Pioneer AppRadio SPH-DA01 User Manual download pdf (Page 28)

Positioning technology

Positioning by GPS

The Global Positioning System (GPS) uses a

network of satellites orbiting the Earth. Each

of the satellites, which orbit at a height of

68 900 000 feet (21 000 km), continually broad-

casts radio signals giving time and position in-

formation. This ensures that signals from at

least three can be picked up from any open

area on the ground’s surface.

The accuracy of the GPS information depends

on how good the reception is. When the sig-

nals are strong and reception is good, GPS

can determine latitude, longitude and altitude

for accurate positioning in three dimensions.

But if signal quality is poor, only two dimen-

sions, latitude and longitude, can be obtained

and positioning errors are somewhat greater.

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

! GPS positioning is disabled if signals can-

not be received from more than two GPS

satellites.

! 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 has 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.

Conditions likely to cause

noticeable positioning errors

For various reasons, such as the state of the

road you are traveling on and the reception

status of the GPS signal, the actual position of

your vehicle may differ from the position dis-

played on the map screen.

En

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Appendix

Appendix

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