CASSINI-HUYGENS ACRONYMS


January 19, 2004


AACS: Attitude and Articulation Control Subsystem 
ACP: Aerosol Collector and Pyrolyzer (Huygens experiment)
AD: Applicable Document
ADC: Analogue Digital Converter
ADD: Architecture Design Document
AFC: AACS Flight Computer
AGC: Automatic Gain Control
ALF: Assisted Load Format
AoA: Angle of Attack
ADRS: Attitude Determination and Reconstruction Subgroup (of DTWG)
AMMOS Advanced Multi-Mission Operations System 
APID: Application Process ID
ASI: Agenzia Spaziale Italiana
AT: Acceptance Test
 
BCM: Back Cover Mechanism
BCSS: Back Cover SubSystem
BDR: Battery Discharge Regulator
BIU: Bus Interface Unit
BPSK: Bi Phase Shift Keying
CAM: Command Approval Meeting
CAN: Camberra DSN Station
CAPS: Cassini Plasma Spectrometer (Cassini experiment)
CASU: Central Accelerometer Sensor Unit
CCAM: Collision & Contamination Avoidance Maneuvre 
CCT: Central Communications Terminal
CDA: Cosmic Dust Analyzer (Cassini experiment)
CDB: Cassini Central DataBase 
CDMU: Command and Data Management Unit 
CDMS: Command and Data Management Subsystem
CDR: Central Data Recording assembly (or)
CDR: Critical Design Review 
CDS: Command and Data Subsystem
CET: Central European Time
C/H : Cassini-Huygens
CHAT: CUT Housekeeping Table
CIMS Cassini Information Management System 
CIRS: Composite InfraRed Spectrometer (Cassini experiment)
Ck: Clock
CMD: Command 
CMT: Constraint Monitor 
CNES: Centre National d’Etudes Spatiales
CO: Check Out
CO-I: Co-Investigator
COR: Check-Out Review
CPU: Central Processing Unit 
CRC: Cyclic Redundancy Code or
CRC: Critical Relay Controller 
CRID: Command Request Interface Document
CRP: Contigency Recovery Procedures
CSOC: Consolidated Space Operations Contract 
CUT: Computed Unit Time (125 ms)
CV : Command Verification

DAC: Digital Analogue Converter
DAWG: Data Archive Working Group
DB: DataBase
DBI: Data Bus Interface
DC: Downconverter 
DCC: Downlink Channel Controller 
DCSS: Descent Control Subsystem
DDB: Descent Data Broadcast
DDD: DSN Data Delivery (or)
DDD: Detailed Design Document
DDID: Data Delivery Interface Document 
DDS: Data Distribution System (or Data Dissemination System) 
DISR: Descent Imager and Spectral Radiometer (Huygens experiment)
DL: Downlink 
DLR: Deutsches zentrum fuer Luft and Raumfahrt
DMA: Direct Memory Access 
DMD: Data Monitor and Display 
DOF: Degree Of Freedom
DOM: Distributed Object Manager 
DMA: Direct Memory Access
DMS: Data Management System (?)
DSCC: Deep Space Communications Center 
DSMS: Deep Space Mission System 
DSN: Deep Space Network
DSOT: Data System Operations Team 
DTAT: Descent and Trajectory Analysis Tool
DTSTART: Dead Time Start
DTTL: Data Transition Tracking Loop 
DTWG: Descent Trajectory Working Group
DWE: Doppler Wind Experiment (Huygens experiment)

EADS: European Aeronautic Defense and Space company
EAICD: Experiment to Archive Interface Control Document
ECC: Emergency Control Center 
ECR: Engineering Change Request
EDAC: Error Detection and Correction
EEPROM: Electrically Erasable Programmed Read Only Memory
EGSE: Electrical Ground Support Equipment
EICD: Electric Interface Control Document
EID: Experiment Interface Document 
EM: Engineering Model 
EME: Earth Mean Equator
ENA: ENtry Assembly 
EOID: Experiment Operations Interface Document 
EPSS: Electrical Power Subsystem
EPT: Experiment Polling Table
ERT: Earth Receive Time 
EQM: Engineering and Qualification Model 
ESA: European Space Agency 
ESOC: European Space Operations Centre 
ESTEC: European Space Technology Centre 
ESW: Experiment Status Word
 
FAR: Flight Acceptance Review 
FCO : Flight Check Out 
FCP: Flight Control Procedure 
FDI: Frame Data Interrupt
FER: Frame Error Rate
FM: Flight Model 
FMECA: Failure Mode, Effects and Criticality Analysis
FOP: Flight Operations Plan 
FP: Fault Protection 
FPA: Flight Path Angle (Entry Angle) 
FR: Flight Rule 
FRSS: Front Shield Subsystem
FSM: Front Shield Mechanism
FSW: Flight SoftWare 
FTDD: Fault Tolerant Data Delivery 
FTP: File Transfer Protocol 


GCF: Ground Communications Facility 
GCMS: Gas Chromatograph & Mass Spectrometer (Huygens experiment)
GCR: Ground Communications Router 
GCS: Ground Communications System 
GIF: GCF Interface 
GLD: Goldstone DSN Station 
GSE: Ground Support Equipment
GSFC: Goddard Space Flight Center 
GSIU: Ground Segment Interface Unit
GUI: Graphical User Interface 


HASI: Huygens Atmosphere Structure Instrument (Huygens experiment)
HCD: Hardware Command Decoder 
HDR: Hardware Design Review 
HIT: Huygens Implementation Team
HGA: High Gain Antenna 
HK: HouseKeeping
HMCS: Huygens Monitoring and Control System
HMT: Huygens Mission Team
HP: Huygens Probe
HPOC: Huygens Probe Operations Center
HRTF: Huygens Recovery Task Force 
HSWT: Huygens Science Working Team
HW: HardWare 
HWM: High Water Mark 


ICA: Intermediate Frequency Channel Assembly 
ICD: Interface control Document 
ICIS: Institutional Computing & Information Systems 
ICMP: Internet Control Message Protocol 
IDLR: Integrated Data Link Report 
IDR: Intermediate Data Record 
IDS: Inter-Disciplinary Scientist 
IF: Intermediate Frequency 
I/F: Interface
IFC: Intermediate Frequency Switch Controller 
IFS: Intermediate Frequency Switch
INMS: Ion and Neutral Mass Spectrometer (Cassini experiment)
I/O: Input/Output
IO Net: IP Operations Network (NISN) 
IRQ: Interrupt ReQuest
IRU: Inertial Reference Unit
IRD: Interface Requirement Document
ISP: Internet Service Provider 
ISR: Interrupt Service Routine
ISS: Imaging Science Subsystem (Cassini experiment)
ITAR: International Traffic in Arm Regulations 
ITL: Integrated Test Laboratory, or
ITL: Input TimeLine 
IVP: Inertial Vector Propagator 
IVT: Interrupt Vector Table

JIVE: Joint Institute for VLBI in Europe
JPL: Jet Propulsion Laboratory 

kbps: kilobits per second 
KO: Kick Off
KOM: Kick Off Meeting

LAN: Local Area Network 
LGA: Low Gain Antenna 
LLDD: Low Latency Data Delivery 
LNA: Low Noise Amplifiers 
LofA: List of Acronyms 
LSB: Less Significant Bit (Byte)
LSW: Less Significant Word

MAD: Madrid DSN Station 
MAG: Magnetometer (Cassini experiment)
MAS: Manoeuvre Automation Software  
MCD: Maximum Likelihood Convolutional Decoder 
MCR: Main Control Room 
MCS: Multimission Control System
MDB: Mission DataBase
MEA Cassini Main Engine Assembly (or)
MEA: Main Error Amplifier
MET: Mission Elapsed Time
MIB: Mission Information Base 
MIMI: Magnetosphere Imaging Instrument (Cassini experiment)
MIP: Mission Implementation Plan
M/L: Memory Load
MLPPP: Multilink Point-to-Point Protocol
MM: Mission Manager (Jean-Pierre Lebreton)
MMU: Memory Management Unit
MOC: Mission Operations Center 
MOM: Mission Operations Manager (Claudio Sollazo)
MOP: Mission Operations Plan
MPM: Management Progress Meeting (ESA and Prime)
MSB: Most Significant Bit (Byte)
MSW: Most Significant Word
MSO: Mission and Science Operations
MSSO: Cassini Mission Support and Services Office
MTL: Mission TimeLine 
MTT: Mission Timeline Table
MTU: Mission Timer Unit
MUX: MUltipleXer
MVDA: Mission Visual Data Analysis

NAC: Narrow Angle Camera
NASA: National Aeronautics and Space Administration
NAV: Cassini NAVigation team
NCO: Numerically Controlled Oscillator
NERT: NEar Real Time
NEU: Network Encryption Unit
NISN: NASA Integrated Services Network
NMC: Network Monitor and Control 
NOCC: Network Operations Control Center
 
OBDH: On Board Data Handling
OBSM: On Board Software Maintenance
OBSW: On Board Software
OD: Orbit Determination solution
ODM: Orbiter Deflection Maneuver
ODT: Orbiter Delay Time
OIA: Operational Interface Agreement
OpNav: Optical Navigation
OTM: Orbital Trim Maneuvre
OWLT: One Way Light Time

PAA: Probe Aspect Angle
PASDA: PArachute System Design and Analysis tool
PB: Playback
PCB: Printed Circuit Board
PCHK: Probe CHecKout telemetry mode
PcK: Planetary Constants Kernel
PCO: Probe Check Out
PCU: Power Conversion Unit 
PDD: Parachute Deployment Device
PDRS: Probe Data Relay Subsystem
PDRSVF: Probe Data Relay Subsystem Verification Facility
PDS: Planetary Data System 
PHSS: Probe Harness SubSystem
PI: Principal Investigator
PISA: Principal Investigator Support Area 
PLT: Parameter Location Table
PJM:  Parachute Jettison Mechanism
Pkt: Packet
PM: Project Manager
PMIS: Project Management Information System
POSW: Probe On-Board Software
PRA: Probe Relay Antenna
PRL: Probe Relay Link
PRM: Periapsis Raise Maneuver
PROM: Programmable Read Only Memory
PRT: Probe Relay Test
PS: Project Scientist (Jean-Pierre Lebreton)
PSA: Probe Support Avionics (or)
PSA: Planetary Science data Archive (of ESA)
PSE: Probe Support Equipment
PSG: Project Science Group
PSR: Project Support Room
PST: Polling Sequence Table (or)
PST: Project Scientist Team (or)
PST: Pacific Standard Time
PTA: Probe Transmitting Antenna
PTCT: Pre-defined TeleCommand Table
PTM: Probe Targeting Maneuver
PTT: Probe Transmitting Terminal
PUP: Project Update Package

QPM: Quarterly Progress Meeting

RAM: Random Access Memory
RASU: Radial Accelerometer Sensor Unit
RAU: Radar Altimeter Unit
RCS: Reaction Control System
RD: Reference Document 
REU: Remote Engineering Unit
RF: Radio Frequency
RFE: Receiver Front End
RFS: Radio Frequency Subsystem
RID: Review Item Discrepancy
RNS: Reliable Network Server assembly
ROSA: Remote Operations Support Area
RPM: Round Per Minute
RPWS: Radio and Plasma Wave Science (Cassini experiment)
RRP: RF and Ranging Processor
RS: Reed Solomon
RSDL: Reed Solomon Decoder Link
RSS: Radio Science Subsystem (Cassini experiment)
RT: Real Time (or)
RT: Remote Terminal
RTC: Real Time Clock
RTI: Real Time Interrupt
RTU: Remote Terminal Unit
RUSO: Receiver Ultra Stable Oscillator
RWE: Read-Write to End
Rx: Receiver

SASF: Spacecraft Activity Sequence File
SASW: Support Avionics Software
SBT: S-Band Transmitter
S/C or SC: Spacecraft
SCET: Spacecraft Event Time
SCIOP: Spacecraft Operations LAN
SCLK: Spacecraft Clock
SCO: Cassini Spacecraft Office
SCOS: SpaceCraft Operating System
SDE: Software Development Environment
SDR: Software Design Review 
SED: Spin Eject Device
SEM: System Engineering Manager
SEPS: SEParations Subsystem
SEU: Single Event Upset
SFDU: Standard Formatted Data Units
SFG: Special Function Gateway
SFOS: Space Flight Operations Schedule
SICD: Software Interface Control Document
SID: Star Identification
SIS: Sofware Interface Specification
SLE: Space Link Extension
SMP: Software Maintenance Plan (or)
SMP: Science Management Plan
SMT: SSR Management Tool
SENR: Science and ENgineering Record telemetry mode
SNR: Signal to Noise Ratio 
SOI: Saturn Orbit Insertion (July 1st 2004)
SOPC: Science Operations and Planning Computer (Center??)
SOST: Saturn Observation Science Team
SPC: Signal Processing Center, or
SPC: Science Programme Committee (of ESA)
SPICE: Spacecraft, Planet, Instrument C-matrix Ephemeris kerne;
SPK: Spacecraft and Planet ephemeris data file Kernel
SPVT: Science Planning Virtual Team
SRU: Stellar Reference Unit
SSA: Symbol Synchronizer Assembly
SSDE: Service System Development Engineer
SSE: SubSystem Engineer
SSF: Spacecraft Sequence File
SSM: Service System Manager
SSP: Surface Science Package (Huygens experiment)
SSPS: Solid State Power Switch
SSR: Solid State Recorder
SSRIU: Solid State Recorder Interface Unit
SSMM Solid State Mass Memory 
STM: Structural Thermal Model (or)
STM: Spacecraft Telemetry Mode
STPM: Structural Thermal and Pyro Model
SUM: Software User Manual
SVT System Verification Test (or)
SVT Sequence Virtual Team (or)
SVT Spin Values Table
SVVP: Software Verification and Validation Plan
S/W: Software
 
TAT: Time Altitude Table
TBC: To Be Confirmed
TBD: To Be Defined (or) 
TBD: To Be Done
TBW: To Be Written
TC: TeleCommand 
TCB: TeleCommand Buffer
TCPIP: Transfer Control Protocol – Internet Protocol 
TCM: Trajectory Correction Maneuver 
TCXO: Temperature Compensated Crystal Oscillator
TDS: Telemetry Delivery Subsystem
TET: Test Elapsed Time
TF: Transfer Frame
THSS: THermal control SubSystem
TIS: Telemetry Input Subsystem
TLP: TeLemetry Processor
TM: Telemetry
TMI: Telemetry Interrupt
TN: Technical Note
TPM: Technical Progress Meeting (replaced a QPM in 2003)
TUSO: Transmitter Ultra Stable Oscillator

ULO: UpLink Office
UM: User Manual
USM: Umbilical Separator Mechanism
USO: Ultra Stable Oscillator
UT: Universal Time
UVIS: Ultraviolet Imaging Spectrometer (Cassini experiment)

VC: Virtual Channel
VCO: Voltage Controlled Oscillator
VCXO: Voltage Controlled Crystal Oscillator
VIMS: Visible and Infrared Mapping Spectrometer (Cassini experiment)
VLBI: Very Long Base Interferometry
VPN: Virtual Private Network

WAC: Wide Angle Camera
WAN: Wide-Area Network

XBA: Cross-Bus Assembly
XIO: external Input Output
Xmit: Transmit