{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T08:53:15Z","timestamp":1767689595307,"version":"3.48.0"},"reference-count":145,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2026,1,4]],"date-time":"2026-01-04T00:00:00Z","timestamp":1767484800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Portuguese Foundation for Science and Technology","award":["2024.04457"],"award-info":[{"award-number":["2024.04457"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sustainability"],"abstract":"<jats:p>Within the field of the structural monitoring of bridges, numerous technologies and methodologies have been developed. Among these, methods based on synthetic aperture radar (SAR) which utilise satellite data from missions such as Sentinel-1 (European Space Agency-ESA) and COSMO-SkyMed (Agenzia Spaziale Italiana\u2014ASI) to capture displacements, temperature-related changes, and other geophysical measurements have gained increasing attention. However, SAR has yet to establish its value and potential fully; its broader adoption hinges on consistently demonstrating its robustness through recurrent applications, well-defined use cases, and effective strategies to address its inherent limitations. This study presents a systematic literature review (SLR) conducted in accordance with key stages of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 framework. An initial corpus of 1218 peer-reviewed articles was screened, and a final set of 25 studies was selected for in-depth analysis based on citation impact, keyword recurrence, and thematic relevance from the last five years. The review critically examines SAR-based techniques\u2014including Differential Interferometric SAR (DInSAR), multi-temporal InSAR (MT-InSAR), and Persistent Scatterer Interferometry (PSI), as well as approaches to integrating SAR data with ground-based measurements and complementary digital models. Emphasis is placed on real-world case studies and persistent technical challenges, such as atmospheric artefacts, Line-of-Sight (LOS) geometry constraints, phase noise, ambiguities in displacement interpretation, and the translation of radar-derived deformations into actionable structural insights. The findings underscore SAR\u2019s significant contribution to the structural health monitoring (SHM) of bridges, consistently delivering millimetre-level displacement accuracy and enabling engineering-relevant interpretations. While standalone SAR-based techniques offer wide-area monitoring capabilities, their full potential is realised only when integrated with complementary procedures such as thermal modelling, multi-sensor validation, and structural knowledge. Finally, this document highlights the persistent technical constraints of InSAR in bridge monitoring\u2014including measurement ambiguities, SAR image acquisition limitations, and a lack of standardised, automated workflows\u2014that continue to impede operational adoption but also point toward opportunities for methodological improvement.<\/jats:p>","DOI":"10.3390\/su18010514","type":"journal-article","created":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T13:35:47Z","timestamp":1767620147000},"page":"514","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Systematic Review of the Practical Applications of Synthetic Aperture Radar (SAR) for Bridge Structural Monitoring"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9915-4055","authenticated-orcid":false,"given":"Homer Armando","family":"Buelvas Moya","sequence":"first","affiliation":[{"name":"Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal"},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia (FCT), Av. D. Carlos I, No. 126, 1249-074 Lisboa, Portugal"}]},{"given":"Minh Q.","family":"Tran","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal"}]},{"given":"Sergio","family":"Pereira","sequence":"additional","affiliation":[{"name":"Infraestruturas de Portugal, Av. Dra. Elza Maria Pires Chambel 11, 2005-356 Santarem, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1536-2149","authenticated-orcid":false,"given":"Jos\u00e9 C.","family":"Matos","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3341-3034","authenticated-orcid":false,"given":"Son N.","family":"Dang","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Tran, M.Q., Sousa, H.S., Ngo, T.V., Nguyen, B.D., Nguyen, Q.T., Nguyen, H.X., Baron, E., Matos, J., and Dang, S.N. (2023). 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