{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:23:34Z","timestamp":1760145814697,"version":"build-2065373602"},"reference-count":21,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2024,8,29]],"date-time":"2024-08-29T00:00:00Z","timestamp":1724889600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["62101603","62201623","62502010220","2023B1212060024"],"award-info":[{"award-number":["62101603","62201623","62502010220","2023B1212060024"]}]},{"name":"the Insight Action","award":["62101603","62201623","62502010220","2023B1212060024"],"award-info":[{"award-number":["62101603","62201623","62502010220","2023B1212060024"]}]},{"name":"the Science and Technology Planning Project of Key Laboratory of Advanced IntelliSense Technology Guangdong Science and Technology Department","award":["62101603","62201623","62502010220","2023B1212060024"],"award-info":[{"award-number":["62101603","62201623","62502010220","2023B1212060024"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Airborne Frequency Diversity Array (FDA) radar operating at a high pulse repetition frequency encounters severe range-ambiguous clutter. The slight frequency increments introduced by the FDA result in angle and range coupling. Under these conditions, conventional space-time adaptive processing (STAP) often exhibits diminished performance or fails, complicating target detection. This paper proposes a method combining elevation oblique subspace projection with azimuth-Doppler STAP to suppress range-ambiguous clutter. The method compensates for the quadratic range dependence by analyzing the relationship between elevation frequency and range. It uses an elevation oblique subspace projection technique to construct an elevation adaptive filter, which separates clutter from ambiguous regions. Finally, residual clutter suppression is achieved through azimuth-Doppler STAP, enhancing target detection performance. Simulation results demonstrate that the proposed method effectively addresses range dependence and ambiguity issues, improving target detection performance in complex airborne FDA radar environments.<\/jats:p>","DOI":"10.3390\/rs16173198","type":"journal-article","created":{"date-parts":[[2024,8,29]],"date-time":"2024-08-29T11:12:13Z","timestamp":1724929933000},"page":"3198","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cascade Clutter Suppression Method for Airborne Frequency Diversity Array Radar Based on Elevation Oblique Subspace Projection and Azimuth-Doppler Space-Time Adaptive Processing"],"prefix":"10.3390","volume":"16","author":[{"given":"Rongwei","family":"Lu","sequence":"first","affiliation":[{"name":"School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China"}]},{"given":"Yifeng","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China"}]},{"given":"Lei","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China"}]},{"given":"Ziyi","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Li, Y., Huo, T., Yang, C., Wang, T., Wang, J., and Li, B. (2022). An efficient ground moving target imaging method for airborne circular stripmap sar. Remote Sens., 14.","DOI":"10.3390\/rs14010210"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Han, J., Cao, Y., Wu, W., Wang, Y., Yeo, T.S., Liu, S., and Wang, F. (2021). Robust gmti scheme for highly squinted hypersonic vehicle-borne multichannel sar in dive mode. Remote Sens., 13.","DOI":"10.3390\/rs13214431"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Li, H., Liao, G., Xu, J., and Lan, L. (2022). An efficient maritime target joint detection and imaging method with airborne isar system. Remote Sens., 14.","DOI":"10.3390\/rs14010193"},{"key":"ref_4","unstructured":"Guerci, J. (2014). Space-Time Adaptive Processing for Radar, Artech. [2nd ed.]."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"6954","DOI":"10.1109\/TAES.2023.3281305","article-title":"Range-Ambiguous Sea Clutter Suppression for Multi-channel Spaceborne Radar Applications Via Alternating APC Processing","volume":"59","author":"Huang","year":"2023","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_6","first-page":"1","article-title":"A Novel Dimension-Reduced Space\u2013Time Adaptive Processing Algorithm for Spaceborne Multichannel Surveillance Radar Systems Based on Spatial\u2013Temporal 2-D Sliding Window","volume":"60","author":"Huang","year":"2022","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"8349","DOI":"10.1109\/TGRS.2020.3039495","article-title":"Multichannel Sea Clutter Modeling for Spaceborne Early Warning Radar and Clutter Suppression Performance Analysis","volume":"59","author":"Huang","year":"2021","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_8","first-page":"1","article-title":"Moving target detection using fda-mimo radar with planar array","volume":"21","author":"Miao","year":"2024","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_9","first-page":"1","article-title":"Beam-space reduced-dimension 3d-stap for nonside-looking airborne radar","volume":"19","author":"Cui","year":"2021","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_10","first-page":"1","article-title":"Short-range clutter suppression for airborne radar using sparse recovery and orthogonal projection","volume":"19","author":"Chen","year":"2022","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Wang, X., Ruan, Y., and Zhang, X. (2023). Effective non-stationary clutter suppression method via elevation oblique subspace projection for moving targets detection with a space-based surveillance radar. Electronics, 12.","DOI":"10.3390\/electronics12143110"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"268","DOI":"10.1109\/LGRS.2008.2012126","article-title":"Short-range clutter suppression for airborne radar by utilizing prefiltering in elevation","volume":"6","author":"Meng","year":"2009","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"900","DOI":"10.1049\/iet-rsn.2011.0359","article-title":"Efficient adaptive approach for airborne radar short-range clutter suppression","volume":"6","author":"Shen","year":"2012","journal-title":"IET Radar Sonar Navig."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1049\/iet-rsn.2019.0041","article-title":"Clutter suppression algorithm for non-side looking airborne radar with high pulse repetition frequency based on elevation\u2013compensation\u2013prefiltering","volume":"14","author":"Shen","year":"2020","journal-title":"IET Radar Sonar Navig."},{"key":"ref_15","unstructured":"Antonik, P., Wicks, M.C., Griffiths, H.D., and Baker, C.J. (2006, January 24\u201327). Multi-mission multi-mode waveform diversity. Proceedings of the 2006 IEEE Conference on Radar, Verona, NY, USA."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1620","DOI":"10.1109\/JSTSP.2015.2465353","article-title":"Range ambiguous clutter suppression for airborne fda-stap radar","volume":"9","author":"Xu","year":"2015","journal-title":"IEEE J. Sel. Top. Signal Process."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"5352","DOI":"10.1109\/TGRS.2016.2561308","article-title":"Space-time adaptive processing with vertical frequency diverse array for range-ambiguous clutter suppression","volume":"54","author":"Xu","year":"2016","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_18","first-page":"1","article-title":"Range-ambiguous clutter suppression for space-based early warning radar using vertical fda and horizontal epc","volume":"20","author":"Qiu","year":"2023","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_19","first-page":"5106517","article-title":"Range-ambiguous clutter suppression for stap-based radar with vertical coherent frequency diverse array","volume":"61","author":"Liu","year":"2023","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Ward, J. (1998, January 6). Space-time adaptive processing for airborne radar. Proceedings of the IEE Colloquium on Space-Time Adaptive Processing (Ref. No. 1998\/241), London, UK.","DOI":"10.1049\/ic:19980244"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1413","DOI":"10.1109\/78.286957","article-title":"Signal processing applications of oblique projection operators","volume":"42","author":"Behrens","year":"1994","journal-title":"IEEE Trans. Signal Process."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/17\/3198\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T15:45:17Z","timestamp":1760111117000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/17\/3198"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,8,29]]},"references-count":21,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2024,9]]}},"alternative-id":["rs16173198"],"URL":"https:\/\/doi.org\/10.3390\/rs16173198","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2024,8,29]]}}}