S	Planning and Sequencing
PSA	Probe Support Avionics
PSCFL	Preliminary safety critical function list
PSCN	Probe Support Communications Network
PSE	Probe Support Equipment
PSG	Project Science Group
psi	Pounds per Square Inch
PSIG	Pounds per square inch gauge (pressure)
PSK	Phase-Shift Keying
PSL	Project Software Library
PSR	Project Status Review
PSS	Probe Support Subsystem
PSSR	Plasma Spectroscopy/Sounder Receiver
PST	PI Science Team
PSU	Pyro Switching Unit
PSU	Power Supply Unit
PTM	Probe Targeting Maneuver
PTM	Proof Test Model
Pu	Plutonium
Pu-238	Plutonium-238
PV	Photovoltaic
PVDF	Polyvinlydene Flouride
PWA	Plasma Wave Analyzer
PWB	Printing Wiring Board
Pwr	Power
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--Q--
QA	Quality Assurance
QAI	Quality Assurance Instruction
QC	Quality Control
QFD	Quality Function Deployment
QFS	Qualification & Flight Spare
QL	Quick Look
Qty	Quantity
Qual	Qualify (Qualification)
QQC	Quantity, Quality, and Continuity
Qty	Quantity
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--R--
RACS	Radiation Analysis Completion Statement
RAD	Absorbed radiation in Silicon
Rad	Radiation effect on a part
RAD	Radio Science
RADAR	Cassini Radar Subsystem
RAM	Random Access Memory
RAR	Risk Assessment Review
RAS	Radar Altimeter Science
R-Axis	Along the anti-sun line
RCP	Right-Hand Circularly Polarized
R/CR	Review/Certification Requirements
RCS	Reaction Control Subsystem
RCT	Reaction Control Thruster
RCVR	Receiver
RD	Reference Document
RDD	Release Description(s) Document
RDM	Radiation Design Margin
RDR	Reduced Data Record
REA	Rocket Engine Assembly
Rel	Release
Req	Requirement
REU	Remote Engineering Unit
RF	Radio Frequency
RFE	Radio Frequency Electronics
RFE	Receiver Front End (LNA/Diplexer)
RFEA	Radio Frequency Electronics Assembly
RFES	Radio Frequency Electronics Subsystem (Part of RADAR)
RFI	Radio Frequency Interference
RFIS	Radio Frequency Instrument Subsystem
RFS	Radio Frequency Subsystem
RFSTLC	RFS Tracking Loop Capacitor
RHCP	Right Hand Circular Polarization
RHU	Radioisotope Heater Unit
RIMS	Retarding Ion Mass Spectrometer
RITO	Refraction Index of Titan Ocean
RJ	Jupiter Radii
RJ	Radius of Jupiter
R_J	Radius of Jupiter
RLPSE	Remote Launch Pad Support Equipment
RMS	Root Mean Square
RODS	Remote Operating Data System
ROE	Real-Time Operations Element
ROM	Read Only Memory
ROM	Rough Order Magnitude
RORSAT	Radar Ocean Reconnaissance Satellite
RP	Radio Propagation
RPA	Retarding Potential Analyzer
RPA/LP	Retarding Potential Analyzer/Langmuir Probe
RPC	Ring Plane Crossing
RPF	Resource Prediction File
RPM	Revolution Per Minute
RPWS	Radio and Plasma Wave Science Subsystem
R&QA	Reliability and Quality Assurance
RRL	Radio Relay Link
RS	Radio Science Investigation
RS	Radius of Saturn
R_S	Radius of Saturn
R-S	Reed-Solomon Encoding Method
RS	Saturn Radii
RSDL	Read-Solomon Downlink
RSP	Remote Sensing Pallet
RS & QA	Reliability, Safety & Quality Assurance
RSS	Radio Science Subsystem
RSS	Root Sum Squares
RST	Radio Science Team
RT	Remote Terminal
RT	Real Time
R/T	Real-Time
R-T	Real-time
RTD	Resistive Thermal Device
RTDT	Remote Terminal Descriptor Table
RTG	Radioisotope Thermionic Generator
RTI	Real Time Interrupt
RTI	Real Time Interval
RTIU	Real Time Interface Unit
RTIU	Remote Terminal Interface Unit
RTO	Real Time Operations
RUSO	Receiver Ultra Stable Oscillator (USO)
RVF	Resource Verification File
RW	Reaction Wheel
RWA	Reaction Wheel Assembly
RWE	Reaction Wheel Electronics
RWI	Reaction Wheel Interface
RWM	Reaction Wheel Mechanism
RWX	Reaction Wheel Extension
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--S--
S	Second
S/A	Safe-Arm Circuit
SA	System Administrator
S & A	Safe and Arm
SAE	Safety Engineer
SAEF	Spacecraft Assembly and Encapsulation Facility (at KSC)
SAF	Spacecraft Assembly Facility (JPL Bldg. 179)
SA File	Science Activities File
SAH	System Assembly Hardware
SAM	Saturn Atmosphere Mapper
SAM	SCR Approval Meeting
SAM	Spectrum Analyzer Module
SAM-RC	Structures and Materials Safety Review Committee
SAPE	Science and Project Engineering
SAR	Safety Analysis Report
SAR	Synthetic Aperture Radar (A RADAR Model)
SASF	Spacecraft Activity Sequence File
SASW	Support Avionics Software
SAT	Device to be Selected-at-Test
SAT	Select-at-Test
S-Band	Radio Frequencies between 2 and 4 GHz
SBP	PD 699-511 Cassini Flight/Ground Software Capabilities Build Plan
SBT, S-Band	TxS-Band Transmitter
SC	Science Coordinator
SC	Spacecraft
S/C	Spacecraft
SCAS	Science Calibration Subsystem
SCAT	Nadir-looking Scatterometer, A RADAR mode
SCCS	Source Code Control System
SCDT	Spacecraft Design Team
SCET	Spacecraft Event Time
SCFL	Safety critical function list
Sci	Science
SCI	Science Subsystem
SCI	Science Teams
SCLK	Spacecraft Clock
SCI & MP	Science & Mission Planning
SCM	Software Configuration Manager
SCMG	Software Configuration Management Group
SCML	System Configuration Management Library
SCMP	Software Configuration Management Plan
SCMS	System Configuration Management Subgroup
SCO	Spacecraft Office
SCOE	Special-purpose checkout equipment
SCR	Silicon Controlled Rectifier
SCR	Software Change Request
SCR	Sequence Change Request
SCS	Spacecraft System
SCSI	Standard Computer System Interface
SCT	Spacecraft Design Team
SCT	Spacecraft Team
SCU	Sequence Control Unit (on Centaur)
SDD	Software Design Document
SDD	System Design Document
SDF	Supplementary Data File
SDG	System Design Group
SDR	Software Design Review
SDT	Sequence Design Team
SE	Support Equipment
SE	System Engineer
SEB	Single Event Burnout
SEC	Second
SE & C	System Engineer and Coordination
SED	Saturn Electrostatic Discharge(s)
SED	Spin/Eject Device
SEDR	Supplementary Experiment Data Record
SEE	Single Event Effects (upsets, latchups and burnouts)
SEEGA	Solar-Electric Earth Gravity Assist
SEF	Spacecraft Events File
SEFH	Standard Cubic per Hour
SEG	Sequence of Events Generation
SEGR	Single Event Gate Rupture
SEI	Software Engineering Institute
SEL	Single Event Latchup
SEMPA	Scanning Electron Microscope and Particle Analyzer
Sep	Separation
SEP	Solar-Electric Propulsion
SEPS	Separation Subsystem
Seq	Sequence
SEQGEN	Sequence Generator
SEQTRAN	Sequence Translator
SEU	Single Event Upset
SFDU	Standard Formatted Data Unit
SFDUGUI	SFDU Graphical User Interface
SFOC	Space Flight Operations Center
SFOP	Space Flight Operation Plan
SFOS	Space Flight Operations Schedule
SFT	System Functional Test
SHE	Sensor Head Electronics
SI	Science Instruments
Si	Silicon
SIE	Sequence Integration Engineer
Sig	Signal
SIM	Science Instrument Manager
SIMS	Secondary Ion Mass Spectrometer
SINDA	Systems Improved Numerical Differencing Analyzer
SIPS	Science Instrument Purge Subsystem
SIRD	Support Instrumentation Requirement Document
SIS	Software Interface Specification
SIT	Science Integrated Timeline
SITM	Spacecraft Integration & Test Manager
SITP	Subsystem Integration & Test Plan
SKR	Saturn Kilometric Radiation
SKR	Saturn Kilometric Radio Emission
SL	Selection Letter
SLATS	Solar Linear Array Technology System
SLOC	Source Line of Code
SLT	System Level Testing (Any testing while the instrument is installed on the spacecraft)
SM	Section Manager
SMD	Science and Mission Design Office
SMDC	Shielded Mild Detonating Cord
SMP	Software Management Plan
SMR	Software Management Review
SN	Serial Number
SNR	Signal-to-Noise Ratio
SNR	Signal-TV-Noise Ratio
SO	S-Band Downlink
SO	Science Operations
SOA	Science Opportunity Analyzer
SOD	Science Observation Design
SODB	Science Operations Data Base
SOE	Sequence of Events
SOH	Safety Operations Handling Document
SOI	Saturn Orbit Insertion
SOIRD	Spacecraft Operations Interface Req. Document
SOI/SOS	Silicon-on-Insulator, Silicon-on-Sapphire
SOP	Standard Operating Procedure
SOP	Science Operations Plan
SOPC	Science Operations and Planning Computer
SOST	Satellite Orbiter Science Team
SOU	RADAR Sounder mode
SOW	Statement of Work
SP	Safety Plan
SP	Sequence Program
SP	Science Planning
SPA	Software Product Assurance
SPAE	Software Product Assurance Engineer
SPAP	Software Product Assurance Plan
SPAPS	Subsystem Parts Allocation Planning Summary
SPASE	Software Product Assurance System Engineer
SPC	Science Programme Committee of ESA
SPC	Signal Processing Center
SPDT	Single Pole Double Throw
SPE	Signal Processing Electronics
SPE	Sun Probe-Earth Angle
SPECT	Spectrometer
SPF	Single Point Failure
SPICE	Information System Produced by the NAIF Team
SPICE	Spacecraft, Planet, Instruments, C-matrix, and Events kernels
SPICE	Superthermal Plasma Investigation of cometary Environments
SPICE	The set of ancillary information in the NAIF system
SPK	Spacecraft and/or Celestial Body File
SPK	Spacecraft and Planet ephemeris data file (Kernel)
SPOT	Science Planning and Operations Team
SPP	Sequence Planning Preview
SPRL	Space Physics Research Laboratory (University of Michigan)
SPS	Spacecraft Purge Subsystem
SPT	Specific Performance Test
SPVT	Science Planning Virtual Team
SQR	Spacecraft Qualification Review
SR	Safety Review
SR	Shunt Radiator
SR-90	Strontium-90
SRA	Shunt Regulator Assembly
SRCR	Software Review Certification Requirement(s)
SRD	Science Requirement(s) Document
SRDD	Software Release Description Document
SRE	Subsystem Reliability Engineer
SRM	Solid Rocket Motor
SRMU	Solid Rocket Motor Upgrade
SRR	Software Requirements Review
SRRD	Science Requirements Reference Document
SRTG	Simulated Radioisotope Thermoelectric Generator
SRU	Stellar Reference Unit
S/S	Subsystem
SS	Sun Sensor
SSA	Sun Sensor Assembly
SSAC	Space Science Advisory Committee of ESA
SSAK	Second surface aluminized kapton
SSAN	Space Science and Applications Notice
SSASC	Space Science and Applications Steering Committee
SSCCB	Spacecraft System Change Control Board
SSD	Software Specifications Document
SSD	Solid State Detector
SSDPS	Solar System Data Processing System
SSE	Software System Engineer
SSE	Sun Sensor Electronics
SSEC	Solar System Exploration Committee (A committee of the NASA Advisory Council)
SSEF	Spacecraft Significant Events File
SSH	Sun Sensor Head
SSHA	Software Specification and Procedures Manual
SSHA	Sun Sensor Head Assembly
SSM	Spacecraft System Manager
SSM	System Software Manager
SSO	Sun-Synchronous Orbit
SSO	Systems Safety Office
SSP	Surface Science Package
SSPM	Software Specification and Procedures Manual
SSPS	Solid State Power Switch
SSR	Solid State Recorder (spacecraft data storage device)
SSUP	Science Sequence Update Process
SSYSF	Subsystem Fail Flag
ST	Standard JPL Specification
STATRJ	Station Polynomial File
STC	System Test Complex
STD	Standard
STD	Standard DSN Station
STE	System Test Equipment
STM	Safe-To-Mate
STOR	System Test Operations Report
STP	Software Test Plan
STP	Solar Thermal Population
STPM	Structural/Thermal/Pyro Model
STRU	Structure Subsystem
STS	Space Transportation System (Shuttle)
STSE	System Test Support Equipment
STV	Solar Thermal Vacuum
SV	Space Vehicle
SVDS	Satellite Vehicle Destruct System
SVDS	Space Vehicle Destruct System
SVS	Simulation and Verification Services
SVT	Sequence Virtual Team
SVTL	Sequence Virual Team Lead
SW	Software
S/W	Software
SW CE	Software Cognizant Engineer
SW Cog E	Software Cognizant Engineer
SWDR	Software Design Review
SWG	Science Working Group
SWI&T	Software Integration & Test
SwRI	Southwest Research Institute
SWRR	Software Requirements Review
SW TE	Software Test Engineer
SW TM	Software Technical Manager
SWVDR	Software Version Delivery Review
SYS	Simulation & Verification Services
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--T--
T	Tesla
Ta	Tantalum
TAG	Test Agency
TAP	Technology and Applications Program
TAR	Tape Archive (Utility)
T-AXIS	N cross R
TB	Test Bed
TBC	To Be Confirmed
TBC	Test Bed Converter
TBD	To Be Determined (or Defined)
TBR	To Be Resolved
TBR	To Be Reviewed
TBS	To Be Supplied
Tc	Temperature Coefficient/Correction Factor
T/C	Temperature Control
TCA	Thruster Cluster Assembly
TCA	Time of Closest Approach
TCD	Trajectory Characteristics Document
TCDM	Telemetry Command/Data Mgmt.
TCM	Temperature Control Model
TCM	Trajectory Correction Maneuver
TCP/IP	Transmission Control Protocol/Internet Protocol
TCS	Telecommunications Subsystem
TCPS	Titan IV/Centaur Purge Subsystem
TC STA	Test Conductor Station
TCU	Telemetry Control Unit (Part of RFS)
TDA	Office of Tracking and Data Acquisition (JPL)
TDC	Time to Digital Data Converter
TDL	Template Definition Language
TDM	Thermal Development Model
TDS	Telemetry Delivery System
TDS	Time Domain Sampler
TDS	Tracking & Data Acquisition System
TDS	Tracking and Data Services Element
TDS	Tracking and Data System
Temp	Temperature effect on a part
TEMP	Temperature Control Subsystem
TF	Transfer Frame
TFE	Tetrafluoroethylene (Teflon)
Th	Thorium
THSS	Thermal Control Subsystem
TIA	Team Interface Agreement
TID	Total Ionizing Dose
TIF	Telemetry Input System
Tim	Telemetry
TIP	Target Interface Point
TIR	Thermal Infrared Radiometer
TIREX	Thermal Infrared Radiometer Experiment
TIS	Telemetry Input System
TIV	Titan IV
TJ	Part Junction Temperature
TL	Facility Investigation Team Leader
TL	Team Leader (Facility Instrument)
TL	Thermoluminescence
TL	Timeline Plot
TLD	Thermoluminescent Dosimeter
TLM	Telemetry
TLM	Telemetry Modulation
TLV	Threshold Limit Value
TM	Technical Manager
TM	Team Member (Facility Instrument)
TM	Telemetry
TM	Temperature Multiplying Factor
TMC	Target Motion Compensation
TMM	Thermal Mathematical Model
TMOD	Telecommunications & Mission Operations Directorate
TMP	Telemetry Processor Module
TMU	Telemetry Modulation Unit
TO	Task Order
T & O	Test and Operations
T & OM	Test and Operations Manager
TOF	Time of Flight
TOF-LEF	Time of Flight - Linear Electron Field
TOF-ST	Time of Flight - Straight Through
TOL	Time Ordered Listing
TOL	Tolerance of a Part
TOP	Test Operations Plan
TOST	Titan Orbiter Science Team
TOT	Telemetry Output Tool
TP	Time of Periapsis
TPM	Telemetry Processor Module (REU portion of PMS)
TPM	Telemetry Propulsion Module
TPV	Thermophotovoltaic
TRACER	Tracing and Control of Engineering Requirements
TRK	Track
TRM	Titan Radar Mapper
TRSF	Test Results Summary Form
TS	Targeting Specification
TSP	Twisted Shielded Pair
TSR	Technical Status Review
TSR	Technical Support Representative
TSP	Twisted Shielded Pair
TSS	Telecommunications Subsystem
TST	Target & Star Tracker
TT	Turntable
TTACS	Test Telemetry & Command System
TT&C	Telemetry Tracking and Command
TTL	Transistor-Transistor Logic
TUB	Technical University of Braunchwieg
TUSO	Transmitter Ultra Stable Oscillator
TV	Thermal Vacuum
TVA	Thruster/Valve Assembly
TVC	Thrust Vector Control
TWNC	Two-way Nocoherent
TWT	Traveling Wave Tube
TWT	Target Working Team
TWTA	Traveling Wave Tube Amplifier
Tx	Transmitter
Typ	Typical
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--U--
U	Uranium
UARS	Upper Atmospheric Research Satellite
UCD	User Controlled Data Base
UDMH	Unsymmetrical Di-Methyl Hydrazine
UDS	Universal Documention System
UDT	Universal Daylight Time
UEM	Upper Equipment Module
UG	Microprocessor Software User's Guide
UG	User's Guide
UG/SOM	User's Guide/Software Operations Manual
U/L	Uplink
ULCER	Umbilical Lines Checker
ULO	Uplink Operations
ULS	Ulysses
UM	University of Michigan
Umb	Umbilical
UNA	Un-allocated
UOE	Uplink Operations Element
UP	Utility Program
UPAM	Uplink Package Approval Meeting
USAF	U. S. Air Force
USAR	Updated Safety Analysis Report
USM	Umbilical Separator Mechanism
USO	Ultra Stable Oscillator
USS	Upper Shell Structure
UT1	Universal Time
UTC	Universal Time Code
UTMC	United Technologies Microelectronics Center
UTPM	Universal Time and Polar Motion
UV	Ultraviolet
UV	Undervoltage
UVIS	Ultraviolet Imaging Spectrometer Subsystem
UVSI	Ultraviolet Spectrometr and Imager
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--V--
V	Volts
VAC	Volts Alternating Current
VC	Virtual Channel
VCCP	Virtual Channel Command Program
VCD	Verification Control Document
VCE	Visible Channel Electronics (Part of VIMS)
VCM	Volatile Condensible Material
VCO	Voltage Controlled Oscillator
VDC	Volts Direct Current
VDE	Valve Drive Electronics
VDECU	Valve Drive Electronics Control Unit
VDM	Valve Drive Module
VEEGA	Venus-Earth-Earth Gravity Assist (a trajectory tape)
VEGA	Venus-Earth-Gravity-Assist
VEJGA	Venus-Earth-Jupiter Gravity Assist (a trajectory type)
VGR	Voyager
VHM	Vector Helium Magnetometer
VI	Visual Editor
Vib	Vibration
VIMS	Visual and Infrared Mapping Spectrometer Subsystem
VIMS-IR	VIMS Infrared Channel
VIMS-V	VIMS Visible Channel
VLBI	Very Long Baseline Interferometry
VO75	Viking Orbiter
VOC	Volts Direct Current
VOL	Volume
VPF	Vertical Processing Facility
VRHU	Variable Radioisotope Heater Unit
V/SHM	Vector/Scalar Hellium Magnetometer
VSWR	Voltage Standing Wave Ratio
VVEGA	Venus-Venus-Earth-Gravity-Assist
VVEJGA	Venus-Venus-Earth-Jupiter Gravity Assist
VVVJGA	Venus-Venus-Venus-Jupiter-Gravity-Assist
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--W--
W	Tungsten (Wolfram)
WA	Wide Angle
WA	Wide Angle (Camera - Part of ISS)
WAC	Wide Angle Camera (Part of ISS)
WACE	Wide Angle Camera Electronics
WACH	Wide Angle Camera Head
WBS	Work Breakdown Structure
WCA	Worst Case Analysis
WC(A)	Worst Case (Analysis)
WCA	Worst Case (Circuit) Analysis
WCH	Wide Angle Camera Head
WCI	Wide Angle Camera Interface
WF/PC	Wide Field/Planetary Camera
WIP	Work Implementation Plan
W/m2	Watts per Square Meter
WOTU	Window on the Universe (MOSO's file access & transfer software)
WPA	Work Package Agreement
WRT	With Respect To
W.R.T.	With Respect To
WS	Workstation
WSE	Workstation Environment
WSMC	Western Space and Mission Center
WSMCR	Western Space and Missile Center Regulation
WT	Working Timeline
WTA	Wax Thermal Actuator
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--X--
XBA	Cross-Strap Bus Adapter (Part of CDS)
X-Band	Radio Frequencies between 8 and 12 GHz
XMTR	Transmitter
XSSA	X-Band Solid State Adapter (Part of CDS)
XSSA	X-Band Solid State Amplifier
XSSPA	X-Band Solid State Power Amplifier
XSTRP	Cross-Strap
X-TWTA	X-Band Traveling Wave Tube Amplifier
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--Z--
Z	Zulu Time (UTC). Used in PDS.
ZLP	Zero Length Packet
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