{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:14:21Z","timestamp":1760242461576,"version":"build-2065373602"},"reference-count":21,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2017,7,25]],"date-time":"2017-07-25T00:00:00Z","timestamp":1500940800000},"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>Multichannel synthetic aperture radar (SAR) is a breakthrough given the inherent limitation between high-resolution and wide-swath (HRWS) faced with conventional SAR. This paper aims to obtain unambiguous imaging of static scenes and moving targets with the first Chinese dual-channel spaceborne SAR sensor. We propose an integrated imaging scheme with the dual-channel echoes. In the imaging scheme, the subspace-based error estimation algorithm is first applied to the spaceborne multichannel SAR system, followed by the reconstruction algorithm prior to imaging. The motion-adapted reconstruction algorithm for moving target imaging is initially achieved with the spaceborne multichannel SAR system. The results exhibit an effective suppression of azimuth ambiguities and false targets with the proposed process. This paper verifies the accuracy of the subspace-based channel error estimator and the feasibility of the motion-adapted reconstruction algorithm. The proposed imaging process has prospects for future HRWS SAR systems with more channels.<\/jats:p>","DOI":"10.3390\/s17081709","type":"journal-article","created":{"date-parts":[[2017,7,25]],"date-time":"2017-07-25T10:04:36Z","timestamp":1500977076000},"page":"1709","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Unambiguous Imaging of Static Scenes and Moving Targets with the First Chinese Dual-Channel Spaceborne SAR Sensor"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3712-1562","authenticated-orcid":false,"given":"Tingting","family":"Jin","sequence":"first","affiliation":[{"name":"Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"School of Electronic, Electrical and Communication Engineering, University of the Chinese Academy of Sciences, Beijing 100049, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8517-3415","authenticated-orcid":false,"given":"Xiaolan","family":"Qiu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Donghui","family":"Hu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chibiao","family":"Ding","sequence":"additional","affiliation":[{"name":"Key Laboratory of Technology in Geo-spatial Information Processing and Application Systems, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,7,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1049\/ip-f-2.1992.0016","article-title":"Wide-swath SAR","volume":"139","author":"Currie","year":"1992","journal-title":"Proc. Inst. Elect. Eng. F\u2014Radar Signal Process."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"564","DOI":"10.1109\/TAES.2009.5089542","article-title":"Digital beamforming on receive: Techniques and optimization strategies for high-resolution wideswath SAR imaging","volume":"45","author":"Gebert","year":"2009","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_3","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."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Okada, Y., Nakamura, S., Iribe, K., Yokota, Y., Tsuji, M., Tsuchida, M., Hariu, K., Kankaku, Y., Suzuki, S., and Osawa, Y. (2013, January 21\u201326). System design of wide swath, high resolution, full polarimetric L-band SAR onboard ALOS-2. Proceedings of the 2013 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Melbourne, Australia.","DOI":"10.1109\/IGARSS.2013.6723305"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"903","DOI":"10.1109\/LGRS.2012.2227107","article-title":"Phase mismatch calibration of the multichannel SAR based on azimuth cross correlation","volume":"10","author":"Feng","year":"2013","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"548","DOI":"10.1109\/LGRS.2012.2212873","article-title":"Channel Error Estimation Methods for Multichannel SAR Systems in Azimuth","volume":"10","author":"Yang","year":"2013","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1772","DOI":"10.1109\/LGRS.2016.2608386","article-title":"Estimation Accuracy and Cramer\u2013Rao Lower Bounds for Errors in Multichannel HRWS SAR Systems","volume":"13","author":"Jin","year":"2016","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1109\/LGRS.2004.832700","article-title":"Unambiguous SAR Signal Reconstruction from Nonuniform Displaced Phase Center Sampling","volume":"1","author":"Krieger","year":"2004","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1109\/TGRS.2012.2201947","article-title":"First Spaceborne Demonstration of Digital Beamforming for Azimuth Ambiguity Suppression","volume":"51","author":"Kim","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Tan, W., Xu, W., Huang, P., Huang, Z., Qi, Y., and Han, K. (2017). Investigation of Azimuth Multichannel Reconstruction for Moving Targets in High Resolution Wide Swath SAR. Sensors, 17.","DOI":"10.3390\/s17061270"},{"key":"ref_11","unstructured":"Baumgartner, S.V., and Krieger, G. (2016, January 6\u20139). Experimental verification of high-resolution wide-swath moving target indication. Proceedings of the 11th European Conference on Synthetic Aperture Radar (EUSAR), Hamburg, Germany."},{"key":"ref_12","first-page":"246","article-title":"SAR Along-track Interferometry with Application to RADARSAT-2 Ground Moving Target Indication","volume":"4885","author":"Shen","year":"2003","journal-title":"Proc. SPIE-Int. Soc. Opt. Eng."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Suchandt, S., Runge, H., and Steinbrecher, U. (2010, January 25\u201330). Ship detection and measurement using the TerraSAR-X dual-receive antenna mode. Proceedings of the 2010 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Honolulu, HI, USA.","DOI":"10.1109\/IGARSS.2010.5653762"},{"key":"ref_14","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":"Delphine","year":"2013","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Xu, J., Huang, Z., Yan, L., Zhou, X., Zhang, F., and Long, T. (2016). SAR Ground Moving Target Indication Based on Relative Residue of DPCA Processing. Sensors, 16.","DOI":"10.3390\/s16101676"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2766","DOI":"10.3390\/s120302766","article-title":"The Performance Analysis Based on SAR Sample Covariance Matrix","volume":"12","author":"Erten","year":"2012","journal-title":"Sensors"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1049\/iet-rsn.2013.0040","article-title":"Ground Moving Target Indication for High-Resolution Wide-Swath Synthetic Aperture Radar Systems","volume":"8","author":"Yang","year":"2014","journal-title":"IET Radar Sonar Navig."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"687","DOI":"10.1109\/TGRS.2014.2327031","article-title":"Robust Clutter Suppression and Moving Target Imaging Approach for Multichannel in Azimuth High-Resolution and Wide-Swath Synthetic Aperture Radar","volume":"53","author":"Zhang","year":"2015","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","unstructured":"Yang, T., Wang, Y., and Li, W. A Moving Target Imaging Algorithm for HRWS SAR\/GMTI Systems. IEEE Trans. Aerosp. Electron. Syst., in press."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Jin, T., Qiu, X., Hu, D., and Ding, C. (2017). An ML-Based Radial Velocity Estimation Algorithm for Moving Targets in Spaceborne High-Resolution and Wide-Swath SAR Systems. Remote Sens., 9.","DOI":"10.3390\/rs9050404"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"88","DOI":"10.4236\/jcc.2016.43014","article-title":"Channel error estimation methods comparison under different conditions for multichannel HRWS SAR systems","volume":"4","author":"Jin","year":"2016","journal-title":"J. Comput. 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