Spatial FOG Reference Manual
Page 37 of 144
Version 2.3
03/05/2018
The standard antenna supplied in the Spatial FOG evaluation kit is the Antcom G5Ant-
53A4T1. It is an L1/L2/L5 RTK antenna that supports GPS, GLONASS, BeiDou, Galileo,
Omnistar and SBAS. It is environmentally sealed to the IP68 standard.
If you are supplying your own antenna it is important to ensure that the antenna is
able to receive all constellations and not just GPS, otherwise you will not achieve full
performance. It is also important to select an IP67 antenna with an IP67 SMA
connector, otherwise the system will not be environmentally sealed.
It is recommended to use an antenna with the following characteristics:
•
The antenna should be capable of receiving GPS, GLONASS and BeiDou.
•
If the unit is being used for RTK, the antenna needs to be capable of receiving
both L1 and L2. It should also have an accurate phase centre.
•
The antenna should have a minimum LNA gain of 29dB and a maximum gain of
50dB.
•
The antenna should be environmentally sealed, including connectors.
If you are sourcing your own antenna cables it is important to ensure that the antenna
has enough gain to support the loss over the cable. Spatial FOG requires a minimum of
29dB of gain at the connector. With the standard 4 metre LMR240 antenna cables
supplied by Advanced Navigation, the minimum antenna gain is 30dB.
9.6
GNSS Antenna Cables
The antenna cables should be routed away from powerful RF emitters, high current
wiring, high temperatures and any rotating or reciprocating machinery. It is very
important not to bend the antenna cable beyond it's maximum bend radius. It is
recommended to use wide cable ties and be careful not to do them up too tight.
Advanced Navigation recommends using either RG58 low loss or LMR240 coaxial cable
combined with high quality connectors. LMR300 and LMR400 can also be used to
minimise loss for very long antenna cables.
Illustration 17: Spatial FOG antenna ofset
isometric view
Illustration 18: Spatial FOG antenan ofset front
view
Содержание Spatial FOG Dual
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