Bedienungsanleitung Pioneer CNDV-50MT (Seite 114 von 142) (Englisch)

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Appendix NAVI/AV

quality is poor, only two dimensions, latitude and

longitude, can be obtained and positioning errors

are somewhat greater.

Positioning by dead reckoning

The 3D Hybrid Sensor in the main unit also

calculates your position. The current location is

measured by detecting driving distance with the

speed pulse, the turning direction with the

Gyrosensor, and inclination of the road with the G

sensor.

The 3D Hybrid Sensor can even calculate

changes of altitude, and corrects for

discrepancies in the distance travelled caused by

driving along winding roads or up slopes. Also,

the Navigation System learns the driving

conditions and stores information in the memory;

thus, as you drive more, the precision of the

positioning becomes more accurate.

The method of positioning changes as follows

depending on whether the speed pulse of your

vehicle is detected or not:

3D hybrid mode

This is active when the speed pulse is detected.

Inclination of a road can be detected.

Simple hybrid mode

When the speed pulse is not detected,

positioning is performed in this mode. Only

horizontal movement is detected, so it becomes

less accurate. Also, when the positioning by GPS

is not available, such as when your vehicle enters

a long tunnel, the discrepancy between your

actual and calculated position may become

bigger.

❒ The speed pulse data comes from the speed

sensing circuit. The location of this speed

sensing circuit depends on your vehicle

model. In some cases, it is impossible to

make a connection to it, and in such a case

we recommend that the ND-PG1 speed pulse

generator (sold separately) be used.

How do GPS and dead

reckoning work together?

For maximum accuracy, your Navigation System

continually compares GPS data with your

estimated position as calculated from the data of

3D Hybrid Sensor. However, if only the data from

the 3D Hybrid Sensor is available for a long

period, positioning errors are gradually

compounded until the estimated position

becomes unreliable. For this reason, whenever

GPS signals are available, they are matched with

the data of the 3D Hybrid Sensor and used to

correct it for improved accuracy.

To ensure maximum accuracy, the dead

reckoning system learns with experience. By

comparing the position it estimates with your

actual position as obtained using GPS, it can

correct for various types of error, such as tyre

wear and the rolling motion of your vehicle. As

you drive, the dead reckoning system gradually

gathers more data, learns more, and the

accuracy of its estimates gradually increases. So,

after you have driven some distance, you can

expect your position as shown on the map to

show fewer errors.

❒ If you use chains on your wheels for winter

driving or put on the spare wheel, errors may

suddenly increase because of difference in

wheel diameter. The system detects the fact

that the tire diameter has changed, and

automatically replaces the value for

calculating distance.

❒ If the ND-PG1 is used or if your vehicle is

operating in Simple hybrid mode, the distance

calculation value cannot be replaced

automatically.

MAN-CNDV-50MT-EN.book Page 112 Wednesday, May 4, 2005 1:49 PM

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