20.500.12556/RUL-188201 Ultrazvočna lokalizacija sopotapljača Ultrasonic localization of a companion diver V zaključni nalogi smo zasnovali in izdelali funkcionalni prototip naprave, namenjene lokalizaciji sopotapljača pri potapljanju v primeru nenadno zmanjšane vidljivosti ali nezmožnosti običajne komunikacije. Sistem temelji na treh ultrazvočnih sprejemni- kih, nameščenih v oglišča enakostraničnega trikotnika. Fazo zaznanega sinusnega signala smo določili z I/Q-demodulacijo, iz faznih razlik med sprejemniki pa s fazno interferometrijo izračunali smer oddajnika v ravnini sprejemnikov. Načrtovali smo elektronsko vezje sprejemnega sistema, izdelali podvodne pre- dojačevalnike in njihovo vodotesno zaščito. V programskem jeziku Python smo razvili algoritem za obdelavo signalov in izračun vpadnega kota. Delovanje sistema smo preverili z meritvami v bazenu pri različnih vpadnih kotih in razdaljah med oddajnikom in sprejemniki. Rezultati so pokazali, da je smer oddajnika mogoče določiti, vendar je bila natanč- nost odvisna od vpadnega kota in razdalje. Zaporedne meritve pri isti postavitvi so bile večinoma dobro ponovljive, hkrati pa so bila pri nekaterih postavitvah prisotna večja sistematična odstopanja od pričakovane smeri. Izdelani prototip tako potrjuje izvedljivost osnovnega principa, za praktično uporabo pa bi bile potrebne nadaljnje izboljšave mehanske postavitve, kalibracije in elektronskega dela sistema. We designed and built a functional prototype of a device intended to assist in locating a diving partner in situations of unexpectedly reduced visibility or limited communication. The system is based on three ultrasonic receivers positioned at the vertices of an equilateral triangle. The phase of the detected sinusoidal signal was determined using I/Q demodulation, while the direction of the transmitter in the plane of the receivers was calculated from the phase differences using phase interferometry. We designed the electronic circuitry of the receiving system, constructed the underwater preamplifiers and their waterproof protection, and developed a signal- processing algorithm in Python for determining the angle of incidence. The system was tested in a swimming pool at different angles of incidence and at different distances between the transmitter and the receivers. The results showed that the direction of the transmitter could be determined, but the accuracy depended on the angle of incidence and the distance. Consecutive measurements at the same setup were generally highly repeatable, while larger sys- tematic deviations from the expected direction were present in some configurations. The prototype therefore demonstrates the feasibility of the basic principle, although further improvements to the mechanical setup, calibration, and electronic circuitry would be required for practical use. ultrazvok fazna interferometrija lokalizacija I/Q-demodulacija piezoelektrični pretvornik določanje smeri ultrasound phase interferometry localization I/Q demodulation piezoelectric trans- ducer direction finding true false false Slovenski jezik Angleški jezik Zaključna naloga 2026-09-19 08:16:04 2026-09-19 08:16:09 2026-09-21 11:19:06 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 164617 291595523 24390.pdf 24390.pdf 1 95460B6B41CF611E64503FAD0BE93136 93042c9e15c36b587878e24e768656fb572b4759937196dbbf274d4ee48bd6e8 8cf3fb68-b3f1-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=248230 Fakulteta za matematiko in fiziko 0 0 0