{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T20:44:43Z","timestamp":1778705083724,"version":"3.51.4"},"reference-count":58,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2022,7,6]],"date-time":"2022-07-06T00:00:00Z","timestamp":1657065600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Radar imaging from unmanned aerial vehicles (UAVs) is a dynamic research topic attracting huge interest due to its practical fallouts. In this context, this article provides a comprehensive review of the current state of the art and challenges related to UAV-based ground-penetrating radar (GPR) imaging systems. First, a description of the available prototypes is provided in terms of radar technology, UAV platforms, and navigation control devices. Afterward, the paper addresses the main issues affecting the performance of UAV-based GPR imaging systems. such as the control of the UAV platform during the flight to collect high-quality data, the necessity to provide accurate platform position information in terms of probing wavelength, and the mitigation of clutter and other electromagnetic disturbances. A description of the major applicative areas for UAV GPR systems is reported with the aim to show their potential. Furthermore, the main signal-processing approaches currently adopted are detailed and two experimental tests are also reported to prove the actual imaging capabilities. Finally, open challenges and future perspectives regarding this promising technology are discussed.<\/jats:p>","DOI":"10.3390\/rs14143245","type":"journal-article","created":{"date-parts":[[2022,7,6]],"date-time":"2022-07-06T21:15:52Z","timestamp":1657142152000},"page":"3245","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":59,"title":["An Overview on Down-Looking UAV-Based GPR Systems"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5926-6757","authenticated-orcid":false,"given":"Carlo","family":"Noviello","sequence":"first","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gianluca","family":"Gennarelli","sequence":"additional","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8806-2895","authenticated-orcid":false,"given":"Giuseppe","family":"Esposito","sequence":"additional","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"},{"name":"Department of Industrial Engineering (DII), University of Naples \u201cFederico II\u201d, Via Claudio 21, 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5672-2721","authenticated-orcid":false,"given":"Giovanni","family":"Ludeno","sequence":"additional","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2205-3077","authenticated-orcid":false,"given":"Giancarmine","family":"Fasano","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering (DII), University of Naples \u201cFederico II\u201d, Via Claudio 21, 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8594-9455","authenticated-orcid":false,"given":"Luigi","family":"Capozzoli","sequence":"additional","affiliation":[{"name":"Institute of Methodologies for Environmental Analysis, National Research Council, C.da S. Loja-Zona Industriale, 85050 Potenza, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0377-3127","authenticated-orcid":false,"given":"Francesco","family":"Soldovieri","sequence":"additional","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9031-9992","authenticated-orcid":false,"given":"Ilaria","family":"Catapano","sequence":"additional","affiliation":[{"name":"Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"460","DOI":"10.1038\/nature14542","article-title":"Science, technology and the future of small autonomous drones","volume":"521","author":"Floreano","year":"2015","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Daniels, D.J. (2004). Ground Penetrating Radar, IET.","DOI":"10.1049\/PBRA015E"},{"key":"ref_3","unstructured":"Weib, M., and Ender, J.H.G. (2005, January 3\u20134). A 3D Imaging Radar for Small Unmanned Airplanes-ARTINO. Proceedings of the European Radar Conference, Paris, France."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Li, C.J., and Ling, H. (July, January 26). High-resolution, downward-looking radar imaging using a small consumer drone. In Proceedings of the 2016 IEEE International Symposium on Antennas and Propagation (APSURSI), Fajardo, PR, USA.","DOI":"10.1109\/APS.2016.7696725"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"791","DOI":"10.1080\/01691864.2017.1351393","article-title":"An integrated aerial system for landmine detection: SDR-based Ground Penetrating Radar onboard an autonomous drone","volume":"31","author":"Colorado","year":"2017","journal-title":"Adv. Robot."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Burr, R., Schartel, M., Schmidt, P., Mayer, W., Walter, T., and Waldschmidt, C. (2018, January 15\u201317). Design and Implementation of a FMCW GPR for UAV-based Mine Detection. Proceedings of the 2018 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), Munich, Germany.","DOI":"10.1109\/ICMIM.2018.8443526"},{"key":"ref_7","first-page":"4014505","article-title":"UAV-Borne FMCW InSAR for Focusing Buried Objects","volume":"19","author":"Burr","year":"2021","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1109\/TIM.2019.2893043","article-title":"Drone-mounted ultrawideband radar for retrieval of snowpack properties","volume":"69","author":"Jenssen","year":"2019","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"45100","DOI":"10.1109\/ACCESS.2018.2863572","article-title":"Synthetic aperture radar imaging system for landmine detection using a ground penetrating radar on board a unmanned aerial vehicle","volume":"6","author":"Arboleya","year":"2018","journal-title":"IEEE Access"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Garcia-Fernandez, M., Alvarez-Lopez, Y., and Las Heras, F. (2019). Autonomous Airborne 3D SAR Imaging System for Subsurface Sensing: UWB-GPR on Board a UAV for Landmine and IED Detection. Remote Sens., 11.","DOI":"10.3390\/rs11202357"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1016\/j.rse.2018.04.040","article-title":"Assessment of a micro-UAV system for microwave tomography radar imaging","volume":"212","author":"Ludeno","year":"2018","journal-title":"Remote Sens. Environ."},{"key":"ref_12","first-page":"3507105","article-title":"Multilines Imaging Approach for Mini-UAV Radar Imaging System","volume":"19","author":"Noviello","year":"2021","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Noviello, C., Esposito, G., Fasano, G., Renga, A., Soldovieri, F., and Catapano, I. (2020). Small-UAV Radar Imaging System Performance with GPS and CDGPS Based Motion Compensation. Remote Sens., 12.","DOI":"10.3390\/rs12203463"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Catapano, I., Gennarelli, G., Ludeno, G., Noviello, C., Esposito, G., Renga, A., Fasano, G., and Soldovieri, F. (2020). Small Multicopter-UAV-Based Radar Imaging: Performance Assessment for a Single Flight Track. Remote Sens., 12.","DOI":"10.3390\/rs12050774"},{"key":"ref_15","unstructured":"Schreiber, E., Heinzel, A., Peichl, M., Engel, M., and Wiesbeck, W. (April, January 31). Advanced buried object detection by multichannel, UAV\/drone carried synthetic aperture radar. Proceedings of the 2019 13th IEEE European Conference on Antennas and Propagation (EuCAP), Krakow, Poland."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"111456","DOI":"10.1016\/j.rse.2019.111456","article-title":"A new drone-borne GPR for soil moisture mapping","volume":"235","author":"Wu","year":"2019","journal-title":"Remote Sens. Environ."},{"key":"ref_17","first-page":"22","article-title":"A lightweight and low-power UAV-borne ground penetrating radar design for landmine detection","volume":"20","author":"Gleich","year":"2020","journal-title":"Sensors"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Saponaro, A., Dipierro, G., Cannella, E., Panarese, A., Galiano, A.M., and Massaro, A. (2021). A UAV-GPR Fusion Approach for the Characterization of a Quarry Excavation Area in Falconara Albanese, Southern Italy. Drones, 5.","DOI":"10.3390\/drones5020040"},{"key":"ref_19","unstructured":"Francke, J., and Dobrovolskiy, A. (October, January 26). Challenges and opportunities with drone-mounted GPR. Proceedings of the First International Meeting for Applied Geoscience & Energy, Denver, CO, USA."},{"key":"ref_20","unstructured":"(2022, June 09). Cobra Plug in GPR Web Site. Available online: http:\/\/www.radarteam.se\/index.html."},{"key":"ref_21","unstructured":"(2022, June 09). Cobra Wireless GPR Web Site. Available online: http:\/\/www.radarteam.se\/cobra-wireless-gpr.html."},{"key":"ref_22","unstructured":"(2022, June 09). Zond-12e GPR Web Site. Available online: http:\/\/www.radsys.lv\/en\/products-soft\/products\/prod\/7."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Vergnano, A., Franco, D., and Godio, A. (2022). Drone-Borne Ground-Penetrating Radar for Snow Cover Mapping. Remote Sens., 14.","DOI":"10.3390\/rs14071763"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3126","DOI":"10.1109\/TIM.2019.2930159","article-title":"Improvement of GPR SAR-based techniques for accurate detection and imaging of buried objects","volume":"69","year":"2020","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Garc\u00eda-Fern\u00e1ndez, M., \u00c1lvarez L\u00f3pez, Y., De Mitri, A., Castrillo Mart\u00ednez, D., \u00c1lvarez-Narciandi, G., and Las-Heras Andr\u00e9s, F. (2020). Portable and Easily-Deployable Air-Launched GPR Scanner. Remote Sens., 12.","DOI":"10.3390\/rs12111833"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Schreiber, E., Peichl, M., Dill, S., and Bischeltsrieder, F. (2016). Detection of landmines and UXO using advanced synthetic aperture radar technology. Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XXI, SPIE.","DOI":"10.1117\/12.2225067"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Lopez, Y.A., Garcia-Fernandez, M., Alvarez-Narciandi, G., and Andres, F.L.H. (2022). Unmanned Aerial Vehicle-Based Ground-Penetrating Radar Systems: A Review. IEEE Geosci. Remote Sens. Mag., 2\u201322.","DOI":"10.1109\/MGRS.2022.3160664"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"917","DOI":"10.1109\/TCI.2017.2669865","article-title":"Reconstruction capabilities of down-looking airborne GPRs: The single frequency case","volume":"3","author":"Gennarelli","year":"2017","journal-title":"IEEE Trans. Comput. Imaging"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1342","DOI":"10.1190\/1.1440899","article-title":"Wave equation migration with the phase-shift method","volume":"43","author":"Gazdag","year":"1978","journal-title":"Geophysics"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1190\/1.1440826","article-title":"Migration by Fourier transform","volume":"43","author":"Stolt","year":"1978","journal-title":"Geophysics"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1109\/MGRS.2021.3082170","article-title":"Contactless ground penetrating radar imaging: State of the art, challenges, and microwave tomography-based data processing","volume":"10","author":"Catapano","year":"2021","journal-title":"IEEE Geosci. Remote Sens. Mag."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Xingbang, Y., and Pei, X. (2022). Hybrid system for powering unmanned aerial vehicles: Demonstration and study cases. Hybrid Technologies for Power Generation, Academic Press.","DOI":"10.1016\/B978-0-12-823793-9.00014-0"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"620","DOI":"10.1109\/TGRS.1990.572967","article-title":"A new method of aircraft motion error extraction from radar raw data for real time motion compensation","volume":"28","author":"Moreira","year":"1990","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_34","unstructured":"Kaplan, E.D., and Hegarty, C. (2017). Understanding GPS\/GNSS: Principles and Applications, Artech House."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Harkegard, O. (2001). Flight Control Design Using Backstepping. [Ph.D. Dissertation, Department of Electrical Engineering, Linkopings Universitet].","DOI":"10.1016\/S1474-6670(17)35187-X"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Persico, R. (2014). Introduction to Ground Penetrating Radar: Inverse Scattering and Data Processing, John Wiley & Sons.","DOI":"10.1002\/9781118835647"},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Catapano, I., Gennarelli, G., Ludeno, G., Soldovieri, F., and Persico, R. (2019). Ground-Penetrating Radar: Operation Principle and Data Processing. Wiley Encycl. Electr. Electron. Eng., 1\u201323.","DOI":"10.1002\/047134608X.W8383"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1104","DOI":"10.1109\/TGRS.2007.910223","article-title":"Effects of background removal in linear inverse scattering","volume":"4","author":"Persico","year":"2008","journal-title":"IEEE Trans. Geosci. Rem. Sens."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"792798","DOI":"10.1109\/JSTARS.2013.2287016","article-title":"Ground clutter removal in gpr surveys","volume":"7","author":"Solimene","year":"2014","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Garcia-Fernandez, M., Alvarez-Lopez, Y., Arboleya-Arboleya, A., Las-Heras, F., Rodriguez-Vaqueiro, Y., Gonzalez-Valdes, B., and Pino-Garcia, A. (2017, January 9\u201314). SVD-based clutter removal technique for GPR. Proceedings of the 2017 IEEE International Symposium on Antennas and Propagation & USNC\/URSI National Radio Science Meeting, San Diego, CA, USA.","DOI":"10.1109\/APUSNCURSINRSM.2017.8073227"},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Klare, J., Cerutti-Maori, D., Brenner, A., and Ender, J. (2007, January 23\u201328). Image quality analysis of the vibrating sparse MIMO antenna array of the airborne 3D imaging radar ARTINO. Proceedings of the 2007 IEEE International Geoscience and Remote Sensing Symposium, Barcelona, Spain.","DOI":"10.1109\/IGARSS.2007.4424061"},{"key":"ref_42","unstructured":"Weiss, M., and Gilles, M. (2010, January 7\u201310). Initial ARTINO radar experiments. Proceedings of the 8th European Conference on Synthetic Aperture Radar, Aachen, Germany."},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Schartel, M., Burr, R., B\u00e4hnemann, R., Mayer, W., and Waldschmidt, C. (2020). An experimental study on airborne landmine detection using a circular synthetic aperture radar. arXiv.","DOI":"10.1109\/LGRS.2019.2917917"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"703","DOI":"10.1109\/36.917876","article-title":"Electromagnetic induction spectroscopy for clearing landmines","volume":"39","author":"Won","year":"2001","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_45","unstructured":"Chew, W.C. (1995). Waves and Fields in Inhomogeneous Media, IEEE Press."},{"key":"ref_46","unstructured":"Soumekh, M. (1999). Synthetic Aperture Radar Signal Processing, Wiley."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1190\/1.1440828","article-title":"Integral formulation for migration in two and three dimensions","volume":"43","author":"Schneider","year":"1978","journal-title":"Geophysics"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1109\/7.78293","article-title":"SAR data focusing using seismic migration techniques","volume":"27","author":"Cafforio","year":"1991","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_49","unstructured":"Richards, M.A. (2005). Fundamentals of Radar Signal Processing, Tata McGraw-Hill Education."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Bertero, M., and Boccacci, P. (1998). Introduction to Inverse Problems in Imaging, Institute of Physics Publishing.","DOI":"10.1887\/0750304359"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1109\/MSP.2014.2311271","article-title":"SAR imaging algorithms and some unconventional applications: A unified mathematical overview","volume":"31","author":"Solimene","year":"2014","journal-title":"IEEE Signal Processing Mag."},{"key":"ref_52","unstructured":"(2022, June 09). Available online: https:\/\/zoom.earth\/."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"7305","DOI":"10.1109\/TGRS.2020.2981884","article-title":"A comparison of linear inverse scattering models for contactless GPR imaging","volume":"58","author":"Ludeno","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"3541","DOI":"10.1109\/TAP.2006.882161","article-title":"A microwave tomography approach for a differential configuration in GPR prospecting","volume":"54","author":"Persico","year":"2006","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"1078","DOI":"10.1109\/JSTARS.2014.2363233","article-title":"Multipath ghosts in radar imaging: Physical insight and mitigation strategies","volume":"8","author":"Gennarelli","year":"2015","journal-title":"IEEE J. Sel. Topics Appl. Earth Observ. Remote Sens."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"1226","DOI":"10.1109\/LGRS.2016.2577715","article-title":"Comparative analysis of two approaches for multipath ghost suppression in radar imaging","volume":"13","author":"Gennarelli","year":"2016","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_57","doi-asserted-by":"crossref","unstructured":"Persico, R., Ludeno, G., Soldovieri, F., De Coster, A., and Lambot, S. (2017). Two-Dimensional Linear Inversion of GPR Data with a Shifting Zoom along the Observation Line. Remote Sens., 9.","DOI":"10.3390\/rs9100980"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"111409","DOI":"10.1016\/j.rse.2019.111409","article-title":"A low frequency airborne GPR System for Wide Area Geophysical Surveys: The Case Study of Morocco Desert","volume":"233","author":"Gennarelli","year":"2019","journal-title":"Remote Sens. Environ."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/14\/3245\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T23:43:19Z","timestamp":1760139799000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/14\/3245"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,7,6]]},"references-count":58,"journal-issue":{"issue":"14","published-online":{"date-parts":[[2022,7]]}},"alternative-id":["rs14143245"],"URL":"https:\/\/doi.org\/10.3390\/rs14143245","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,7,6]]}}}