adf vor 2005
TRANSCRIPT
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RMIT Aerospace Engineering
Automatic Direction Finding
(ADF)
Check the course
guide for references
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RMIT Aerospace Engineerin
Automatic Direction Finding (ADF)
Indicates direction of the selected ground
transmitter from the aircraft
Medium Frequenc !"# $ !% k'D* $ on Directional *eacon (+round
Transmitter)
ADF recei,er on the aircraft
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Components of ADF
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ADF Components
Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 !34/ 5age !6!!
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Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 !3!7/ 5age !60!
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8oop and 2ense Antenna
Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 !3!0/ 5age !6%
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2stems error in ADF
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VOR Very High Frequency Omni-
directional Radio range
Comprising of a ground
beacon and an airborne
installation
!utomatically andcontinuously pro"ides
the operator #ith the
magnetic bearing of the
aircraft from the beacon
VOR ground station
transmits on a specific
frequency bet#een
$%&%% and $$'() *H+,)% H+ channels.
Short range na"igation
system
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VOR purposes:
$Orientation and position fi/ing0
$1racing to or from a VOR ground station0
$holding 2for delaying or manoeu"ringaction30 and
$instrument approaches to land
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9:R Transmitter ;apoints
Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 03!/ 5age 067
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9:R 6 Radials
9:R ground transmitter radiates signals in
all directions
74# different tracks a
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Ho# VOR #ors5
$1he VOR ground station transmits t#o VHF
radio signals:
$1he reference phase6 #hich is omni-directional
- 7eamed emission that changes phase as it
rotates cloc#ise lie beam of a light house
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1he aerial of the VOR aircraft recei"er
pics up the signals6 #hose phase
difference 2bet#een the #a"e peas3 ismeasured6 this difference depending on
the bearing of the aeroplane from the
ground station
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8ight House analogy
$9magining a light house emits an
omnidirectional flash of light e"ery time the
beam is pointing due north 9f the speed of
rotation is no#n6 and if a distant obser"er
could record the time inter"al bet#een
seeing omni-directional flash and seeing the
beam6 bearing of the light house can becalculated
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9:R 2ignals
1he demodulated output of the recei"er
contains:
$$%% H+ !udio signal$a Variable phase ;% H+ signal
$a Reference ;% H+ signal in the form of
frequency modulation on a ((
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Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 03%/ 5age 06!#
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Source:-A,ionics./ Module 0#1 Radio a,igation 2stems/ ational Training Materiels for the Aerospace Industr/
Australian ational Training Authorit/ !""%/ Fig3 03!&/ 5age 06!>
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VOR 9ndicators
1he output of VOR recei"er:$ !udio to headsets,$%% H+.
$ 7earing information
$ =e"iation from selected radial$ 1O>FRO* signal$ Flag or #arning signal
*anual VOR requires the pilot to select a
particular radial on #hich he #ants to positionhis aircraft 1he actual radial on #hich theaircraft is flying is compared #ith the desiredradial
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Reference
The Air 5ilot?s Manual $ Radio a,igation
and Instrument Fling@ 9ol &/ Tre,or Thom
-A,ionics./ Module 0#1 Radio a,igation
2stems/ ational Training Materiels for theAerospace Industr/ Australian ational
Training Authorit/ !""%/ Fig3 !34/ 5age !6!!