Final Report of BeJamDetect Project 
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With an increment of the input RF power of almost 5.7dB, this detection comes from June 26, at 
11:30:03 MET and is depicted on Figure 3-16a. The interference is characterized as a continuous- 
wave signal. The RFI signal can be observed over the entire length of the snapshot for 30 ms, 
possibly continuing during dead-time period. In the freguency-domain the interference signal is 
characterized by a 244.2 kHz bandwidth, centered at the carrier frequency of 1572.95 MHz, ie. 
2.47 MHz below the L1 carrier (see Figure 3-16b,c). This proximity seems a clear indication of 
intentional interference, especially due to the high-power irradiated on the top antenna. 
In the time-domain the continuous-wave has fast oscillations that reach a maximum amplitude 
approximately constant throughout the snapshot (see Figure 3-17a) and a lower-freguency 
behavior resembling a sinusoid envelope involving the fast oscillations (see Figure 3-17b). Periods 
are unknown, but there are visual indications of uninterrupted periodic behaviors during the 
recording. 
Spectogram, L1 band, antenna 5 
© -50 
> 100 
© 150 
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X 
1600 
{RC r. 
ar 
157. 
Fequ 
8NCy 
(MHz) 18° 
time (ms) 
a) Spectrogram of continuous RFI above noise-level 
Power Spectrum Density, L1 band, antenna 5 
Power Spectrum Density, L1 band, antenna 5 
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a ul 
A 
l 
so 
244.2 kHz 
3 — 
1550 1560 
1570 7580 1590 1600 1610 
frequency (MHz) 
572.85 
(amd m (am! 
1572.9 1572.95 1573 1573.05 
fraquency (MHz) 
o) PSD: continuous RFI peak and carrier c) PSD plot zoomed: RFI bandwidth 
Figure 3-16: Continuous RFI on June 26, 2021 at 11:30:03 MET 
Title: Final Report 
Version: 1.0 
age: 23