{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T03:43:28Z","timestamp":1761709408724,"version":"build-2065373602"},"reference-count":36,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2017,11,21]],"date-time":"2017-11-21T00:00:00Z","timestamp":1511222400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In spaceborne synthetic aperture radar (SAR) sensors, it is a challenging task to detect ground slow-moving targets against strong clutter background with limited spatial channels and restricted pulse repetition frequency (PRF). In this paper, we evaluate the image-based dual-channel SAR-ground moving target indication (SAR-GMTI) workflow for the Gaofen-3 SAR sensor and analyze the impact of strong azimuth ambiguities on GMTI when the displaced phase center antenna (DPCA) condition is not fully satisfied, which has not been demonstrated yet. An effective sliding window design technique based on system parameters analysis is proposed to deal with azimuth ambiguities and reduce false alarm. In the SAR-GMTI experiments, co-registration, clutter suppression, constant false alarm rate (CFAR) detector, vector velocity estimation and moving target relocation are analyzed and discussed thoroughly. With the real measured data of the Gaofen-3 dual-channel SAR sensor, the GMTI capability of this sensor is demonstrated and the effectiveness of the proposed method is verified.<\/jats:p>","DOI":"10.3390\/s17112683","type":"journal-article","created":{"date-parts":[[2017,11,21]],"date-time":"2017-11-21T11:23:20Z","timestamp":1511263400000},"page":"2683","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["First Spaceborne SAR-GMTI Experimental Results for the Chinese Gaofen-3 Dual-Channel SAR Sensor"],"prefix":"10.3390","volume":"17","author":[{"given":"Chenghao","family":"Wang","sequence":"first","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Shaanxi 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guisheng","family":"Liao","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Radar Signal Processing, Xidian University, Shaanxi 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qingjun","family":"Zhang","sequence":"additional","affiliation":[{"name":"Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,11,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"807","DOI":"10.1109\/TGRS.2009.2037919","article-title":"Automatic extraction of traffic flows using TerraSAR-X along-track interferometry","volume":"48","author":"Suchandt","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1049\/ip-rsn:20000773","article-title":"Estimating ocean surface velocity and coherence time using multichannel ATI-SAR systems","volume":"147","author":"Besson","year":"2000","journal-title":"IEE Proc.-Radar Sonar Navig."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5052","DOI":"10.1109\/JSTARS.2015.2438898","article-title":"Multichannel SAR-GMTI in Maritime Scenarios With F-SAR and TerraSAR-X Sensors","volume":"8","author":"Makhoul","year":"2015","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2496","DOI":"10.1109\/TGRS.2014.2360989","article-title":"A performance evaluation of SAR-GMTI missions for maritime applications","volume":"53","author":"Makhoul","year":"2015","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_5","unstructured":"Adamiuk, G., Heer, C., and Ludwig, M. (2016, January 6\u20139). DBF Technology Development for Next Generation of ESA C-Band SAR mission. Proceedings of the 11th European Conference on Synthetic Aperture Radar (EUSAR), Hamburg, Germany."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"4626","DOI":"10.1109\/TGRS.2012.2193133","article-title":"Fast GMTI algorithm for traffic monitoring based on a priori knowledge","volume":"50","author":"Baumgartner","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Krieger, G., Gebert, N., Younis, M., and Moreira, A. (2008, January 26\u201330). Advanced synthetic aperture radar based on digital beamforming and waveform diversity. Proceedings of the Radar Conference, RADAR\u203208, Rome, Italy.","DOI":"10.1109\/RADAR.2008.4720875"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1325","DOI":"10.1109\/TGRS.2016.2622712","article-title":"Image-Based Target Detection and Radial Velocity Estimation Methods for Multichannel SAR-GMTI","volume":"55","author":"Suwa","year":"2017","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1109\/MAES.2004.1263229","article-title":"A stap overview","volume":"19","author":"Melvin","year":"2004","journal-title":"IEEE Aerosp. Electron. Syst. Mag."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1049\/ecej:19990106","article-title":"Space-time processing for multichannel synthetic aperture radar","volume":"11","author":"Ender","year":"1999","journal-title":"Electron. Commun. Eng. J."},{"key":"ref_11","unstructured":"Klemm, R. (2002). Principles of Space-Time Adaptive Processing, IEE Publishers."},{"key":"ref_12","unstructured":"Cerutti-Maori, D., and Sikaneta, I. (2010, January 7\u201310). Optimum GMTI processing for space-based SAR\/GMTI systems-theoretical derivation. Proceedings of the EUSAR 2010: 8th European Conference on Synthetic Aperture Radar, Aachen, Germany."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3868","DOI":"10.1109\/TGRS.2012.2186637","article-title":"Optimum SAR\/GMTI processing and its application to the radar satellite RADARSAT-2 for traffic monitoring","volume":"50","author":"Sikaneta","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_14","unstructured":"DiPietro, R.C. (1992, January 26\u201328). Extended factored space-time processing for airborne radar systems. Proceedings of the 1992 Conference Record of the Twenty-Sixth Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"691","DOI":"10.1109\/TGRS.2003.821886","article-title":"Statistical analysis of multilook SAR interferograms for CFAR detection of ground moving targets","volume":"42","author":"Gierull","year":"2004","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"436","DOI":"10.1109\/TGRS.2012.2201729","article-title":"Two-step detector for RADARSAT-2\u2019s experimental GMTI mode","volume":"51","author":"Gierull","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_17","unstructured":"Lightstone, L., Faubert, D., and Rempel, G. (1991, January 12\u201313). Multiple phase centre DPCA for airborne radar. Proceedings of the 1991 IEEE National Radar Conference, New York, NY, USA."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"560","DOI":"10.1109\/TGRS.2012.2201260","article-title":"A Generalization of DPCA Processing for Multichannel SAR\/GMTI Radars","volume":"51","author":"Sikaneta","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"3527","DOI":"10.1109\/TGRS.2012.2184798","article-title":"Detection and estimation with RADARSAT-2 moving-object detection experiment modes","volume":"50","author":"Dragosevic","year":"2012","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1109\/83.736707","article-title":"Signal subspace fusion of uncalibrated sensors with application in SAR and diagnostic medicine","volume":"8","author":"Soumekh","year":"1999","journal-title":"IEEE Trans. Image Process."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"288","DOI":"10.1109\/TGRS.2005.860984","article-title":"Image auto-coregistration and InSAR interferogram estimation using joint subspace projection","volume":"44","author":"Li","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2035","DOI":"10.1109\/TAES.2010.5595612","article-title":"Multi-channel SAR-GMTI method robust to coregistration error of SAR images","volume":"46","author":"Suo","year":"2010","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Liu, X., Meng, J., Lin, H., Li, X., and Zhao, H. (2014, January 19\u201323). A comparison to joint pixel vector methods for clutter suppression in SAR-GMTI system. Proceedings of the 12th International Conference on Signal Processing (ICSP), Hangzhou, China.","DOI":"10.1109\/ICOSP.2014.7015352"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"621","DOI":"10.1109\/7.845251","article-title":"Space-time adaptive radar performance in heterogeneous clutter","volume":"36","author":"Melvin","year":"2000","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_25","unstructured":"Gierull, C.H. (2003). Digital Channel Balancing of Along-Track Interferometric SAR Data."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1049\/iet-rsn.2013.0032","article-title":"Channel balancing algorithm in multichannel wide-area surveillance systems","volume":"8","author":"Yan","year":"2014","journal-title":"IET Radar Sonar Navig."},{"key":"ref_27","unstructured":"Bertetich, A. (2010). Investigation of Multi-Channel SAR Calibration Methods for Real-Time Traffic Monitoring. [Master\u2019s Thesis, University of Trento]."},{"key":"ref_28","unstructured":"Cerutti-Maori, D., Sikaneta, I., and Gierull, C.H. (2017). Comparison of the GMTI Capability of RADARSAT-2 MODEX-1 and MODEX-2 Modes\u2014Optimum Signal Processing and Theoretical Investigation of the GMTI Performance."},{"key":"ref_29","first-page":"269","article-title":"System design and key technologies of the GF-3 satellite","volume":"46","author":"Zhang","year":"2017","journal-title":"Acta Geod. Cartogr. Sin."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Sun, J., Yu, W., and Deng, Y. (2017). The SAR payload design and performance for the GF-3 mission. Sensors, 17.","DOI":"10.3390\/s17102419"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Wang, T., Zhang, G., Yu, L., Zhao, R., Deng, M., and Xu, K. (2017). Multi-mode GF-3 satellite image geometric accuracy verification using the RPC model. Sensors, 17.","DOI":"10.3390\/s17092005"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Zhao, R., Zhang, G., Deng, M., Xu, K., and Guo, F. (2017). Geometric calibration and accuracy verification of the GF-3 satellite. Sensors, 19.","DOI":"10.3390\/s17091977"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Jin, T., Qiu, X., Hu, D., and Ding, C. (2017). Unambiguous Imaging of Static Scenes and Moving Targets with the First Chinese Dual-Channel Spaceborne SAR Sensor. Sensors, 17.","DOI":"10.3390\/s17081709"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1109\/TGRS.2005.859343","article-title":"The influence of target acceleration on velocity estimation in dual-channel SAR-GMTI","volume":"44","author":"Sharma","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"208","DOI":"10.1109\/7.135446","article-title":"A CFAR adaptive matched filter detector","volume":"28","author":"Robey","year":"1992","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"795","DOI":"10.1109\/TGRS.2009.2032920","article-title":"Fore and AFT channel reconstruction in the TerraSAR-X dual receive antenna mode","volume":"48","author":"Gabele","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/11\/2683\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:50:35Z","timestamp":1760208635000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/11\/2683"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,11,21]]},"references-count":36,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2017,11]]}},"alternative-id":["s17112683"],"URL":"https:\/\/doi.org\/10.3390\/s17112683","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2017,11,21]]}}}