Bedienungsanleitung Pioneer AVIC-HD1BT (Seite 166 von 192) (Englisch)

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Appendix NAVI/AV

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 street can be detected.

Simple hybrid mode

When the speed pulse is not detected, position-

ing is performed in this mode. Only horizontal

movement is detected, so it becomes less accu-

rate. 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 reckon-

ing work together?

For maximum accuracy, your navigation system

continually compares GPS data with your esti-

mated 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 availa-

ble, 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 reckon-

ing 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 tyre diameter has changed, and auto-

matically replaces the value for calculating

distance.

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

ating in Simple hybrid mode, the distance cal-

culation value cannot be replaced

automatically.

Map matching

As mentioned, the GPS and dead reckoning sys-

tems used by this navigation system are suscepti-

ble to certain errors. Their calculations may, on

occasion, place you in a location on the map

where no road exists. In this situation, the

processing system understands that vehicles

travel only on roads, and can correct your posi-

tion by adjusting it to a nearby road. This is called

map matching.

With map matching

Without map matching

MAN-HD1BT-SOFTW-EN.book Page 164 Thursday, April 20, 2006 3:47 PM

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