航空电子基础6-VOR讲课教案
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“Manual” VOR indications are displayed on
“Course Deviation Indicator” type instruments
Manual VOR CDI Indicators
Horizontal Situation Indicator (H.S.I.)
• Often a combined NAV/COM frequency selector
• Usually mounted on the glareshield or pedestal
Light Aircraft NAV Control Head
• Smaller aircraft employ a panel mounted receiver
Synchronizing the FM and AM
• VOR receivers will detect the AM signal’s positive peak, when the directional signal is pointed at the aircraft
Synchronizing the FM and AM
The 30 HZ FM Reference will be “IN PHASE”
With the 30 HZ Variable if the aircraft is directly NORTH of the VOR transmitter
The phase difference between the 30 HZ FM Reference, and the 30 HZ AM
(9960 HZ, +/- 480 HZ)
The “Sub carrier” is applied as Amplitude Modulation (AM) to the R.F.
30 HZ Variable Signal
• The R.F. cs electronically rotated during transmission, at a speed of 1800 RPM… Or 30 Cycles Per Second (HZ)
航空电子基础6-VOR
Purpose of a VOR System
• VOR is an enroute, station-to-station Radio Navigation System
• Provides Heading and Bearing information
• Used to create “Airways” • Assists in providing “Position Fix” • Auto-tunes DME when a VOR
• Each “dot” of deviation represents 5 degrees.
VOR Indications
“Automatic” VOR indications are displayed on
Compass Instruments
Radio Magnetic Indicator (RMI)
• Frequency selection is on the front of the receiver
VOR Antennas
VOR Indications
VOR indications can be displayed on a variety of different instruments.
frequency is selected
Components of a VOR System
• Antenna • Receiver • Control Head • Indication • Interconnecting wiring and antenna
coaxial cable
Large Aircraft VOR Systems
TO/FROM INDICATION
• The TO/From indication will tell you what the aircraft would do, IF you were to turn onto the selected course heading.
VOR Theory of Operation
• A 30 HZ FM Reference Signal • A 30 HZ AM Variable Signal
The VOR receiver compares the PHASE difference between the two signals
FM Reference Signal
A 30 HZ, FM “Sub carrier” is transmitted omnidirectional at
The VOR system operates in the VHF frequency band ,
from 108.0 to 117.95 MHz. • NON LOCALIZER FREQUENCIES
VOR Ground Station
VOR uses 2 types of modulation
Synchronizing the FM and AM
• The FM Reference signal is synchronized with the rotating directional (AM) signal
• The FM Reference will always be at its positive peak when the directional (AM) signal is pointed NORTH
• The NAV receiver is typically located in the radio rack or avionics compartment
Frequency Selector
• Larger aircraft have a remote mounted frequency selector in the cockpit.
“Course Deviation Indicator” type instruments
Manual VOR CDI Indicators
Horizontal Situation Indicator (H.S.I.)
• Often a combined NAV/COM frequency selector
• Usually mounted on the glareshield or pedestal
Light Aircraft NAV Control Head
• Smaller aircraft employ a panel mounted receiver
Synchronizing the FM and AM
• VOR receivers will detect the AM signal’s positive peak, when the directional signal is pointed at the aircraft
Synchronizing the FM and AM
The 30 HZ FM Reference will be “IN PHASE”
With the 30 HZ Variable if the aircraft is directly NORTH of the VOR transmitter
The phase difference between the 30 HZ FM Reference, and the 30 HZ AM
(9960 HZ, +/- 480 HZ)
The “Sub carrier” is applied as Amplitude Modulation (AM) to the R.F.
30 HZ Variable Signal
• The R.F. cs electronically rotated during transmission, at a speed of 1800 RPM… Or 30 Cycles Per Second (HZ)
航空电子基础6-VOR
Purpose of a VOR System
• VOR is an enroute, station-to-station Radio Navigation System
• Provides Heading and Bearing information
• Used to create “Airways” • Assists in providing “Position Fix” • Auto-tunes DME when a VOR
• Each “dot” of deviation represents 5 degrees.
VOR Indications
“Automatic” VOR indications are displayed on
Compass Instruments
Radio Magnetic Indicator (RMI)
• Frequency selection is on the front of the receiver
VOR Antennas
VOR Indications
VOR indications can be displayed on a variety of different instruments.
frequency is selected
Components of a VOR System
• Antenna • Receiver • Control Head • Indication • Interconnecting wiring and antenna
coaxial cable
Large Aircraft VOR Systems
TO/FROM INDICATION
• The TO/From indication will tell you what the aircraft would do, IF you were to turn onto the selected course heading.
VOR Theory of Operation
• A 30 HZ FM Reference Signal • A 30 HZ AM Variable Signal
The VOR receiver compares the PHASE difference between the two signals
FM Reference Signal
A 30 HZ, FM “Sub carrier” is transmitted omnidirectional at
The VOR system operates in the VHF frequency band ,
from 108.0 to 117.95 MHz. • NON LOCALIZER FREQUENCIES
VOR Ground Station
VOR uses 2 types of modulation
Synchronizing the FM and AM
• The FM Reference signal is synchronized with the rotating directional (AM) signal
• The FM Reference will always be at its positive peak when the directional (AM) signal is pointed NORTH
• The NAV receiver is typically located in the radio rack or avionics compartment
Frequency Selector
• Larger aircraft have a remote mounted frequency selector in the cockpit.