{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T14:13:05Z","timestamp":1785420785387,"version":"3.56.0"},"reference-count":48,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T00:00:00Z","timestamp":1730332800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Commission via the Executive Agency for Small and Medium-sized Enterprises (EASMEs)","award":["H2020SMEPh2-830344"],"award-info":[{"award-number":["H2020SMEPh2-830344"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In recent years, drone-based Synthetic Aperture Radar (SAR) systems have emerged as flexible and cost-efficient solutions for detecting changes in the Earth\u2019s surface, retrieving topographic data, or detecting ground displacement processes in localized areas, among other applications. These systems offer a unique combination of short and versatile revisit times and flexible acquisition geometries that are not achievable with space-borne, airborne, or ground-based SAR sensors. However, due to platform limitations and flight stability issues, they also present significant challenges regarding instrument design and data processing, particularly when generating interferometric repeat-pass datasets. This paper demonstrates the feasibility of repeat-pass interferometry using a Ku-band drone-based SAR system. The system integrates a dual-channel Ku-band Frequency Modulated Continuous Wave (FMCW) radar with cross-track single-pass interferometric capabilities, mounted on a drone platform. The proposed repeat-pass interferometric processing chain leverages an accurate Digital Elevation Model (DEM), generated from the single-pass interferograms, to precisely coregister the entire stack of acquisitions, thereby producing repeat-pass interferograms free from residual motion errors. The results underscore the potential of this system and the processing chain proposed for generating multi-temporal repeat-pass stacks suitable for repeat-pass applications.<\/jats:p>","DOI":"10.3390\/rs16214069","type":"journal-article","created":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T09:57:36Z","timestamp":1730368656000},"page":"4069","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Ku-Band SAR-Drone System and Methodology for Repeat-Pass Interferometry"],"prefix":"10.3390","volume":"16","author":[{"given":"Gerard","family":"Ruiz-Carregal","sequence":"first","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"},{"name":"Teoria de Senyal i Comunicacions, Universitat Politecnica de Catalunya, 08034 Barcelona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Lort Cuenca","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis","family":"Yam","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerard","family":"Masalias","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0393-0302","authenticated-orcid":false,"given":"Eduard","family":"Makhoul","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5490-7773","authenticated-orcid":false,"given":"Rub\u00e9n","family":"Iglesias","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Heredia","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c1lex","family":"Gonz\u00e1lez","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuseppe","family":"Centolanza","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert","family":"Gili-Zaragoza","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Azadeh","family":"Faridi","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dani","family":"Monells","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Duro","sequence":"additional","affiliation":[{"name":"Dares Technology, C\/Esteve Terrades, 1, Edif. RDIT, Parc UPC, 08860 Castelldefels, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,10,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1109\/MGRS.2013.2248301","article-title":"A tutorial on synthetic aperture radar","volume":"1","author":"Moreira","year":"2013","journal-title":"IEEE Geosci. Remote Sens. 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