Vicom Orolia InfiniDome GPSdome 1.02b EPS User manual
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GPSdome 1.02b - EPS
Installation Manual
1064 Centre Rd
Oakleigh South Vic 3167
Australia
1300 360 251
www.vicom.com.au
Grd Floor, 60 Grafton Road
Auckland 1010
New Zealand
+64 9 379 4596
www.vicom.co.nz
Vicom New Zealand
For More Information: Vicom Australia
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Contents
Introduction .........................................................................................................................................................................................3
Interfaces .............................................................................................................................................................................................3
Technical Specification.........................................................................................................................................................................4
Installation ...........................................................................................................................................................................................4
Before installation............................................................................................................................................................................4
Unpacking and inspecting equipment .............................................................................................................................................4
Where to install................................................................................................................................................................................4
GPS Receiver System with GPS Dome..............................................................................................................................................5
SMA Cables Connectors ...................................................................................................................................................................5
Installation procedure..........................................................................................................................................................................6
General Operation ...........................................................................................................................................................................7
Help and Support .................................................................................................................................................................................8
Specifications ...................................................................................................................................................................................8
Maintenance ....................................................................................................................................................................................8
Troubleshooting...............................................................................................................................................................................9
Interference Indication ......................................................................................................................... Error! Bookmark not defined.
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Introduction
Thank you for buying GPS dome.
GPSdome is a small-sized, add-on device that provides protection against GPS jamming and spoofing,
ensuring continuity of autonomous navigation and operation during jamming and spoofing conditions.
No other solution that offers such protection is as small, light, affordable or as easily installed as GPSdome.
The unit may be installed on a range of installations that rely on GPS and connects between the antenna and
the GPS receiver.
Two active GPS antennas, with nominal gain of 26dB, are connected to the SMA RF connectors; the primary
and auxiliary antenna inputs. The RF Output provides connection to the input of the GPS Receiver.
Interfaces
(R) output to the GPS receiver SMA.
Primary Antenna Input (P) - 50Ω SMA 2.75VDC designed for 26dB ±2dB gain.
Auxiliary Antenna Input (A) - 50Ω SMA 2.75VDC designed for 26dB ±2dB gain.
Power Input:
Red: 3.3VDC – 32VDC (0.75W)
Black: GND
Brown: Open drain interference indication. (This wire sends an indication when the unit is detecting
and protecting against a hostile signal).
GPS dome 1.02b -EPS – General view
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Cautions
(1) The GPS DOME module should be mounted on a flat surface where possible and
secured using the mounting holes provided.
(2) To prevent damage to any cable assemblies used in this installation, ensure the cables
are not bent, deformed or snagged to cause damage to the internal wiring or the
connector ends.
(3) This product is a high-tech electronics module, installation must be
performed by a professional installer.
(4) During installation ensure there is NO power applied to the module. Make sure the
GPS receiver is powered off.
Technical Specification
Size
70mm * 48mm * 24mm
Weight
150g
Operation temperature
-40ᵒC - 85ᵒC
Water resistance
IP67
CE
Installation
Before installation
Please verify that the following equipment is available:
•GPSdome V1.02b – EPS
•2 units of 26dB ±2dB gain antennas, 2.75VDC (from the same type) with 50Ω cable and SMA
connector (length of the cables should be identical).
•SMA coax cable from GPSdome (R) connector to the receiver
•RF converters to SMA (if needed)
•3.3VDC – 32VDC power source
Unpacking and inspecting equipment
When unpacking equipment, make a visual inspection for evidence of damage incurred during shipment. The
following parts should be included:
•(R), (P) & (A) SMA connector – please verify that the connectors are not damaged, and the thread is
complete.
•Verify that the external power supply is not damaged.
•Make sure that the unit does not have any dents.
Where to install
GPSdome – locate and secure the GPSdome with the power cable appropriately sized to reach the power
source and the antenna cables trimmed in equal lengths to provide adequate separation and connection to
GPSDome. (See Step 2 in Installation Procedure below).
Antennas – locate and secure the antennas in full sky visibility, on the same horizontal plane, for maximum
GNSS signal reception.
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GPS Receiver System with GPS Dome
The GPS DOME module is integrated into the static or vehicle GPS receiver as shown in Figure 3. Two
antennas are connected to the module (supplied antennas or locally purchased for permanent installation); the
GPS antenna connects to primary input ‘P’ and an additional antenna connects to the auxiliary input ‘A.’
Figure 3
GPS RF signal at
Active
1575MHz
Antenna
GPS Receiver
GPS Dome
DC feed 2.75VDC
(Existing)
& GPS Signal
Active
Antenna
Power
Power DC
Source
feed 3-32V
(existing)
GPS Receiver with GPSdome 1.02b - EPS Integrated
SMA Cables Connectors
To prevent the risk of moisture ingress, it is recommended that a cable with high quality sealed SMA
connectors (see figure below) is used to connect between the GPSdome module and the GPS receiver unit.
Please use high quality RF cables with double shielded. Single shielded coaxial cable is not suitable. If
alternative antennas are installed the same cable specification and SMA connectors are required.
Unsealed and Sealed SMA Connectors
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Installation procedure
Step 1. mount GPSdome
a) Mark out and drill four holes suitable for M3 screws.
b) Allowing for ease of cable connection, align the GPSdome to the holes.
c) Secure the GPSdome using appropriate fixings (not included), such as four self-tapping M3 screws.
Step 2. Installation of the Antennas
With reference to physical installation, the location of the two antennas to be fitted is as follows:
•Locate the antennas on a suitable area on a horizontal surface that always faces the sky, e.g. on the
roof area.
•Avoid placing the antennas near obstacles including: roof racks, other antennas such as AM/FM and
cell phone or air-conditioning devices that could block a clear view of the sky, preventing the satellite
signals from reaching the antenna.
•Ensure that there is a distance of at least 15cm between the two antennas.
•Route the antenna cables away from moving parts, under carpet and behind plastic trim, to the GPS
DOME module location.
GPSdome Mechanical Interface
To prevent damage to any cable assemblies used in this installation, ensure cables
are not bent, deformed or snagged to cause damage to the internal wiring or the
connector ends.
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Tips:
•Keep the cable between the GPSdome and the GPS receiver short.
•Locate the GPS antennas as far away from other RF jamming sources as possible.
•There are large variations in the performance of GPS receivers supplied by different manufacturers.
GPSdome adds an anti-jam capability to all receivers, but the overall anti-jam performance of the
combined system will depend on performance characteristics of the receiver.
•GPSdome reduces jamming signals that enter the receiver through the antenna port. However, a
poorly - designed receiver can also absorb the jamming signal through the body of the receiver itself.
A good receiver will have EMC shielding to prevent leakage of RF radiation through its sides; if this
is not the case, and a better receiver can’t be used, install the receiver in a shielded case.
•If possible, increase the distance between the GPSdome antennas and any jamming source. For
example, if there is a jammer operating from the cigarette lighter socket in a car, locate the antennas
towards the rear of the vehicle.
•If GPSdome is installed in a complex environment, such as a vehicle, experiment with the placement
and orientation of the antennas for best results. Due to the complex propagation environments within
vehicles, different installation options may produce a higher or lower performance.
Step 4. Coax cabling
Connect and secure the following cables to the GPSdome module using an SMA torque spanner set to 1Nm
(8.85 in-lbs):
a) Antenna 1 cable connector to the auxiliary antenna input ‘A’ connector.
b) Antenna 2 cable connector to the primary antenna input ‘P’ connector.
c) The RF output to receiver ‘R’ connector using a locally sourced cable fitted with high quality sealed
SMA connectors. The other end connected into the GPS receiver RF antenna input.
Step 5. External power supply
Verify that the DC provided on the receiver cable is 3.3VDC - 32VDC and can provide at least 800mW of
power.
a) Connect the red wire to +V (3.3VDC – 32VDC)
b) Connect the black to common (GND).
c) When interference indication is required, use the brown wire (and the same common – black), in
accordance with interference indication
Caution: Make sure you connect the DC + to the red wire and
the common/ground to the black
Step 6. Coil and secure any excess of antenna cable and power wires into a hidden location, such as under
the carpet, using wire ties (not supplied).
General Operation
The GPS DOME module operates without manual intervention.
Two LEDs located on the GPS DOME module, provide the following indications:
LED 1 - When the module is powered ON and operating correctly, a green LED is steady on.
LED 2 –When the presence of a jamming event is detected, a red LED is steady on.
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Help and Support
Specifications
Item Parameter Description/notes Value Units
Min. Typ. Max
Physical Operational Environmental
1 Temperature -40 25 +85 ˚C
range
Default System Configuration
RF Specification
2 Protected GPS L1 1575.42 MHz
frequency
Power Supply Specification
3 Supply Receiver DC line +3 +32 Volt
Voltage
4 Supply Including antennas 0.75 Watt
Consumption
5 Antenna Voltage 2.75 Volt
Bias Current per o/p 10 25 mA
Self re-setting fuse 200 mA
Antenna parameters
Item Description Value Units
Min. Typ. Max.
Type Active GPS Patch n/a
Elements 2 n/a
Gain 30 dB
Noise Figure 2 dB
Supply Voltage 2.75 Volt
Supply Current 2 10 20 mA
Maintenance
GPS DOME does not contain any user-serviceable parts and contains no moving parts. With reference to the
CAUTIONS on page 3, no maintenance is required apart from examining all the cable assemblies for secure
connection, damage and corrosion.
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Troubleshooting
Nothing is working and my GPS receiver does not acquire lock
Complete the following steps, in order:
•Check that there are no obstructions (e.g. buildings, tunnels) around or above the installation; move to
another location as necessary.
•Isolate any internal jamming sources; switch off all other electronic devices.
•Check all cable connections for damage, excessive bending and that they are correctly secured.
•Check the GPS receiver functions correctly when connected directly to ONE antenna, without
GPSdome connected. Repeat with the other antenna. If both antennas are confirmed as OK, then
reconnect GPSdome.
•Check that the antennas are connected to GPSdome ‘P’ and ‘A’ connectors, and that the SMA
connectors are tightened.
•Check that the GPSdome ‘R’ connector is connected to the GPS receiver, and that the SMA
connectors are tightened at both ends.
•Check that 3.3VDC - 32VDC external power is connected from the GPSdome to an applicable power
source.
•Check that the green LED is ON when an active GPS receiver is connected.
Interference indication
The custom integrated circuit at the core of GPSdome has an open drain output to indicate the presence of
jamming or spoofing events. Its switch point is a function of external antenna LNA gain and so cannot be
precisely specified.
Please note that this connection is optional
Please read the following information:
The open drain circuit inside GPSdome (left hand side of Figure 1) connects to the “brown” wire. In case of
reception without jamming or spoofing, the Control FET is off, and the jamming detect wire is open circuit
for DC voltages applied up to wire. When jamming is detected, the Control FET connects the internal 1k
resistor to ground.
In order to translate the interference indication (brown wire) to logic level signal, connect the brown wire to
DC voltage in the customer equipment via pullup resistor.
Jamming Detect Output Circuit
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