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Audi NAVIGATION SYSTEM PLUS Specifications Page 11

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11
SSP 199-014SSP 199-014
TP
017
GPS
75 km
FM2
5
ffn
ENTER ruft die Kartendarstellung auf
Dead-reckoning navigation
The system components of the Radio Naviga-
tion System increase the accuracy of position
fixing.
The navigation control unit calculates the route
profile from the signal supplied by the angle of
turn sensor for determining changes in the
direction of travel to the left/right and the pul-
ses generated by the ABS wheel speed sensor
for calculating the distance travelled.
.
Dead-reckoning navigation is the result of the
interplay between these two sensors.
The navigation control unit compares the route
profile with the street map stored on the CD-
ROM several times per second.
This comparison process is known as “map
matching“.
The accuracy of position fixing can thus be
increased to ±5m in urban areas and ±50m
on long, straight country roads or motorways.
If the vehicle is located on a road which is not
stored on the CD-ROM, the message “OFF-
ROAD“ appears on the display.
“Map matching“ cannot be performed then.
Therefore, only the straight line distance and
the direction to the destination are displayed.
Sa
tellite
G
PS a
ntenna
a
nd
receiver
N
a
vig
a
tion con-
trol unit
+
Turn a
ng
le senso
r
A
B
S w
heel senso
r
C
D
-RO
M
N
a
vig
ation con-
trol unit
=
V
e
h
i
c
l
e
n
a
v
i
g
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t
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o
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g
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o
n
SSP 199/008
Vehicle navigation is the overall result of the inter-
play between satellite navigation and dead-
reckoning navigation.
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