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Abbreviations
GTRF
Galileo terrestrial reference frame
HA
Heading angle
HFM
High-frequency modulator
HFO
High-frequency oscillator
HNS
Hyperbolic navigation systems
HP
Horizontal plane
HRNS
Hyperbolic (differential-ranging) radio navigation systems
Htd.
Heterodyne
IA
Initial approach
IAGC
Instantaneous automatic gain control
ICAO
International Civil Aviation Association
ICSt
Integral control station
ICS
Integrated control system
IDD
Input distribution device
IERS
International Earth Rotation Service
IFA
Intermediate-frequency amplifier
IFO
Intermediate-frequency oscillator
IFPA
Intermediate-frequency pre-amplifier
IFq
Intermediate frequency
IFx
Intermediate fix
ILS
Instrument landing system
Int.
Integrator
IRf
Interfering reflections
IRNSS
Indian regional navigation satellite system
ITB
International Time Bureau
ITRF
International terrestrial coordinate system
LA
Limiting amplifier
LAL
Local airlines
LB
Locator beacon
LCCS
Local control and corrective system
LDP
Local dispatching points
LFM
Linear frequency modulation
LNA
Low-noise amplifier
LOC
Localizer
LRL
Landing (approach) radar locator
LRRNS
Long-range radio-technical navigation systems
LWC
Liquid water content
M
Modulator
Magn.
Magnetron
MDAP
Main dispatching approach points
MFD
Multi-function display
MLC
Matching loss coefficient
MLS
Microwave landing system
MMR
Multi-mode receiver
MP
Monochrome pulse