Suggestion for design of a lightning conductor for a GNSS system:
1. On non-metallic structures
Protection by air terminals is recommended. An air terminal is a pointed solid or tubular rod
of conducting material with proper mounting and connection to a conductor. The position of
four air terminals can be uniformly distributed around the antenna at a distance equal to
the height of the air terminal.
The air terminal diameter should be 12 mm for copper or 15 mm for aluminium. The height
of the air terminals should be 25 cm to 50 cm. All air terminals should be connected to the
down conductors. The diameter of the air terminal should be kept to a minimum to reduce
GNSS signal shading.
2. On metallic structures
Protection is as described for non-metallic structures, but the air terminals can be connec-
ted directly to the conducting structure without the need for down conductors.
a Antenna
b Support structure
c Air terminal
a Antenna
b Lightning conductor array
c Antenna/instrument connection
d Metallic mast
e Connection to earth
WARNING
Incorrect fastening of the external antenna
Incorrect fastening of the external antenna to vehicles or transporters poses the risk of the
equipment being broken by mechanical influence, vibration or airstream. This may result in
accident and physical injury.
Precautions:
▶
Attach the external antenna professionally. The external antenna must be secured addition-
ally, for example by use of a safety cord. Ensure that the mounting device is correctly
mounted and able to carry the weight of the external antenna (>1 kg) safely.
Lightning conductors
Air terminal arrangement,
plan view
Grounding the
instrument/antenna
7
Safety Directions
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