AOCS      Attitude and Orbit Control Subsystem
AOCS      Attitude and Orbit Control Electronics
AT        Anisotropy Telescope (COSPIN)
AU        Astronomical Unit

B
BAM       Solar Wind Observation Over the Poles of the Sun
          (SWOOPS)
BAM-E     SWOOPS Electron instrument
BAM-I     SWOOPS Ion instrument
BOM       Beginning of Mission
bps       bits per second
BSNR      Bit Signal to Noise Ratio
BT        Backup Table
BWG       DSN Beam Waveguide antenna 

C
CAL       Calibration
CE        Control Electronics
CoI       Co-Investigator
CONJ      On-board Conjunction program
Conscan   Conical Scanning
COSPIN    Cosmic Ray and Solar Particle Investigation
CTU       Central Terminal Unit
CTUMON    On-board Data Handling monitor program

D
dB        decibel
DHS       Data Handling Subsystem
DNEL      Disconnect Non Essential Loads
DPU       Data Processing Unit
DR        Discrepancy Report
DSN       Deep Space Network
DSS       Deep Space Station
DSU       Data Storage Unit (on-board tape recorder)
DUST      Cosmic Dust experiment (GRU)

E
ELD       External Linear Dumper circuit
ENG       Engineering telemetry format: no science data
EPAC      Energetic Particles experiment (KEP)
EPC       Electronic Power Conditioning
EPD       External Power Dumper
ERT       Earth Receive Time
ESA       European Space Agency
ESOC      European Space Operations Centre,
          Darmstadt, Germany
ESTEC     European Space Research and Technology Centre,
          Noordwijk, The Netherlands
ETT       Earth Transmit Time

F
FCV       Flow Control Valve
FD        On-board Failure Detection logic
FES       Fast Envelope Sampler (STO)
FGM       Flux Gate Magnetometer (HED)

G
GAS       Interstellar Neutral Gas experiment (KEP)
GLG       Solar Wind Ion Composition Spectrometer experiment
          (SWICS)
GRB       Gamma Ray Burst experiment (HUS)
GRU       Cosmic Dust experiment (DUST)
GWE       Gravitational Wave Experiment

H
HED       Magnetic Field experiment (FGM/VHM)
HET       High Energy Telescope (COSPIN)
HFT       High Flux Telescope (COSPIN)
HGA       High Gain Antenna
HI-SCALE  Heliospheric Instrument for Spectra, Composition,
          and Anisotropy at Low Energies (LAN)
HUS       Solar X-rays and Cosmic Gamma Ray Bursts
          experiment (GRB)
HV        High Voltage
Hz        Hertz

I
IFC       In Flight Calibration
INA       On-board Initial Acquisition program
INT       Interleaved telemetry format
          (real-time and playback data interleaved)
IPD       Internal Power Dumper
IUS       Inertial Upper Stage

J
JPL       Jet Propulsion Laboratory, Pasadena, California 

K
KEP       Energetic Particles / Interstellar Helium
          experiments (EPAC/GAS)
KET       Kiel Electron Telescope (COSPIN)
km        Kilometre
kW        Kilowatt

L
LA        Lower Axial (thruster)
LAN       Heliospheric Instrument for Spectra, Composition,
          and Anisotropy at Low Energies (HI-SCALE)
LET       Low Energy Telescope
LGA       Low-gain antenna
LOC       On-board loss-of-command program
LV        Latching valve

M
ME        Meridian Slit of Cross Beam Sun Sensor
MHC       Monthly Health Check
MS        Single Slit Sun Sensor (slit aligned meridian only)

N
NASA      National Aeronautics and Space Administration

O
OBDH      On Board Data Handling
OB        Oblique Slit of Cross Beam Sun Sensor
OOL       Out of limit

P
PAM-S     Payload Assist Module - Shuttle
PAPS      Post-acceleration Power Supply
PBK       DSU in Playback
Pc/No     Carrier power / Noise spectral density
PE        Processing Electronics
PI        Principal Investigator
PS        Sun reference pulse mode flag
PSEUDO    On-board Pseudo program
PT        Primary Table

Q
QSET      On-board Watchdog supervision counter reset program

R
RAM       Random Access Memory
RAMQ      On-board RAM Quality test program
RAR       Radio-astronomy Receiver
RCIU      Remote Control Interface Unit
REC       On Board Reconfiguration program
REC       DSU in Record
RFDU      Radio Frequency Distribution Unit
Rj        Jovian radii
ROM       Read Only Memory
ROMQ      On-board ROM Quality test program 
RTG       Radioisotope Thermoelectric Generator
RTU       Remote Terminal Unit
RTUQ      On-board RTU Quality program 
Rx        Receiver

<






































































B>S
SAA       Solar Aspect Angle
SAM       On-board Safe Attitude Manoeuvre program
SBY       DSU in Standby
SCET      Spacecraft Event Time
SCI       Science telemetry format
          (reduced engineering data rates)
SEARCH    On-board autonomous manoeuvre program
SEP       Sun-Earth-Probe angle
SIM       Cosmic Rays and Solar Particle Investigation
          experiment (COSPIN)
SNR       Signal to Noise Ratio
SPE       Sun-Probe-Earth angle
SPIN      On-board Sun Reference Pulse generation program 
SRL       Subsystem Reset Logic
SRP       Spin Reference Pulse
SSC       Spin Segment Clock
SSNR      Symbol Signal to Noise Ratio
STD       DSN Standard antenna
STO       Unified Radio and Plasma Waves experiment (URAP)
STS       Shuttle Transfer System
SWICS     Solar Wind Ion Composition Spectrometer experiment
          (GLG)
SWOOPS    Solar Wind Observation Over the Poles of the Sun
          experiment (BAM) 

T
TCM       Trajectory Correction Manoeuvre
TM        Telemetry
TT&C      Telemetry, Tracking and Command
TWTA      Travelling Wave Tube Amplifier
Tx        Transmitter

U
UA        Upper axial (thruster)
URAP      Unified Radio and Plasma Waves experiment (STO)
UTC       Coordinated Universal Time

V
VHM       Vector Helium Magnetometer (HED)

W
W         Watt
WDQ       On-board Watchdog Quality program 

X
XBS       Cross Beam Sun Sensor

Y

Z