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Nevertheless, this approach faces robustness issues when GNSS signals become unavailable or sensors malfunction. Clearly, the robustness of the system increases considerably when multiple UAV agents are employed to perform collaborative positioning. In this work, an online distributed solution is proposed for relative localization, which incorporates multiple UAVs together with Signals of Opportunity (SOPs) as well as inertial, visual, and optical flow measurements. The proposed localization system includes relative self-localization of each UAV agent, as well as a reliable distributed relative positioning system (DRPS) for each UAV based on the relative positions from other UAV agents in its vicinity. The latter positioning strategy is required in case the relative self-localization fails, mainly due to such problems as inertial measurement unit (IMU) accumulated error drift, camera sensor errors, or SOP shortfalls due to multipath or antenna obstruction. Extensive field experiments validate the proposed technique and demonstrate increased localization accuracy and robustness when compared to the benchmark approach that does not include cooperation between UAVs.<\/jats:p>","DOI":"10.1007\/s10846-023-01992-2","type":"journal-article","created":{"date-parts":[[2023,12,2]],"date-time":"2023-12-02T03:01:46Z","timestamp":1701486106000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Online Distributed Relative Positioning Utilizing Multiple Cooperative Autonomous Agents"],"prefix":"10.1007","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8659-1865","authenticated-orcid":false,"given":"Nicolas","family":"Souli","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Panayiotis","family":"Kolios","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3319-7677","authenticated-orcid":false,"given":"Georgios","family":"Ellinas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,12,2]]},"reference":[{"key":"1992_CR1","doi-asserted-by":"publisher","first-page":"2723","DOI":"10.1109\/TITS.2019.2907851","volume":"21","author":"M Maaref","year":"2019","unstructured":"Maaref, M., Kassas, Z.M.: Ground vehicle navigation in GNSS-challenged environments using signals of opportunity and a closed-loop map-matching approach. 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