20.500.12556/RUL-176091 Določanje smeri oddajanja radijskega vira Determining the direction of a radio signal source Diplomsko delo obravnava pasivno določanje smeri vira radijskega signala, pri čemer merilna enota ne oddaja testnega signala, temveč pridobi informacijo zgolj iz sprejetega signala. Cilj naloge je bil raziskati metode za določanje smeri oddajanja radijskega vira in na podlagi tega sestaviti eksperimentalni sistem. V teoretičnem delu so predstavljene različne metode določanja smeri (PoA, TDoA, AoA) ter podana utemeljitev za izbiro interferometrije kot najprimernejšega pristopa. V praktičnem delu je bila metoda izvedena z dvokanalnim programirljivim radiem PlutoSDR, pri čemer so bile izvedene meritve v zaprtih in odprtih prostorih. Podrobno so opisani postopki programiranja sprejemnika, obdelave kompleksnega signala (I/Q vzorcev) in izračuna faznih razlik. Rezultati so pokazali, da na delovanje sistema močno vplivajo motnje zaradi odbojev signala, kar je znana omejitev vseh pasivnih metod za določanje smeri. V zaprtih prostorih z izrazitimi odboji se je pristop z dvoantenskim sprejemnikom izkazal kot nezanesljiv, medtem ko so v odprtih prostorih brez večjih ovir meritve vpadnega kota dosegle natančnost približno ± 9°. Možne izboljšave vključujejo povečanje števila sprejemnih kanalov ter uporabo naprednejših algoritmov, ki eksplicitno upoštevajo vpliv odbojev. This thesis addresses the problem of passively determining the direction of a radio signal source where the measuring device does not emit a probe signal but obtains the information from the received signal. The primary objective was to establish the foundations for a system capable of reliably determining the direction of radio-controlled unmanned aerial vehicles, such as commercial drones. In the theoretical part, various direction-finding methods (PoA, TDoA, AoA) are presented and the use of interferometry is justified as the most suitable approach. In the experimental part, the method was implemented using a two-channel software-defined radio PlutoSDR. The measurements were carried out indoors and outdoors. The programming of the receiver, the processing of the complex signal (I/Q samples), and the calculation of the phase differences are described in detail. The results show that the performance of the system is strongly influenced by multipath propagation, which is a known limitation of all passive direction-finding methods. In closed environments with significant reflections, the dual-antenna receiver proved to be unreliable, whereas in open environments without major obstacles, the angle of arrival could be estimated with an accuracy of approximately ±9°. Potential improvements include increasing the number of receive channels and employing advanced algorithms that explicitly account for multipath effects. določanje smeri AoA primerjava faz obdelava signala motnje zaradi odbojev. direction-finding AoA compering fazes signal processing multipath propagation. true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-11-21 08:01:24 2025-11-21 08:01:27 2026-02-02 14:42:42 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 63096 267014147 Podrekar_Nik_-_Dolocanje_smeri_oddajanja_radijskega_vira.pdf Podrekar_Nik_-_Dolocanje_smeri_oddajanja_radijskega_vira.pdf 1 2384396DEDF92EB350E9C570D8AD7D79 a6844be525a20a350c47f87b272140ecacbd544cf9fa50c6c7e4d82e074dbf4d 8bd9e13d-c6a7-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222307 Fakulteta za elektrotehniko 0 0 0