4
Functions
Funzioni
ATHON GPS
carries out the following basic functions:
ATHON GPS
svolge le seguenti funzioni base:
GPS Chrono with airborne algorithms.
Cronometro GPS con algoritmi aeronautici.
Double Hour Meter.
Doppio Contaore.
Enginespeed indicator.
Contagiri motore.
Calendar.
Calendario
.
GPS Tachometer.
Tachimetro GPS.
Clock.
Orologio
.
Shift Light.
Flash di Fuorigiri
Several advanced functions are available for the various models of the ATHON GPS range and they are
described here below in the specific manual sections.
Diverse funzioni avanzate sono disponibili per i vari modelli della gamma ATHON GPS e sono illustrate di
seguito nelle specifiche sezioni del manuale.
INTRODUCING THE GPS TECHNOLOGY
INTRODUZIONE ALLA TECNOLOGIA GPS
In 1991, the USA opened the SPS (Standard Positioning System) service, other than PPS (Precision
Positioning System), the military one, to the world. SA (Selective Availability) introducing intentional errors into
satellite signals was practically brought in.
GPS was created to replace Transit, i.e. the previous system, when the USA renounced Selective Availability
and made the former system as accurate as the latter and it is supported by a system of 24 artificial satellites.
Till May 2000, the signal for civilian use was degraded to reduce accuracy up to 100-150 m through Selective
Availability (SA). From then on, signal degradation was disabled by virtue of a decree by Bill Clinton, the
President of the United States, so as to reach the current degree of accuracy that can usually reach levels of
less than 1 m. The models for civilian use are complete with a device inhibiting operation at heights and
speeds above well-defined values in order to avoid its assembly on improvised missiles.
The EU is planning to complete its own network of satellites (Galileo) for civilian purposes, including GPS. This
project is of strategic significance since the American network is owned by the USA only and managed by
military authorities who might decide to reduce accuracy or to selectively lock the access to the system. An
investment and a property shared by the States using it are a guarantee of the service continuity, accessibility
and interoperability.
•
The navigation system is subdivided into the following components:
•
An ensemble of 24 satellites
•
A network of tracking stations
