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How does VDO Dayton Navigation work ?
The VDO Dayton Navigation System is a powerful tool to assist the driver in
daily traffic. Automatic route planning and guidance allows you to concentrate
on the essential things in today's growing traffic – especially in congested
areas. Complicated and time-consuming planning with conventional city and
road maps is no longer required.
You simply enter the destination before driving off, activate 'Guidance' and
the Navigation System does the rest. It offers you guidance advice in both an
audible and visual way. Few controls and a simple menu structure ensure ease
of use.
Determination of the vehicle position
80
60
100
40
120
20
140
0
160
Speedometer
Navigation
signal
computer
Data from these sensors, in conjunction with positional information received
from the Global Positioning System is transmitted to the navigation computer.
The resultant calculated position is then compared against the road network
data stored on the CD-ROM in order to display the current vehicle position.
GPS (Global Positioning System)
The Global Positioning System is based on
the reception of navigation signals from a total
of currently 27 GPS satellites orbiting the earth
at a height of 13,000 miles. To determine a
3D position (with longitude, latitude and
height), signals from at least 4 satellites must
be received.
The built-in GPS receiver can handle up to
8 satellite signals simultaneously. This allows
an accuracy of about 20 ft to 60 ft which is
further improved by the other sensors.
Gyroscope
GPS signal
Digital roadmap
The movement of the vehicle is
measured by sensors that are
integrated into the Navigation
System. The distance driven is
recorded by an electronic signal
from the speedometer and the
rotary movements of turns by the
gyroscope (a rotary measurement
system). The information from these
sensors is, however, not always exact
as the values can be affected by tire
slippage, varying tire pressure due to
changes in temperature, etc.
GENERAL
85
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