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Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals

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 cau...

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Detalles Bibliográficos
Autores principales: Deng, Yaqi, Li, Wenguo, Zhang, Saiwen, Wang, Fulong, Xiao, Weichu, Cui, Zhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8512584/
https://www.ncbi.nlm.nih.gov/pubmed/34640659
http://dx.doi.org/10.3390/s21196339
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author Deng, Yaqi
Li, Wenguo
Zhang, Saiwen
Wang, Fulong
Xiao, Weichu
Cui, Zhi
author_facet Deng, Yaqi
Li, Wenguo
Zhang, Saiwen
Wang, Fulong
Xiao, Weichu
Cui, Zhi
author_sort Deng, Yaqi
collection PubMed
description 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.
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spelling pubmed-85125842021-10-14 Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals Deng, Yaqi Li, Wenguo Zhang, Saiwen Wang, Fulong Xiao, Weichu Cui, Zhi Sensors (Basel) Article 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. MDPI 2021-09-23 /pmc/articles/PMC8512584/ /pubmed/34640659 http://dx.doi.org/10.3390/s21196339 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Deng, Yaqi
Li, Wenguo
Zhang, Saiwen
Wang, Fulong
Xiao, Weichu
Cui, Zhi
Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title_full Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title_fullStr Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title_full_unstemmed Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title_short Clutter Suppression Method for Off-Grid Effects Mitigation in Airborne Passive Radars with Contaminated Reference Signals
title_sort clutter suppression method for off-grid effects mitigation in airborne passive radars with contaminated reference signals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8512584/
https://www.ncbi.nlm.nih.gov/pubmed/34640659
http://dx.doi.org/10.3390/s21196339
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