Effects of Building Movement on Low Beamwidth Satellite Receiving Antennas

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Dr. Csurgai-Horváth László
Department of Broadband Infocommunications and Electromagnetic Theory

The Budapest University of Technology and Economics, Department of Broadband Infocommunications and Electromagnetic Theory participates in the Alphasat telecommunication experiment of the European Space Agency, in which a satellite receiver station have been evolved in the V1 building of the university. Although the satellite moves on a geosynchronous orbit, a satellite tracking is necessary.

The receiver antenna has a very narrow 3 dB beamwidth, which has a value of 0.3°. However, with such a tight beamwidth are emerging issues, like the satellite tracking accuracy. The accuracy can be affected by factors, like the movement of the building caused by several reasons, like the wind, thermal expansion, etc. Therefore, it seems necessary to use an inclinometer, whose measurements can be used for the satellite tracking.

As my master thesis I have chosen to develop an electrical inclinometer, which makes possible to measure the movements of buildings with a very high precision and to use that data while tracking the satellite. This will enable to avoid the effects of the building movement in the received signal strength.

In that thesis I will describe the structure of the receiver station in Budapest, the Aldo Paraboni experiment, I will show the phases of the development, the calibration process of the device, and the results of the measurements with respect to the building movement as well. From that results I will make a conclusion, from which it becomes clear, whether the movement of the building affects significantly the received signal strength coming from the Alphasat satellite.


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