Final Report of BeJamDetect Project 
a) top view, without cover 
b) front view 
‚& 
Yan 
Figure 4-5: Miniaturised GALANT platform with four antenna channels 
The base-board includes components that are required to operate the SoM - various voltage 
regulators to provide the supply voltages, an SD card holder for programming and communication 
interfaces such as JTAG port, Ethernet and USB. In addition, the base-board offers further features 
such as a real-time clock, a slot for an inertial-measurement unit, test points and control LEDs, 
antenna connection, button cell holder, on/off switch, etc. 
There is also a connector for plug-in modules on the bottom of the base board. The connector has 
a total of 160 contacts so that even complex modules can be connected. This is used to connect a 
four-channel RF front-end. An evaluation board from NTLab with the designation NT1065_FMC2 
Jsed as a plug-in module (see Figure 4-5a). This module contains an IC of type NT1065, which 
contains four front-end channels. The module also contains the ADC of type LTC2174-14 from 
Analog Devices with four channels, which is used for digital sampling of the received antenna array 
signals. In this way the array signals are already digitized and sent to the base-board via the plug- 
in connector interface. 
The dimensions of the miniaturised GALANT platform including housing are very compact 
144 mm long, 108 mm wide and 56 mm high. The device weighs 480 g 
4.2. Interference detection using real-time graphical interface 
The miniaturised GALANT receiver provides a user-friendly GUI. The GUI is web-based, which means 
that the GUl-page can be opened from any internet browser supporting HTML 5 standard by calling 
the IP-address of the receiver. The individual graphs provided by the GUI allow to detect the 
oresence of radio frequency interference and identify if this interference of jamming or spoofing 
type. With the help of reception patterns, it is also possible to find the direction to the interference 
source. 
The outlook of the GUI under nominal RFI-free GNSS-signal conditions is shown in Figure 4-6. The 
C/NO values of the GPS signals (top right) in track are at levels between 45 dB-Hz and 55 dB-Hz, 
depending on the elevations of the corresponding satellites. The position information (top left) is 
continuously updated. The reception beam-pattern of the pre-whitening pre-correlation processing 
‚right, in the middle) shows no spatial nulls generated to mitigate an RFl-signal. 
Title: Final Report 
Version: 1.0 
age: 40