Audi NAVIGATION SYSTEM PLUS Dokumentacja Pobierz pdf (Strona 8)

Basic principles

SSP 199-007

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The Global Positioning System (GPS) makes satellite

navigation possible.

The Global Positioning System was originally

developed for military purposes by the US Ministry of

Defence.

For military reasons, the quality of the transmitted

satelIite data for position finding is deliberately redu-

ced for civilian use using a special procedure.

The military version uses a type of random-number

generator that "hashes" the radio signals containing

the satellite data. The encrypted corrective data which

is transmitted in parallel cannot be decoded by civi-

lian GPS receivers. For civilian use, therefore, it is only

possible to determine positions accurate to ±100

metres.

The Global Positioning System

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Audi NAVIGATION SYSTEM PLUS Dokumentacja Strona 8