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U. Glaeser

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FIGURE 38.8<br />

input into an in-vehicle navigation system. The third function is route guidance to guide you to your<br />

destination along with the determined way by the route calculation function. Normally, this guidance is<br />

performed by both voice and display for driver’s safety. The last important function is to display vehicle<br />

position, results of route search, and guidance so that drivers can understand them easily at a glance.<br />

A real configuration of a typical in-vehicle navigation system is shown in Fig. 38.8. It normally consists<br />

of the six components shown in this picture. A color monitor for a navigation system is also used to<br />

display moving pictures from a TV set and a DVD player, as shown at the lower right of Fig. 38.9. An<br />

important issue is that VICS supposes an in-vehicle navigation system to be loaded in a vehicle. So, a<br />

TV tuner also includes a receiver for VICS, in general. As shown later, VICS uses three major media such<br />

as FM multiplex, electromagnetic beacon, and infrared light beacon.<br />

Figure 38.10 is an example of a map display that often appears on a color display monitor of Japanese<br />

in-vehicle navigation system. It shows the three major basic results in the minute map: the display of the<br />

present vehicle position, the optimum route for the destination, and vehicle guidance. A simplified map<br />

in Fig. 38.10 helps drivers to understand the direction they have to follow at the next intersection. The<br />

large red triangle at the lower left of this figure shows the present vehicle position determined by the<br />

location identification technology. A row of small yellow triangles shows the optimum route calculated<br />

by a navigation system. The right simplified map in this picture enables a driver easily understand which<br />

way he or she should take at the next intersection.<br />

Figure 38.11 is another example of map display of in-vehicle navigation system. The left map in this<br />

figure shows a real map showing the present vehicle position and the calculated optimum route to the<br />

destination. The right picture shows a 3-D, simplified map with several landmarks such as McDonald’s,<br />

road messages, and a traffic signal. Normally, it is said that a 3-D representation is easily understandable<br />

for drivers regarding which way they have to go.<br />

The situation is a bit different between Japan and other countries because of people’s preferences for<br />

navigation displays are a bit different. For example, Japanese people like a map display as shown in Fig.<br />

38.10, but people of other countries like only displays of the directions drivers have to take.<br />

A block diagram of an in-vehicle navigation system is shown in Fig. 38.12. One can easily understand<br />

that essential configuration of an in-vehicle navigation system is the same as that of a personal computer<br />

excluding both the VICS unit and the sensors to be used to determine the vehicle location. In the CD-ROM,<br />

© 2002 by CRC Press LLC<br />

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