Estação terrena receptora para nanosatélites de baixa órbita - implementação através de rádio definido por software

Abstract

With the popularization of software-defined radio, more and more applications are being developed in a simplified way through software instead of hardware. Given the context, there are numerous applications related to the TTeC segment of nanosatellites. In this scenario, the present research aims to propose the project of a receiving ground station implemented through software defined radio. To fulfill this objective, a methodology was defined, as well as numerous tasks ranging from the link budget to the test of demodulators, using software res such as MATLAB, 4NEC2, MATHCAD and GNU Radio. As a result, a link budget was defined for the link between ground station and nanosatellite, a yagi-uda antenna was designed, built and preliminarily tested in the laboratory as well as the test and implementation of demodulators and decoders in the GNURadio software. Two demodulators were proposed to work with modulations schemes used in the dissertation as well as the implementation of the decoding segment. Also, a methodology was developed to work with beacons in GNURadio, resulting in telemetry data sent by an cubesat. Finally, there was contact with a cubesat present in low orbit, integrating the SDR, antenna and computer segments