Audi NAVIGATION SYSTEM PLUS Specifications download pdf (Page 9)

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Each time it is switched on, the Radio Naviga-

tion System attempts to receive the signals sent

by the satellites.

Reception from at least three satellites is neces-

sary for an accurate position fixing.

Only then can the position of the receiver be

calculated at any point on the earth's surface.

Position calculation

SSP 199-009

SSP 199-010

Global Positioning System (GPS)

The Global Positioning System (GPS) currently comprises

a total of 24 satellites which are evenly distributed over

six orbits at an altitude of approximately 20,000 kilo-

metres. They each circle the earth once every 12 hours.

With this arrangement, every point on the earth theore-

tically has radio contact to at least four satellites.

The satellites radio an ID code, their position

and a high-precision timing signal

earthwards at intervals of one millisecond.

The GPS receiver in the Radio Navigation

System receives the satellite data and calcu-

lates how long the data transmission took by

comparing the timing signal with its internal

high-precision clock.

If the navigation computer receives data

from at least three satellites, it is able to cal-

culate the vehicle's position.

Radio traffic

SSP 199/011

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Audi NAVIGATION SYSTEM PLUS Specifications Page 9