Final Report of BeJamDetect Project 
L1 band, Input power at central array element 
—_ tn TUT m 
‚—— A Pi at Ant#7 {dB} 
Strong RFI 
Medium RFI 
Weak RFI 
a 
{ 
+4 ) 
M-Jun 07-Jun 10-Junm 13Jun 16Junm 19Jun 22-Jun 26-Jun 28-Jun 
GPS time. 0 = 01-Jun-2021. 00:00:00 2027 
Figure 3-8: Input power increase for classifying RFI in strength 
And the increase of received power over an entire measurement campaign Is shown in Figure 3-9. 
L1 band, Input power at central array element 
—— APin at Ant#7 (dB) 
= ===: 1dB weak RFI threshold | 
= = '3dB medium RFI thrashold 
— 5dB strong RFI threshald 
ft 
U1-5ep O1-0c 
GPS time, 0 = 01-Jul-2021, 00:00:00 
g 
1-NOv 
Fan 
2027 
Figure 3-9: Increase of antenna array central element's input power due to RF interference 
If more than one snapshot of interest is taken in sequence, then all are gathered in the same event, 
zlassified in strength level by the strongest among them. “In sequence” here means snapshots 
triggered by RFI detection that were recorded in sequence. 
Sometimes the time interval between snapshots can be approximately equal to the dead-time 
period (30 s) or much larger (such as 40 minutes). Big time differences between consecutive RFI 
snapshots don’t necessarily mean that the interference events were brief and halted between the 
time of the snapshots. It might be the case of environmental or other electronic conditions that 
momentarily reduced or shadowed the interference signal influence over the receiver. Thus, 
consecutive snapshots are gathered as part of the same event. 
Pre- and post-correlation processing were performed and yielded several results for analysis. Pre- 
correlation processing produced spectrograms, power spectrum densities (PSD), time plots and 
Nitle: Final Report 
Version: 1.0 
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