Final Report of BeJamDetect Project 
Spectogram, L1 band, antenna 2 
3 40. 
; 3 
a 
3 140. 
x 
N 
2 
3 
LE 
DB. 
7-12 
De 
z 140 
X 
1600 
Spectogram, L1 band, antenna 5 
bo 
15€ 
TequenCcyY (MHz) 
a) Prior pulsed RFI at 10:58:57 
time (ms} 
fregquency (MHz) 
CE 
time (ms 
b) Subsequent continuous-wave RFI at 12:23:34 
Power Spectrum Density, L1 band, antenna 5 
BE 
2 
5 | 
f 
un 
244.1 kHz 
bu ni 
1577 96 
A 1573.05 1573.1 4572 4 
freQuency (MHz) 
c) Bandwidth of subsequent continuous RFI at 12:23:34 
Figure 3-19: Prior and subsequent recordings to the hotspot on June 26 11:30:03 
A coarse estimation of the direction of arrival can be performed by assessing which antenna 
alements received the most of the signal power. As can be observed in Figure 3-20a, the most 
affected antennas are elements 5, 7 and 2. Since the power of the RFI signal and the indices of the 
affected antennas changed with the time (compare Figure 3-20a and b), it can be concluded that 
the RFI source is probably not on the board of the ship DENEB and became distant. The noticeable 
received power by antennas 2 and 1 in Figure 3-20 can be an effect of the reflecting of the RFI 
signal by the ship infrastructure (i.e. multipath effect appearing for the RFI signal). 
Fitle: Final Report 
Version: 1.0 
age: 25