20.500.12556/RUL-139096 Ocena kota prihoda signala z uporabo tehnologije Bluetooth Low Energy in poljem anten Angle of arrival estimation using BLE technology and antenna array Zasnovali smo sistem za oceno kota prihoda signala s tehnologijo nizkoenergij- skega Bluetootha, ki je z namenom bolj natančnega določanja lokacij naprav, v standard verzije 5.1 dodal funkcionalnost za oceno kota prihoda signala (ang. angle of arrival, AoA). Kot prihoda signala se oceni na podlagi faznih razlik, ki nastanejo zaradi različnih dolžin potovanja signala do več anten. Zasnovali smo krožno polje anten z 12 navpičnimi monopolnimi antenami in RF stikali za izbiro aktivne antene. Za oceno kota prihoda signala smo uporabili kombinacijo zasno- vanega polja anten in algoritma MUSIC. Omenjeno kombinacijo smo primerjali s kombinacijo polja anten BOOSTXL-AOA in trivialnega algoritma. Natančneje smo opisali metodi za (1) izračun fazne korekcije zaradi neusklajenosti nosilnih frekvenc sprejemnika in oddajnika ter (2) izračun fazne razlike s trivialnim algo- ritmom. Analizirali smo vplive, ki dodajo fazno napako v sistem. Sistema smo ovrednotili z meritvami v delno kontroliranem okolju in v zaprtem prostoru. Z al- goritmom MUSIC in zasnovanim poljem anten smo v delno kontroliranem okolju dosegli natančnost kota prihoda signala do 1° . V zaprtem prostoru smo zaradi večpotnega razširjanja signala na nekaterih kanalih dobili napačne ocene kotov, ki jih je v enostavnih okoljih možno zaznati in izločiti. Trivialen algoritem v kombi- naciji z uporabljenim poljem anten BOOSTXL-AOA omogoča grobo oceno kota signala v kontroliranem okolju. Zaradi velike razpršenosti ocen je treba izračunati povprečje več ocen kotov prihoda signala. The thesis addresses the implementation of an angle of arrival estimation system using Bluetooth Low Energy, which added an angle of arrival (AoA) estimation feature to more accurately determine the location of devices. The angle of arrival is estimated based on the phase differences caused by the different signal prop- agation times to multiple antennas. We designed a circular antenna array with 12 vertical monopole antennas and RF switches to select the active antenna. We used the combination of the designed antenna array and the MUSIC algorithm to estimate the angle of arrival of the signal. This combination was compared with the combination of the BOOSTXL-AOA antenna array and the trivial algorithm. We have described the methods for (1) calculating the phase correction due to mismatches in the carrier frequency of the receiver and transmitter (2) calculating the phase difference using a trivial algorithm. We analyzed the influences that add phase errors to the system. We evaluated the system with measurements in a partially controlled environment and in a confined space. Using the algorithm MUSIC and the designed antenna array, we were able to achieve an estimate of the angle of arrival within 1° in a partially controlled environment. In the con- fined space, we obtained an incorrect angle estimate for some channels due to the effect of multipath signal propagation, which can be detected and filtered out in simple environments. The trivial algorithm combined with the BOOSTXL-AOA antenna array provides a rough estimate of the signal angle in a controlled envi- ronment. Due to the large scatter of angle estimates, it is necessary to calculate the average of several angle estimates. ocena kota nizkoenergijski Bluetooth polje anten fazna razlika MUSIC večpotno razširjanje vgrajeni sistemi RF stikalo šum angle of arrival Bluetooth Low Energy antenna array phase difference MUSIC multipath propagation embedded systems RF switch noise true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2022-08-30 14:30:00 2022-08-30 14:30:07 2022-09-15 04:17:51 0000-00-00 00:00:00 2022 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 61022 120818947 Simoncic_Ales_-_Ocena_kota_prihoda_signala_z_uporabo_tehnologije_Bluetooth_Low_Energy_in_poljem_.pdf Simoncic_Ales_-_Ocena_kota_prihoda_signala_z_uporabo_tehnologije_Bluetooth_Low_Energy_in_poljem_.pdf 1 A6F4A4A2993E691E751FEB87EAB3CE9E 0b4199f06dd80084e813266859dc8f263da49a7a35e6dce9eb4b06a6ff8c4ded 7437b08b-285f-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=159631 Fakulteta za elektrotehniko 0 0 0