Abbreviations
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MRB
Magnetic radio bearing
MRL
Meteorological radar locator
MS
Master station
MSAS
Space augmentation system
MSK
Minimum shift keying
MT
Message types
MTI
Moving target indicator
MU
Matching unit
Mx
Mixer
NCRS
Non-coherent radar system
NGP
Navigational guide points
NSV
Navigation space vehicles
OCS
Operational control segment
OOW
Officer of the watch
OPC
Over-periodical compensation
PA
Power amplifier
PC
Personal computer
PCM
Pulse-code modulation
PCRS
Pseudo-coherent radar system
PD
Phase detector
PDOP
Position dilution of precision
PFD
Power flow density
PI
Potential indicator
PkD
Peak detector
PLL
Phase-locked-loop frequency control
POB
Persons onboard
PPAA
Passive phased antenna array
PPI
Plan position indicator
PPS
Precise Positioning Service
PRS
Pseudo-random sequence
PS
Phase shifter
PU
Processing unit
PuA
Pulse amplifier
PVOR
Precision VHF omnidirectional range
QZSS
Quasi-zenith satellite system
R
Rectifier
RAIM
Receiver autonomous integrity monitoring
RB
Radio beacon
RBLS
Radio beacon landing system
RBS
Radar beacon sequencer
RBT
Radar beacon transponder
RCS
Radar cross section
Rcv
Receiver
RFA
Radio-frequency amplifier
RfS
Reference stations