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Acronyms
SS-ANARS
Space Sextant—Autonomous Navigation Attitude Reference
System
SSB
Solar System’s Barycenter
SST
Spitzer Space Telescope
STEP
Space Test Experiments Platform
TACAN
Tactical Air Navigation System
TAI
Temps Atomique International (International Atomic Time)
TAOS
Technology for Autonomous Operational Survivability
TASS
Telegraph Agency of the Soviet Union
TCB
Barycentric Coordinate Time
TCG
Geocentric Coordinate Time
TDB
Barycentric Dynamical Time
TDMA
Time Division Multiple Access
TDRS
Tracking and Data Relay Satellite
TDT
Terrestrial Dynamical Time
TEO
Terrestrial Ephemeris Origin
TIO
Terrestrial Intermediate Origin
TOA
Time of Arrivals
TRW
Thompson Ramo Wooldridge Inc.
TSXS
Time-resolved Soft X-ray Spectrometer
TT
Terrestrial Time
TT&C
Telemetry, Tracking and Control
TWSTFT
Two-Way Satellite Time and Frequency Transfer
UK
United Kingdom
UNESCO
United Nation Educational, Scientific and Cultural Organization
URE
User Ranging Error
US
United States
USA
Unconventional Stellar Aspect experiment or United States of
America
USNO
United States Naval Observatory
USRA
U.S. Universities Space Research Association
USSR
Union of Soviet Socialist Republics
UT
Universal Time
UTC
Coordinated Universal Time
VfR
German Society for Space Flight (Acronym in German)
VHF
Very High Frequency
VLA
Very Large Array
VLBI
Very Long Baseline Interferometer
VOR
Very High-Frequency Omni-Directional Range
WGRF
Work Group of Reference Frame
WGS
World Geodetic System
XB
X-ray Binary Stars
XMM
X-ray Multi-mirror Mission
XNAV
X-ray Source-Based Navigation for Autonomous Position Determination