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17 GPS RECEIVER TEST
17.1 GPS FUNCTIONALITY TEST FOR GEOSYSTEM
The GPS antenna or receiver is a device that is capable of receiving information from
GPS satellites and then calculating the device's geographical position using suitable
software.
Time To First Fix (TTFF) is a measure of the time required for a GPS receiver to acquire
satellite signals and navigation data, and calculate the correct position (called FIX).
TTFF can take a few seconds up to a few minutes. After the first Fix, the GPS receiver
saves the satellite information in the internal memory and consequently the time to fix will
be shorter the next time. If the GPS receiver is not used for a long time, the internal
satellite information will be deleted, and the Time to First Fix will be longer because the
receiver will have to identify the current satellite positions again.
Follow the procedure below to check the correct functionality of the antenna
a) Check the correct installation of the hardware devices. In particular, check that the
GPS antenna connector (M12) is property inserted.
b) Switch on the Geosystem and verify that the computer has turned on correctly. If
the display lights up, everything is ok.
c) Switch off the Geosystem and follow the instructions below
M12
Pressure sensor connector
Proportional valve cable
GeoSystem RevA5
F: F
S
LOW
ENSOR
S: S
S
PEED
ENSOR
P: P
S
RESSURE
ENSOR
L: L
S
EVEL
ENSOR
1 ÷ 5: S
V
ECTION
ALVE
C
ABLES
P: P
ROPORTIONAL
V
C
ALVE
ABLE
G: M
V
C
AIN
ALVE
ABLE
FM: F
M
OAM
ARKER
C
ABLE
71
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