Instrument Navigation - Kansas State University
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Transcript Instrument Navigation - Kansas State University
Instrument Navigation
Chapter 2, Section C
VOR Navigation
Ground Based Transmitter
360 Radials
Aligned with magnetic north
Directional
Line of sight
VOR Ground Facility
Ground Facilities - VOR
Operate in 108.0 - 117.95 MHz Band
Standard Service Volumes (SSV)
High Altitude(HVOR) - 200 watts, up to
130 nm, used for airways
Low Altitude(LVOR) - about 100 watts,
up to 40 nm, used for airways
Terminal(TVOR) - 50 watts, 25 nm, used
for approaches
VOR Receiver Checks
VOT
VOR Ground Checkpoint
Indicated radial; +/- 4o
VOR Airborne Checkpoint
180o TO, 360o FROM; +/- 4o
Indicated radial; +/- 6o
Centerline of airway; +/- 6o
Dual VOR Check
Within 4o
Using the VOR
CDI
To-From Indicator
Intercepting a radial
Tracking
Station passage
wind correction
cone of confusion
Reverse sensing
Rotating Course Card
Omni Bearing Selector
TO/FROM
Course Deviation Indicator
Using the VOR
Basic VOR Indicator
each dot on CDI is 2o
full scale deflection is 10o
1 deg in 60 nm is 1 nm
OBS
Horizontal Situation Indicator HSI
incorporates HI, CDI, Glideslope
makes easier to scan
not reverse sensing except for using on BC
VOR Time & Distance
Calculations
90 deg Method (no wind)
Time to station=Time(sec)/bearing
change
VOR Time Distance -
0
90
Time to station (min)
Established inbound on a radial rotate the
obs 10o to the left, turn the aircraft 10o to
the right
Note the time and maintain heading until
the cdi centers
60 x Min flown between bearing change
Degrees of bearing change
Distance To station (NM)
TAS X Min. flown between bearing change
Degrees of bearing change
Isosceles Triangle
B
5 minutes
A
5 minutes
C
ADF Navigation
Ground based transmitter
Low/medium frequency (AM)
Non-directional beacon (NDB)
Not line of sight
No receiver checks
No flags - listen to Morse code
Operational Considerations
NDB
Compass locator (LOM) - 25 watts, 15
NM
MH - less than 50 watts, 25 NM
H - 50 to 1999 watts, up to 50 NM
HH - 2,000 watts or more, 75 NM
Using the ADF (fixed card)
Magnetic heading + relative bearing =
magnetic bearing
Intercepting a bearing
Tracking
wind correction
to the station
from the station
Time and distance to a station
Station passage
Rotating Card
DME
Ground based - VOR/DME, VORTAC,
ILS/DME, LOC/DME
Interrogation and response
rate * time = distance
Uses slant distance - 1 NM away for
each 1000’ elevation
Area Navigation
VOR/DME, VORTAC based
INS
Phantom VORs
Self Contained
LORAN
Radio Magnetic Indicator RMI
HI, 1 or 2 pointers for the different
stations
Pointers show the bearing to the
station without mental calculations
Tail of the VOR pointer is the radial
you are on
Global Positioning System(GPS
Describe how it works.
A fog horn blows on the hour, … speed
of sound is 550 ft/s.
Same for GPS except using speed of light.
Accuracy within 300 meters 99.99% of time
Vertical accuracy is not great.
Accuracy can be improved by DGPS
Global Positioning System(GPS)
RAIM
continuously monitors signals received
for validity
required for IFR GPS
Global Positioning System(GPS)
Two Main types of IFR GPS
enroute approved
approach approved
database must be updated frequently
database contains info about airports,
intersections, VOR, NDB, etc
Lack of Standardization among
manufacturers
GPS Approaches
Generally has a LCD or LED CDI
“fly to the bars”
when navigating 30 miles away
1 dot is 1 nm, 5 nm full scale deflection
when closer
ramps to 1 nm full scale deflection
as you fly the approach
ramps down to 0.3 nm full scale deflection