Final Report of BeJamDetect Project 
On the 7* of July, one of the array antenna elements started to deliver much less signal power than 
the other three elements. This was caused by malfunctioning of the 5V power supply of that active 
array element. One of the effects of this power outtage was the systematically increased spread of 
the eigenvalues and, as a consequence, a bias in the RFI detection metric. The start of the 
appearance of this bias can be observed in Figure 4-23 on the 7* of July. Because the other three 
array elements continued to operate normally, the RFI detection metric can still be used. 
As can be observed in Figure 4-24 and Figure 4-25, the periods of increased RFI activity did not lead 
to the disruption of Demonstrator 2. However, in the first (around the 7* of July) and the second 
‘around the 14* of July) such periods some decrease of the number of GPS satellites used for PVT 
and noticeable drop of the C/NO values can be observed and probably attributed to the interference 
affect. 
Time evolution of PRNs in PVT and in trac: 
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— tracked, GPS L1-C/A 
— t'racked, GAL E1-B 
UTC time 
nl 
28-Jul 
2022 
"Igure 4-24: Number of GPS L1-C/A signals being tracked and used for PVT, July 2022 
Time evolution of mean CNO values 
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31 
30 
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3 
14-Jui 
UTC time 
ZU 
28-Jul 
2022 
Figure 4-25: Mean C/NO value for GPS L1-C/A signals, July 2022 
Title: Final Report 
Version: 1.0 
age: 55