Pioneer F90 Operations Manual download pdf (Page 166)

Map matching

As mentioned, the positioning systems used

by this navigation system are susceptible to

certain errors. Their calculations may, on occa-

sion, 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 positio n by ad-

justing it to a nearby road. This is called map

matching.

With map matching

Without map matching

Handling large errors

Positioning errors are kept to a minimum by

combining GPS, “Dead Reckoning” and map

matching. However, in some situations, these

functions may not work properly, and the error

may become bigger.

When positioning by GPS is

impossible

! If signals cannot be received from more

than two GPS satellites, GPS positioning

does not take place.

! In some driving conditions, signals from

GPS satellites may not reach your vehicle.

In this case, it is impossible for the system

to use GPS positioning.

In tunnels or en-

closed parking

garages

Under elevated

roads or similar

structures

When driving

among high build-

ings

When driving through

a dense forest or tall

trees

! If a car phone or cellular phone is used

near the GPS antenna, GPS reception may

be lost temporarily.

! Do not cover the GPS antenna with spray

paint or car wax, because this may block

the reception of GPS signals. Snow buildup

can also degrade the signals, so keep the

antenna clear.

p If a GPS signal have not been received for a

long time, your vehicle’s actual position

and the current position mark on the map

may diverge considerably or may not be up-

dated. In such case, once GPS reception is

restored, accuracy will be recovered.

Appendix

En

166

Appendix

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