National Aeronautics and Space Administration

Acronyms

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AA OSMA	Associate Administrator, Office of Safety and Mission Assurance
AC	Alternating Current
ACCEL	Accelerometer
ACQ	Acquisition
ACS	Attitude Control System
ADC	Analog to Digital Converter
ADP	Axial Double Probe
AEB	Actel Electronics Box
APMC	Agency Program Management Council
AETD	Applied Engineering & Technology Directorate
AFG	Analog Fluxgate
AFOSHSTD	Air Force Occupational Safety and Health Standard
AFSPCMAN	Air Force Space Command Manual
AGS	Attitude Ground System
AH	Amp Hour
AMS	Acceleration Measurement System
AnIE	Analog Interface Electronics
ANSI	American National Standards Institute
AO	Announcement of Opportunity
AOS	Acquisition of Signal
API	Application Programmer Interface
APID	Application Identifier (CCSDS)
APL	Applied Physics Laboratory
ARR	Assembly Readiness Review
ASA	Austrian Space Agency
ASIC	Application-Specific Integrated Circuit
ASIST	Advanced Spacecraft Integration and System Test
ASL	American Sign Language
ASME	American Society of Mechanical Engineers
ASPOC	Active Spacecraft Potential Control
ASTM	Automatic Safe to Mate
AT	Aliveness Test
ATP	Acceptance Test Plan
ATP	Authorization to Proceed
ATR	Acceptance Test Review
ATS	Absolute Time Sequences	Top
BAAD	Burst Algorithm Description Document
BADCO	Burst Algorithm Definition and Concept of Operations
BB	Breadboard
BDQ	Burst Data Quality
BEB	Boom Electronics Box
BECO	Booster Engine Cutoff
BFM	Bus Functional Model
BOB	Break-Out Box
BOL	Beginning of Life
BP	Backplane
BPSK	Binary Phase Shift Keying	Top
C&DH, C/DH	Command & Data Handling
CBE	Current Best Estimates
CBOD	Clamp Band Opening Device
CCAM	Collision and Contamination Avoidance Maneuver
CCB	Configuration Control Board
CCSDS	Consultative Committee for Space Data Systems
CDHS	Command & Data Handling Subsystem
CDIP	Central Data Interface Processor
CDQ	Cycle Data Quality
CDR	Critical Design Review
CDRL	Contract Data Requirements List
CE	Conductive Emissions
CE	Complex Electronics
CEB	Central Electronics Box
CETP	Centre d’étude des Environnements Terrestre et Planétaires
CF	CFDP File Transfer
CFE	Core Flight Executive
CFD	Constant Fraction Discriminator
CFDP	CCSDS File Delivery Protocol
CFE	Core Flight Software Executive
CFS	Core Flight Services
CFS	Core Flight Software System
CG	Center of Gravity
CGA	Column Grid Array
CGSE	C&DH Ground Support Equipment
CI	Command Ingest
CHiFi	Constellation HiFi simulation
CID	Current Interrupt Device
CIDP	Central Instrument Data Processor
CIL	Critical Item List
CIRAS	C&DH , IRAS, Software
CM	Center of Mass
CM	Configuration Management
CMC	Center Management Council
CME	Coronal Mass Ejection
CMMI	Capability Maturity Model® Integration
CMND, CMD	Command
CNES	French Centre National d’Etudes Spatiales
Co-I	Co-Investigator
COMM	Communication
COP-1	Command Operations Protocol – 1
COTR	Contracting Officers Technical Representative
COTS	Commercial Off the Shelf
CPCI	Compact Peripheral Component Interconnect
CPT	Comprehensive Performance Test
CPU	Central Processing Unit
CQFP	Ceramic Quad Flatpack
CRAM	Cache Random Access Memory
CS	Checksum
CSA	Component SubAssembly
CSC	Computer Software Component
CSCI	Computer Software Configuration Item
CSO	Chief Safety and Mission Assurance Officer
CSS	Coarse Sun Sensor
CSTOL	Customer System Test and Operations Language
CSU	Computer Software Unit
CTE	Coefficient of Thermal Expansion
CTT	Central TTY Assembly
CU	Colorado University
CVCM	Collected Volatile Condensable Material
CXO	Crystal Oscillator
CY	Calendar Year	Top
DB	Digital Board
dB	decibel
dBi	decibel (isotropic)
dBm	decibel (mW)
DC	Direct Current
DCC	Direct Current Converter
DCMA	Defense Contract Management Agency
DCR	Design Conformance Review
DDD	Detailed Design Document
DDS	Direct Digital Synthesis
DES	Dual Electron Spectrometer
DFG	Digital Fluxgate
DFMR	Design For Minimum Risk
DIB	Diode Inhibit Board
DIL	Deliverable Items List
DIS	Dual Ion Spectrometer
DLR	German Aerospace Center
DMA	Direct Memory Access
DOD	Depth of Discharge
DOF	Degree of Freedom
DOORS	Dynamic Object-Oriented Requirements System
DPA	Destructive Physical Analysis
DPC	Direct Power Contactor
DPM/RPSM	Digital Processor Module/Receiver Power Supply Module
DPU	Digital Processing Unit
DS	Data System
DS	HK Data Storage
DS-1	Deep Space 1
DSC	Diode Switch Card
DSN	Deep Space Network
DSP	Digital Signal Processor
DSS	Digital Sun Sensor
DV	Delta-V	Top
E/PO	Education and Public Outreach
ECR	Engineering Change Request
ECSS	European Cooperation for Space Standardization
EDAC	Error Detection and Correction
EDD	Early Definition Document
EDI	Electron Drift Instrument
EDP	Energetic Particle Detector
EDU	Engineering Development Unit
EE	Electrical Engineer
EEE	Electrical and Electronics Engineering
EELV	Evolved Expendable Launch Vehicle
EEPROM	Electrically Erasable Programmable Read-Only
EGSE	Electrical Ground Support Equipment
EICD	Electrical ICD
EIRP	Effective Isotropic Radiated Power
EIS	Energetic Ion Spectrometer
ELV	Expendable launch Vehicle
EM	Engineering Model
EMC	Electromagnetic Compatibility
EMI	Electromagnetic Interference
EOL	End of Life
EPD	Energetic Particles Detector
EPF	Extended Payload Fairing
EPICS	EVD, PSE, IRAS, C&DH, Software (previous integrated avionics box)
EPO	Education & Public Outreach
EPS	Electrical Power Subsystem
EQM	Engineering Qualification Model
ERB	Engineering Review Board
ERD	Environmental Requirements Document
ES	Electrical System
ES	Executive Service
ESA	European Space Agency
ESC	Electrostatic Cleanliness
ESCB	Electrical Systems Control Board
ESD	Electrostatic Discharge
ESD/ET	Electrostatic Discharge/Engineering Test
ESS	Electrical Systems Specification
ESTEC	European Space Research and Technology Centre
ETE, E-t-E	End to End
ETR	EVD Test Rack
ETU	Engineering Test Unit
EUV	Extreme Ultraviolet
EVD	Engine Valve Drive
EVM	Earned Value Management
EVS	Event Services	Top
FAST	Fast Auroral SnapshoT
FCA	Functional Configuration Audit
FD	Flight Dynamics
FDA	Formation Design Algorithm
FDC, F/DC	Failure Detection and Correction
FDF	Flight Dynamics Facility
FDGSS	Flight Dynamics Ground Support System
FDOA	Flight Dynamics Operations Area
FEC	Forward Error Correction
FEDS	Front-End Data System
FEEPS	Fly’s Eye Energetic Particle Sensors
FET	Field Effect Transformer
FFTB	Formation Flying Testbed
FG	Flux Gate
FIELDS	not an acronym, name of MMS electric and magnetic field investigation
FIFO	First-In First-Out
FIT	FIELDS Interface Timing
FLT	Flight
FM	Flight Model
FM	File Manager
FMEA	Failure Modes and Effects Analysis
FOM	Figure of Merit
FOP	Flight Operations Plan
FOT	Flight Operations Team
FOV	Field of View
FPGA	Field Programmable Gate Array
FPI	Fast Plasma Investigation
FRB	Failure Review Board
FRR	Flight Readiness Review
FS	Fast Survey
FS I&T	Flight System I&T
FSW	Flight Software
FTA	Fault Tree Analysis
FTE	Full-Time Equivalent
FWHM	Full Width at Half Maximum
FY	Fiscal Year	Top
GaAs	Gallium Arsenide
GBM	Gamma-ray Burst Module
GDE	Gun Detector Electronics
GBK, GeBK	Germanium Black Kapton
GDS	Goddard Dynamic Simulator
GDU	Gun Detector Unit
GEMSEC	Goddard Mission Services Evolution Center
GEONS	GPS Enhanced Onboard Navigation System
GEVS	GSFC Environmental Verification Specification
GIDEP	Government Industry Data Exchange Program
GMPS	Ground Maneuver Planning Software
GN	Gaseous Nitrogen
GN	Ground Network
GN&C, GNC	Guidance, Navigation and Control
GOLD	Goddard Open Learning Design
GOTS	Government Off The Shelf
GPMC	Governing Program Management Council
GPR	Goddard Procedural Requirements
GPRS	Goddard Problem Reporting System
GPS	Global Positioning System
GS	Ground System
GSCDR	Ground System Critical Design Review
GSE	Geocentric Solar Ecliptic
GSE	Ground Support Equipment
GSEOS	Ground Support Equipment Operating System
GSFC	Goddard Space Flight Center
GSPDR	Ground System Preliminary Design Review	Top
H&S	Health and Safety
HDBK	Handbook
HEO	Highly Elliptical Orbit
HiFi	High Fidelity
HK	Housekeeping
HPCA	Hot Plasma Composition Analyzer
HQ	Headquarters
HQA	Hardware Quality Assurance
HS	Health and Safety
HV	High Voltage
HVC	High Voltage Converter
HVPS	High Voltage Power Supply
HW, H/W	Hardware
Hz	Hertz	Top
I&T	Integration & Test
I/F	Interface
IBEX	Interstellar Boundary Explorer
IBR	Integrated Baseline Review
ICA	Independent Cost Analysis
ICD	Interface Control Document
ICE	Independent Cost Estimate
IDPU	Instrument Data Processing Unit
IDQ	Instantaneous Data Quality
IDS	Inter-Disciplinary Science (Team)
IGSE	Instrument Ground Support Equipment
IM	Interface Manager
IMAGE	Imager for Magnetopause-to-Aurora Global Exploration
IMAR	Instrument Mission Assurance Requirements
IONET	IP Operational Network
IPAO	Independent Program Assessment Office
IPEP	IV&V Program Execution Plan
IRAS	Intersatellite Ranging and Alarm System
IRD	Interface Requirements Document
IRFU	Swedish Institute of Space Physics - Uppsala
IS	Instrument Suite
ISAS	Institute of Space and Astronautical Science of Japan
ISE	Instrument Systems Engineer
ISE	Investigation Systems Engineer
ISEE	International Sun-Earth Explorer
ISF	Isp Scale Factor
ISO	International Organization of Standardization
Isp	Specific Impulse
ISRD	Instrument Suite Requirements Document
ISST	Instrument Science Suite Team
IST	Integrated Systems Test
ISVP	Instrument Suite Verification Plan
IT	Information Technology
ITAR	International Traffic in Arms Regulations
ITFs	Instrument Team Facilities
ITO	Indium Tin Oxide
ITU	Integrated Test Unit
IV&V	Independent Verification & Validation
IVM	Interface Verification Model
IWF	Space Research Institute of the Austrian Academy of Sciences	Top
JAXA	Japanese Aerospace Exploration Agency
JEDI	Joint Efficient Dark-energy Investigation
JHU/APL	Johns Hopkins University/Applied Physics Laboratory
JPEG	Joint Photographic Experts Group	Top
Kbps, kbps	Kilobits Per Second
KDP	Key Decision Point
KNPR	Kennedy NASA Procedural Requirements
KSC	Kennedy Space Center
KTH	Kilo-Symbols Per Second
ksps	Royal Institute of Technology (Kungliga Tekniska högskolan) in Sweden	Top
L&EO	Launch & Early Orbit
LAN	Local Area Network
LAPSS	Large Area Pulsed Solar Simulator
LASP	Laboratory for Atmosphere and Space Physics
LRD	Launch Readiness Date
LC	Limit Checker
LDPC	Low Density Parity Check
LET	Linear Energy Transfer
LHCP	Left Hand Circular Polarization
LNA	Low Noise Amplifier
LO-3	Level Zero Three processing
LOC	Lines of Code
LOD	Letters of Delegation
LOS	Loss of Signal
LPF	Large Payload Fairing
LPP	Laboratoire de Physique des Plasmas
LPT	Limited Performance Test
LRO	Lunar Reconnaissance Orbiter
LSA	Lightning Suppression Assembly
LSP	Launch Service Provider
LSTO	Launch Services Task Order
LT	Local Time
LV, L/V	Launch Vehicle
LVDS	Low-voltage Differential Signaling
LVPC	Low Voltage Power Converter
LVPS	Low Voltage Power Supply
LZP	Level Zero Processing
LVTTL	Low Voltage Transitor-Transitor Logic	Top
M&P	Molecular & Particulate
MAG	Mission Assurance Guidelines
MAP	Microwave Anisotropy Probe
MAR	Mission Assurance Requirements
MAWP	Maximum Allowable Working Pressure
MBA	Magnetic Boom Assemblies
Mbps	Megabits Per Second
MCP	Micro Channel Plate
MD	Memory Dwell
MDQ	Mission Data Quality
MDR	Mission Definition Review
ME	Mechanical Engineer
MEB	Materials Engineering Branch
MECO	Main Engine Cutoff
MES	Main Engine Start
MEKF	Multiplicative Extended Kalman Filter
MEOP	Maximum Expected Operating Pressure
MGSE	Mechanical Ground Support Equipment
MHD	Magnetohydrodynamic
MHE	Material Handling Equipment
MICD	Mechanical Interface Control Document
microASC	micro Advanced Stellar Compass
MIP	Mandatory Inspection Point
MIPS	Millions Instructions Per Second
MIS	Management Information System
MIWG	Mission Integration Working Group
MLD	Master Logic Diagram
MLI	Multi-Layer Insulation
MM	Memory Manager
MMM	Mass Memory Module
MMS	Magnetospheric Multiscale
MMS	Maneuver Management System
MOA	Memorandum of Agreement
MOC	Mission Operations Center
MOMS	Mission Operations and Missions Services
MOR	Mission Operations Readiness
MOU	Memorandum of Understanding
MPCB	Materials and Processes Control Board
MPCP	Mishap Preparedness and Contingency Plan
MPE	Materials and Process Engineer
MPS	Manufacturing Planning Sheets
MPS	Mission Planning System
MRB	Material Review Board
MRD	Mission Requirements Document
MRT	Mission Readiness Test
ms	Millisecond
MS	Memory Scrub
MSE	Mission System Engineering
MSFC	Marshall Space Flight Center
Msps	Mega-Symbols Per Second
MSPSP	Missile System Pre-Launch Safety Package
MUA	Materials Usage Agreement	Top
N/A	Not Applicable
N	Newton
NAR	Non-Advocate Review
NASA	National Aeronautics and Space Administration
NAV, Nav	Navigator
NAV-RF	Navigator Radio Frequency
NAV-SP	Navigator Signal Processor
NCAS	NASA Contract Assurance Services
NCO	Numerically Controlled Oscillator
NCR/CAS	Nonconformance Report/Corrective Action System
NDE	Nondestructive Evaluation
NEN	Near Earth Network
NFPA	National Fire Protection Agency
NMI	Non-Maskable Interrupt
NOA	New Obligation Authority
NOSP	Network Operations Support Plan
NPD	NASA Policy Directive
NPG	NASA Procedural Guidelines
NPO	Non-Profit Organization
NPR	NASA Procedural Requirements
NPSL	NASA Parts Selection List
NRD	Network Requirements Document
NRE	Non-Recurring Engineering
NRZ-L	Non-Return-to-Zero Level
NRZ-M	Non-Return-to-Zero Mark
NSPAR	Part Approval Requests
NSSDC	National Space Science Data Center
NSTA	National Science Teachers Association
nT	NanoTesla
NTGSE	(Windows NT) Ground Support Equipment
NTIA	National Telecommunications and Information Administration	Top
O&SHA	Operating and Support Hazard Analysis
O/S	Operating System
OA	Orbit Average
OASIS	Operations And Science Instrument Support
OASIS-CC	Operations and Science Instrument Support - Command and Control
OASIS-IS	Operations and Science Instrument Support - Interface Software
OASIS-PS	Operations and Science Instrument Support - Planning and Scheduling
OBS	Observatory
OD	Orbit Determination
ODA	Orbital Debris Assessment
ODS	Orbital Debris Shield
OH	Overhead
OHA	Operations Hazard Analysis
OITL	Orbit in the Life
OM	Output Module
OMS	Office of Mission Success
OSC	Orbital Sciences Corporation
OSR	Optical Solar Reflector
OTS	Off the Shelf
OTS	Orbital Tracking System
OVP	Over Voltage Protection	Top
P&S	lanning & Scheduling
P3e	Primavera Project Planned Enterprise
PA	Power Amplifier
PA	Product Assurance
PAB	Power Analog Board
PAIP	Product Assurance Implementation Plan
PA/PSM	Power Amplifier/Power Supply Module
PA/TPSM	Power Amplifier/Transmitter Power Supply Module
PB	Playback
PCA	Physical Configuration Audit
PCB	Parts Control Board
PCB	Printed Circuit Board
PCC	Power Converter Card
PCP	Parts Control Program
PDL	Product Design Lead
PDM	Pre-Development Model
PDM	Purge Distribution Module
PDMP	Project Data Management Plan
PDR	Preliminary Design Review
PEPSSI	Pluto Energetic Particle Spectrometer Investigation
PER	Pre-Environmental Review
PERFS	Path Emulator for RF Systems
PFD	Power flux density
PFM	Proto-Flight Model
PFN	Pulse-Forming Network
PFOV	Primary Field of View
PGSE	PSE Ground Support Equipment
PHA	Preliminary Hazard Analysis
PI	Principal Investigator
PIMS	Project Information Management System
PIP	Premium IP
PLA	Payload Launch Adapter
PM	Phase Modulation
PM	Project Manager
PMC	Program Management Council
PMC	PSE Monitor Card
PMD	Propellant Management Device
PN	Pseudo-random Noise
PNAR	Preliminary Non Advocate Review
POC	Payload Operations Center
POC	Point-of-Contact
POP	Program Operating Plan
POR	Power-on Reset
POST	Power On Self Test
PPC	PowerPC
PPE	Project Parts Engineer
PPP	Primary Purge Panel
PPS	Pulse Per Second
PR/PFR	Problem Report/Problem Failure Report
PRA	Probabilistic Risk Assessment
PRE	Project Radiation Engineer
PROM	Programmable Read-Only
PRT	Platinum Resistance Thermister
PS	Project Scientist
PSDA	Parts Stress Derating Analysis
PSE	Power Supply Electronics
PSEES	Power System and Engine Valve Drive Electronic Systems
PSLA	Project Service Level Agreement
PSM	Project Safety Manager
PSR	Pre-Ship Review
PSWG	Payload Safety Working Group
pT	PicoTelsa
PT	Prototype
PTC	Positive Temperature coefficient
PTFE	polytetrafluoroethylene
PWA	Printed Wiring Assembly
PWB	Printed Wiring Board
PWM	Pulse Width Modulation	Top
QA	Quality Assurance
QM	Qualification Model
QPSK	Quadrature Phase Shift Keying	Top
RA	Resource Analyst
RAM	Radom Access Memory
RBD	Reliability Block Diagram
RCS	Reaction Control System
Re	Earth Radius
RF	Radio Frequency
RFA	Request for Action
RFC	RF Compatibility
RFCS	RF Communication Subsystem
RFGSE	RF Ground Support Equipment
RFI	Radio Frequency Interference
RFI	Request for Information
RFM	Radio Frequency Module
RLAT	Radiation Lot Acceptance Testing
RLSP	Request for Launch Service Proposal
RMS	Risk Management System
ROI	Region of Interest
RPM	Revolutions Per Minute
RPP	Reliability Program Plan
RRD	Risk Reduction Deck
RS	Reed-Solomon
RSS	Root Sum Square
RT, R/T	Real Time
RTL	Register Transfer Level
RTS	Relative Time Sequences
RUI	Requirements Unique Identifier	Top
S&MA	Safety and Mission Assurance
SA	Solar Array
SACNAS	Society for the Advancement of Chicanos and Native Americans in Science
SAFS	Standard Autonomous File Server
SAM	Solar Array Module
SAM	Systems Assurance Manager
SAR	Safety Assessment Report
SB	Software Bus
SC, S/C	Spacecraft
SCD	Source Control Drawing
SCH	Scheduler
SCM	Search Coil Magnetometer
SCP	Stored Command Processor
SCT	Spacecraft Time
SDC	Science Data Center
SDC	Student Dust Counter
SDF	Standard Delay Format
SDO	Solar Dynamics Observatory
SDP	Software Development Plan
SDP	Spin-Plane Double Probe
SDR	System Definition Review
SDRAM	Synchronous Dynamic Random Access Memory
SE	Shielding Effectiveness
SE	System Engineer
SECEF	Sun-Earth Connection Education Forum
SEE	Single Event Effects
SEL	Single Event Latch-ups
SET	Single Event Transient
SET	Systems Engineering Team
SEU	Single Event Upset
SFCG	Space Frequency Coordination Group
SFOT	Space Flight Operations Team
SFP	Single Failure Point
SHCS	Socket Head Cap Screw
SIMS	Simulations
SIP	Subsystem Implementation Plan
SITL	Scientist in the Loop
SLOC	Source Lines of Code
SMA	Safety & Mission Assurance
SMA	S-band Multiple Access
SMA	Semi-Major Axis
SMD	Science Mission Directorate
SMP	Software Management Plan
SN	Space Network
SNSB	Swedish National Space Board
SN-SMA	Space Network-S-band Multiple Access
SNUG	Space Network Users Guide
SOC	Science Operations Center
SOW	Statement of Work
SP	Signal Processor
SPEI	Space Power Electronics, Inc.
SPF	Single Point Failures
SPG	Single Point Ground
SpW	SpaceWire
SQA	Software Quality Assurance
SQE	Software Quality Engineer
SQPSK	Staggered Quadrature Phase-shift Keying
SRAM	Static Random Access Memory
SRB	Solid Rocket Booster
SRB	Standing Review Board
SRO	System Review Office
SRR	System Requirements Review
SS	Spread Spectrum
SSA	S-band Single Access
SSD	Solid State Detector
SSI	Synchronous Serial Interface
SSPA	Solid State Power Amplifier
ST-5	Space Technology 5
STDT	Science and Technology Definition Team
STEREO	Solar TErrestrial RElations Observatory
STP	Solar Terrestrial Probes
STK	Satellite Tool Kit
STP	Solar Terrestrial Probe
SUROM	Start-Up Read Only Memory
SV	Space Vehicle
SW, S/W	Software
SW	Spacewire
SWCDR	Software Critical Design Review
SWICD	Software ICD
SWPDR	Software Preliminary Design Review
SwRI	Southwest Research Institute
SWRR	Software Requirements Review	Top
T&M	Theory & Modeling
T&TC	Telemetry, Tracking & Command
TAA	Technical Assistance Agreement
TAI	International Atomic Time
TAMU	Texas A&M University
TAYF	Test As You Fly
TB	Thermal Balance
TBC	To Be Confirmed
TBD	To Be Determined
TBL	Two-Burn Lambert
TBR	To Be Resolved
TC	Test Conductor
TCAD	Telemetry Checking and Display
TCS	Thermal Control Subsystem
TD	Trigger Data
TDC	Time Digital Converter
TDMA	Time Division Multiple Access
TDN	Trigger Data Numbers
TDP	Telemetry Data Processing
TDRS	Tracking and Data Relay Satellite
TDRSS	Tracking and Data Relay Satellite System
TED	Triple Error Detect
THEMIS	Time History of Events and Macroscale Interactions During Substorms
Ti	Titanium
TID	Total Ionizing Dose
TIMED	Thermosphere Ionosphere Mesosphere Energetics and Dynamics
TLM	Telemetry
TML	Total Mass Loss
TMM	Thermal Mass Models
TO	Telemetry Output
TOF	Time of Flight
TOMS	Task Order Management System
ToR	Terms of Reference
TP/HPDB	Test Panel Heater Power Distribution Box
TQSM	Telemetry Quality and Status Monitoring
TRAD	Technical Resource Allocation Document
TRK	Tracking
TRL	Technology Readiness Level
TRR	Test Readiness Review
TS	Table Services
TSF	Thrust Scale Factor
TSIM	TDRS Simulator
TTL	Transistor-Transistor Logic
TSTATS	Thermostats
TUBS	Technical University of Braunschweig
TV, TVAC	Thermal Vacuum
TVS	Total Verification System
TWTA	Traveling Wave Tube Amplifier	Top
UART	Universal Asynchronous Receiver/Transmitter
UC	University Colorado
UCB	University of California, Berkeley
UCLA	University of California, Los Angeles
UI	University of Iowa
ULA	United Launch Alliance
UNH	University of New Hampshire
ULA	United Launch Alliance
UPS	Uninterruptable Power Source
USN	Universal Space Network
USO	Ultra-Stable Oscillator
UTC	Coordinated Universal Time
UV	Ultra-Violet
UVIS	Ultraviolet Imaging Spectrograph	Top
V&V	Verification and Validation
VCDU	Virtual Channel Data Unit
VHDL	Very-High-Speed Integrated Circuit (VHSIC) Hardware Description Language)
VIF	Vehicle Integration Facility
VMO	Virtual Magnetospheric Observatory
VTL	Verification Tracking Log	Top
WBS	Work Breakdown Structure
WCA	Worst Case Analysis
WOA	Work Order Authorization	Top
XCVR	Transceiver
XMITTER	Transmitter
XEPF	Extended EPF
XTCE	Extensible Markup Language (XML) Telemetric & Command	Top