Acronyms
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NRAO
National Radio Astronomy Observatory (US)
NRII
Jet Propulsion Research Institute (the acronym in Russian)
NRL
Naval Research Laboratory (US)
NS
Neutron Star
NTS
Navigation Technology Satellite
NTSC
National Time Service Center, China
OAO
Orbiting Astronomical Observatory
OCX
Next-Generation Operational Control System
OP
French National Metrology and Testing Laboratory
OS
Open Service
OSIRIS-REx Origins, Spectral Interpretation, Resource Identification, SecurityRegolith Explorer
OSO
Orbiting Solar Observatory
PCA
Proportional Counter Array
PNT
Positioning, Navigation and Timing
PPS
Precise Positioning Service
PPTA
Parkes Pulsar Timing Array
PRS
Public Regulated Service
PSR
Pulsating Source of Radio
PT
Pulsar Time
PTA
Pulsar Timing Array
PTB
Federal Physical Institute of Germany
QZSS
Quasi Zenith Satellite System
RANT-600
Radio Astronomical Telescope Academy Nauk 600
RF
Radio Frequency
RMS
Root Mean Square
ROSAT
Röntgen Satellite
RP
Rotation Powered pulsar
RXTE
Rossi X-ray Timing Explorer
SA
Selective Availability
SAR
Search and Rescue
SCC
System Control Center
SDD
Silicon Drift Detector
SECOR
Sequential Collation of Range
SEXTANT
Station Experiment for X-ray Timing and Navigation Technology
SGR
Soft Gamma-Ray Repeater
SI
International System of Units
SINEX
Solution Independent Exchange
SINS
Strap-down Inertial Navigation System
SLBM
Submarine-Launched Ballistic Missiles
SLR
Satellite Laser Ranging
SM
Service Module
SMC
Small Magellanic Cloud
SoL
Safety of Life
SPS
Standard Positioning Service