{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:21:36Z","timestamp":1760235696616,"version":"build-2065373602"},"reference-count":38,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2021,9,23]],"date-time":"2021-09-23T00:00:00Z","timestamp":1632355200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61771191"],"award-info":[{"award-number":["61771191"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004735","name":"Natural Science Foundation of\u00a0Hunan Province","doi-asserted-by":"publisher","award":["2020JJ4158","2020JJ4213"],"award-info":[{"award-number":["2020JJ4158","2020JJ4213"]}],"id":[{"id":"10.13039\/501100004735","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Scientific Research Fund of Hunan Provincial Education Department","award":["19A084","19B100","19B105"],"award-info":[{"award-number":["19A084","19B100","19B105"]}]},{"name":"Hunan Provincial Science Foundation of China","award":["2021JJ40029"],"award-info":[{"award-number":["2021JJ40029"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>For an airborne passive radar with contaminated reference signals, the clutter caused by multipath (MP) signals involved in the reference channel (MP clutter) corrupts the covariance estimation in space-time adaptive processing (STAP). In order to overcome the severe STAP performance degradation caused by impure reference signals and off-grid effects, a novel MP clutter suppression method based on local search is proposed for airborne passive radar. In the proposed method, the global dictionary is constructed based on the sparse measurement model of MP clutter, and the global atoms that are most relevant to the residual are selected. Then, the local dictionary is designed iteratively, and local searches are performed to match real MP clutter points. Finally, the off-grid effects are mitigated, and the MP clutter is suppressed from all matched atoms. A range of simulations is conducted in order to demonstrate the effectiveness of the proposed method.<\/jats:p>","DOI":"10.3390\/s21196339","type":"journal-article","created":{"date-parts":[[2021,9,27]],"date-time":"2021-09-27T22:16:38Z","timestamp":1632780998000},"page":"6339","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals"],"prefix":"10.3390","volume":"21","author":[{"given":"Yaqi","family":"Deng","sequence":"first","affiliation":[{"name":"College of Information and Electronic Engineering, Hunan City University, No. 518, Yingbin East Road, Yiyang 413000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenguo","family":"Li","sequence":"additional","affiliation":[{"name":"College of Information and Electronic Engineering, Hunan City University, No. 518, Yingbin East Road, Yiyang 413000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saiwen","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Information and Electronic Engineering, Hunan City University, No. 518, Yingbin East Road, Yiyang 413000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fulong","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Information and Electronic Engineering, Hunan City University, No. 518, Yingbin East Road, Yiyang 413000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weichu","family":"Xiao","sequence":"additional","affiliation":[{"name":"College of Electrical and Information Engineering, Hunan University, No. 2, Lushan South Road, Yuelu District, Changsha 410082, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhi","family":"Cui","sequence":"additional","affiliation":[{"name":"College of Information and Electronic Engineering, Hunan City University, No. 518, Yingbin East Road, Yiyang 413000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"420","DOI":"10.1007\/s00034-019-01192-0","article-title":"Low-complexity channelizer based on FRM for passive radar multi-channel wideband receiver","volume":"39","author":"Zhang","year":"2020","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1049\/iet-rsn.2015.0006","article-title":"Efficient architecture and hardware implementation of coherent integration processor for digital video broadcast-based passive bistatic radar","volume":"10","author":"Shan","year":"2016","journal-title":"IET Radar Sonar Navig."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1347","DOI":"10.1109\/TAES.2012.6178066","article-title":"DPCA Detection of Moving Targets in Airborne Passive Radar","volume":"48","author":"Dawidowicz","year":"2012","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1049\/iet-rsn.2013.0190","article-title":"Space\u2013time interference analysis and suppression for airborne passive radar using transmissions of opportunity","volume":"8","author":"Tan","year":"2014","journal-title":"IET Radar Sonar Navig."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"967","DOI":"10.1109\/TAES.2018.2867688","article-title":"Reciprocal-Filter-Based STAP for Passive Radar on Moving Platforms","volume":"55","author":"Wojaczek","year":"2019","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"50","DOI":"10.1109\/MAES.2012.6380826","article-title":"Passive bistatic radar experiments from an airborne platform","volume":"27","author":"Brown","year":"2012","journal-title":"IEEE Aerosp. Electron. Syst. Mag."},{"key":"ref_7","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, London, UK.","DOI":"10.1049\/ic:19980240"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Klemm, R. (2006). Principles of Space-Time Adaptive Processing, Institute of Electical Engineering. [3rd ed.].","DOI":"10.1049\/PBRA021E"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"4136","DOI":"10.1007\/s00034-017-0743-y","article-title":"An improving EFA for clutter suppression by using the persymmetric covariance matrix estimation","volume":"37","author":"Zhou","year":"2018","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"3370","DOI":"10.1007\/s00034-018-1016-0","article-title":"A fast iterative three-dimensional joint domain localized method in airborne MIMO radar","volume":"38","author":"Zhou","year":"2019","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1109\/TSP.2019.2957640","article-title":"Robust two-stage reduced-dimension sparsity-aware STAP for airborne radar with coprime arrays","volume":"68","author":"Wang","year":"2020","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"987","DOI":"10.1007\/s00034-014-9874-6","article-title":"Adaptive clutter nulling Approach for heterogeneous environments","volume":"34","author":"Chen","year":"2015","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"4550","DOI":"10.1109\/TSP.2016.2569471","article-title":"Fast STAP method based on PAST with sparse constraint for airborne phased array radar","volume":"64","author":"Yang","year":"2016","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1049\/iet-rsn.2013.0043","article-title":"Median matrices and their application to radar training data selection","volume":"8","author":"Aubry","year":"2014","journal-title":"IET Radar Sonar Navig."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1109\/LGRS.2016.2635104","article-title":"A novel STAP based on spectrum-aided reduced-dimension clutter sparse recovery","volume":"14","author":"Han","year":"2017","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1049\/iet-spr.2014.0255","article-title":"Knowledge-aided STAP with sparse-recovery by exploiting spatio-temporal sparsity","volume":"10","author":"Yang","year":"2016","journal-title":"IET Signal Process."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"527","DOI":"10.1109\/LGRS.2018.2799329","article-title":"Knowledge-aided covariance matrix estimation via Kronecker product expansions for airborne STAP","volume":"15","author":"Sun","year":"2018","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1088","DOI":"10.1109\/TSP.2010.2096218","article-title":"Sparse learning via iterative minimization with application to MIMO radar imaging","volume":"59","author":"Tan","year":"2011","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1396","DOI":"10.1109\/TSP.2018.2886166","article-title":"Multi-snapshot spectrum sensing for cognitive radar via block-sparsity exploitation","volume":"67","author":"Aubry","year":"2019","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"462","DOI":"10.1109\/LGRS.2016.2519765","article-title":"Subspace-augmented clutter suppression technique for STAP radar","volume":"13","author":"Wang","year":"2016","journal-title":"Geosci. Remote Sens. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2756","DOI":"10.1109\/TAES.2017.2714938","article-title":"Sparsity-based STAP using alternating direction method with gain\/phase errors","volume":"53","author":"Yang","year":"2017","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1007\/s00034-016-0301-z","article-title":"Sparsity-Based direct data domain space-time adaptive processing with intrinsic clutter motion","volume":"36","author":"Yang","year":"2017","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Guo, S., Wang, J., Ma, H., and Wang, J. (2020). Modified blind equalization algorithm based on cyclostationarity for contaminated referent signal in airborne PBR. Sensors, 20.","DOI":"10.3390\/s20030788"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"50317","DOI":"10.1109\/ACCESS.2019.2911136","article-title":"Cascaded suppression method for airborne passive radar with contaminated reference signal","volume":"7","author":"Deng","year":"2019","journal-title":"IEEE Access"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"016514","DOI":"10.1117\/1.JRS.15.016514","article-title":"Clutter suppression methods based on reduced-dimension transformation for airborne passive radar with impure reference signals","volume":"15","author":"Deng","year":"2021","journal-title":"J. Appl. Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1355","DOI":"10.1109\/LSP.2020.3010161","article-title":"An off-grid STAP algorithm based on local mesh splitting with bistatic radar system","volume":"27","author":"He","year":"2020","journal-title":"IEEE Signal Process. Lett."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1862","DOI":"10.1109\/LGRS.2018.2865536","article-title":"Low-complexity off-grid algorithm based on local search clutter subspace estimation","volume":"15","author":"Li","year":"2018","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2004","DOI":"10.1109\/JSEN.2015.2508059","article-title":"Direction of arrival estimation for off-grid signals based on sparse Bayesian learning","volume":"16","author":"Wu","year":"2016","journal-title":"IEEE Sensors J."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1109\/LSP.2016.2636319","article-title":"Root sparse Bayesian learning for off-grid DOA estimation","volume":"24","author":"Dai","year":"2017","journal-title":"IEEE Signal Process. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1109\/TSP.2012.2222378","article-title":"Off-grid direction of arrival estimation using sparse inference","volume":"61","author":"Yang","year":"2013","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"557","DOI":"10.1049\/iet-rsn.2017.0425","article-title":"Off-grid effects mitigation exploiting knowledge of the clutter ridge for sparse recovery STAP","volume":"12","author":"Duan","year":"2018","journal-title":"IET Radar Sonar Navig."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1540","DOI":"10.1049\/iet-rsn.2017.0102","article-title":"Efficient joint probabilistic data association filter based on Kullback\u2013Leibler divergence for multi-target tracking","volume":"11","author":"Zhu","year":"2017","journal-title":"IET Radar Sonar Navig."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1049\/iet-rsn.2016.0256","article-title":"Robust STAP algorithm based on knowledge-aided SR for airborne radar","volume":"11","author":"Gao","year":"2017","journal-title":"IET Radar Sonar Navig."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"174","DOI":"10.1049\/ip-rsn:20045026","article-title":"Masking effect and its removal in PCL radar","volume":"152","author":"Kulpa","year":"2005","journal-title":"IEE Proc. -Radar Sonar Navig."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1222","DOI":"10.1109\/TSP.2016.2620115","article-title":"On the statistical invariance for adaptive radar detection in partially homogeneous disturbance plus structured interference","volume":"65","author":"Ciuonzo","year":"2016","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"6498","DOI":"10.1109\/TSP.2019.2954499","article-title":"Adaptive detection of coherent radar targets in the presence of noise jamming","volume":"67","author":"Addabbo","year":"2019","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1109\/7.845243","article-title":"Clutter and jammer multipath cancellation in airborne adaptive radar","volume":"36","author":"Rabideau","year":"2000","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_38","first-page":"436","article-title":"Adaptive detection and estimation in the presence of useful signal and interference mismatches","volume":"57","author":"Huang","year":"2008","journal-title":"IEEE Trans. Signal Process."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/19\/6339\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T07:03:31Z","timestamp":1760166211000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/19\/6339"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,9,23]]},"references-count":38,"journal-issue":{"issue":"19","published-online":{"date-parts":[[2021,10]]}},"alternative-id":["s21196339"],"URL":"https:\/\/doi.org\/10.3390\/s21196339","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2021,9,23]]}}}