{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T14:24:13Z","timestamp":1777472653960,"version":"3.51.4"},"reference-count":35,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2022,4,19]],"date-time":"2022-04-19T00:00:00Z","timestamp":1650326400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Scientific Grant Agency (VEGA)","award":["No. 1\/0584\/20"],"award-info":[{"award-number":["No. 1\/0584\/20"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>UAVs, used for professional purposes, often intervene in unfamiliar terrain and challenging conditions. Unlike recreational UAVs, such professional and specialised UAVs are very expensive to develop and operate, and their value is not negligible. Due to the nature of operations in an unknown or dangerous environment, there are also situations with forced interruption and termination of the flight mission or a collision with the environment. Locating a lost vehicle presents a new challenge for UAV operators. The possibilities of today\u2019s localised commercial aircraft in distress (COSPASS\/SARSAT systems) are undesirable for selective special-purpose drones. The optimisation of the location in the event of an emergency or catastrophic landing may be justified by a social or other condition, where the user wants to search for the device by a system other than the one experienced for rescuing people, ideally on their reserved frequencies. The article proposes a new approach to solving the problem based on the design of a terrestrial localisation system based on the methods of processing and correlation of the obtained data by the physical principle of the Doppler effect and its own system adaptation. This creates an innovative concept of a targeting system based on the broadcasting of distress (VHF) signal by crashed UAV. This signal is captured and evaluated by the IDVOR system, making it possible to determine the direction in which the searched UAV is placed. In order to determine the difference between standard targeting systems of the UAV, which use information about position (exact coordinates (x,y,z)), the IDVOR system is able to determine direction, independent of other systems in every \u201cenemy\u201d or \u201cinhospitable\u201d territory.<\/jats:p>","DOI":"10.3390\/s22093122","type":"journal-article","created":{"date-parts":[[2022,4,20]],"date-time":"2022-04-20T00:22:43Z","timestamp":1650414163000},"page":"3122","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["A Reasonable Alternative System for Searching UAVs in the Local Area"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8369-034X","authenticated-orcid":false,"given":"Marek","family":"\u010ce\u0161kovi\u010d","sequence":"first","affiliation":[{"name":"Faculty of Aeronautics, Technical University of Ko\u0161ice, Rampov\u00e1 7, 041 21 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5971-6367","authenticated-orcid":false,"given":"Pavol","family":"Kurdel","sequence":"additional","affiliation":[{"name":"Faculty of Aeronautics, Technical University of Ko\u0161ice, Rampov\u00e1 7, 041 21 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8533-2458","authenticated-orcid":false,"given":"Nat\u00e1lia","family":"Gecejov\u00e1","sequence":"additional","affiliation":[{"name":"Faculty of Aeronautics, Technical University of Ko\u0161ice, Rampov\u00e1 7, 041 21 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9466-5673","authenticated-orcid":false,"given":"J\u00e1n","family":"Labun","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Informatics, Technical University of Ko\u0161ice, Letn\u00e1 9, 042 00 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2562-5544","authenticated-orcid":false,"given":"M\u00e1ria","family":"Gamcov\u00e1","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Informatics, Technical University of Ko\u0161ice, Letn\u00e1 9, 042 00 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mat\u00fa\u0161","family":"Lehock\u00fd","sequence":"additional","affiliation":[{"name":"Slovak Air Force 46th Transport Wing, 901 01 Malacky, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,4,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Liu, H., Ge, J., Wang, Y., Li, J., Ding, K., Zhang, Z., Guo, Z., Li, W., and Lan, J. 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