Spatial FOG Reference ManualPage 37 of 144Version 2.303/05/2018The 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 isable to receive all constellations and not just GPS, otherwise you will not achieve fullperformance. It is also important to select an IP67 antenna with an IP67 SMAconnector, 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 receivingboth 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 of50dB.• The antenna should be environmentally sealed, including connectors.If you are sourcing your own antenna cables it is important to ensure that the antennahas enough gain to support the loss over the cable. Spatial FOG requires a minimum of29dB of gain at the connector. With the standard 4 metre LMR240 antenna cablessupplied by Advanced Navigation, the minimum antenna gain is 30dB.9.6 GNSS Antenna CablesThe antenna cables should be routed away from powerful RF emitters, high currentwiring, high temperatures and any rotating or reciprocating machinery. It is veryimportant not to bend the antenna cable beyond it's maximum bend radius. It isrecommended 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 cablecombined with high quality connectors. LMR300 and LMR400 can also be used tominimise loss for very long antenna cables.Illustration 17: Spatial FOG antenna ofsetisometric viewIllustration 18: Spatial FOG antenan ofset frontview
