Primary Electrical Power Supply System of Smog-1 PocketQube

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Dudás Levente
Department of Broadband Infocommunications and Electromagnetic Theory

SMOG-1 is a PocketQube sized satellite, developed by mechanical- and electrical engineer students of Budapest University of Technology and Economics with the help of lecturers. The onboard spectrum analyzer will be measuring the electromacgnetic pollution caused by terrestrial broadcast antennas. This is called electromagnetic smog, hence the name of the satellite. The frequency band of the DVB-T system, which will be monitored is between 460 MHz and 860 MHz.

Because of the size and weight limitations, only low power telemetry and communication system was used. The life span of the satellite is mainly determined by the energy available, thus having a continuous and reliable energy source is crucial, none of the subsystems would work without it . Providing this energy is the task of the primary Electrical Power System, which I will be presenting in this thesis.

Sunlight is the only renewable energy source in space, so the energy required by the on-board systems must be provided by it. The incident radiated electromagnetic energy by the sun is converted to conducted electric energy by the solar cells installed on each side of the cube. The power output from the cells is maximized by the MPPT module, which also charges the battery of the satellite. The regulated supply voltage is then provided by the secondary EPS, which generates the power needed by the payload and other subsystems.


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