Design and test of the automatic Morse beacon system of the OUFTI-2 nanosatellite
Promotor(s) : Embrechts, Jean-Jacques
Date of defense : 26-Jun-2019/27-Jun-2019 • Permalink :
|Design and test of the automatic Morse beacon system of the OUFTI-2 nanosatellite
|Date of defense :
|Committee's member(s) :
|Van Droogenbroeck, Marc
|Engineering, computing & technology > Electrical & electronics engineering
|Université de Liège, Liège, Belgique
|Master en ingénieur civil électricien, à finalité spécialisée en "electrical engineering"
|Master thesis of the Faculté des Sciences appliquées
[en] OUFTI-2 is an educational satellite under development at the University of
Liège. It is a 1 liter CubeSat, the main payload of which is a homemade radio
repeater featuring D-STAR digital, amateur-radio communications. A main
secondary payload is dedicated to the test of an innovative type of shielding that
can protect electronic systems against space radiations. OUFTI-2 is expected
to be deployed from the ISS, with a mission duration of about 6 months.
One important subsystem of the nanosatellite OUFTI-2 is the beacon system.
The beacon continuously emits successive frames which describe the satellite
state. These frames are emitted at both a low and a high rate, which are
respectively 12 wpm and 2400 bauds. In the case where other subsystems of
the satellite might be damaged, in particular the communication subsystem,
the beacon is a diagnostic tool which informs of the essential parameters of the
satellite. The beacon is also really helpful in normal operation since its low rate
Morse signal can easily be captured and decoded by worldwide amateur radio
operators. These operators can therefore send decoded signals to the OUFTI-2
team, which is extremely useful in order to have a permanent monitoring of the
satellite, especially when it is not above Liège. Regarding the high rate signal,
it is a great tool to acquire updated satellite information faster, however, no
decoding system of this frame was designed yet.
The first contribution of this work is to assess the correct functioning of the
beacon by measuring its RF parameters. The paper will describe the procedure
followed to measure the RF parameters and why they will eventually need a
The second contribution is to implement a system that can decode the 2400
bauds frame, based on different devices. Results will show that the implemented
system is able to decode signals of which power might get down to -100 dBm.
Cite this master thesis
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