Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging
Terahertz synthetic aperture radar (THz SAR) imaging can provide higher resolution, but significantly affected by tiny motion error. Here, THz SAR image focusing-oriented dual-stage processing framework and Tsallis entropy-based nonparametric image focusing algorithm are proposed. First, by distingu...
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10994342/ |
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| author | Siyu Chen Yong Wang Hongzhi Li |
| author_facet | Siyu Chen Yong Wang Hongzhi Li |
| author_sort | Siyu Chen |
| collection | DOAJ |
| description | Terahertz synthetic aperture radar (THz SAR) imaging can provide higher resolution, but significantly affected by tiny motion error. Here, THz SAR image focusing-oriented dual-stage processing framework and Tsallis entropy-based nonparametric image focusing algorithm are proposed. First, by distinguishing fundamental principles from specific application and implementation particulars, the proposed framework integrates the model constructed by multiple THz SAR image defocusing factors and the dual-strategy THz SAR image focusing algorithm driven by different defocusing factors. In Stage One, we construct a general platform vibration model based on THz SAR platform characteristics and phase error model related to other nonideal factors, which are suitable for diverse THz SAR imaging scenarios. In Stage Two, we investigate the dual-strategy focusing algorithm based on specific simple harmonic model and image quality measurement criterion to address different defocusing factors. Second, as a specific implementation of the above framework, we construct the THz SAR signal model by considering the multicomponent time-varying amplitude vibration and other nonideal factors, and further propose Tsallis entropy-based THz SAR image focusing method by equivalent nonlinear equations system conversion. To better correct the complex and irregular phase error, the first and second partial derivatives of the Tsallis entropy in phase error estimation are precisely derived. By extending Shannon entropy, Tsallis entropy can further provide a tradeoff between image focusing efficiency and accuracy through changing its nonextensive parameter. Finally, the simulated and real-measured data verify the feasibility of the proposed framework and method by comparing with different methods in complex THz SAR imaging scenes. |
| format | Article |
| id | doaj-art-5bc85a2efa4a46e49d5e15d3771cdd0c |
| institution | OA Journals |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-5bc85a2efa4a46e49d5e15d3771cdd0c2025-08-20T02:04:00ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-0118128451286410.1109/JSTARS.2025.356847310994342Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR ImagingSiyu Chen0https://orcid.org/0009-0005-7747-2852Yong Wang1https://orcid.org/0000-0002-4934-9831Hongzhi Li2https://orcid.org/0000-0001-6457-6496Research Institute of Electronic Engineering Technology, Harbin Institute of Technology, Harbin, ChinaResearch Institute of Electronic Engineering Technology, Harbin Institute of Technology, Harbin, ChinaResearch Institute of Electronic Engineering Technology, Harbin Institute of Technology, Harbin, ChinaTerahertz synthetic aperture radar (THz SAR) imaging can provide higher resolution, but significantly affected by tiny motion error. Here, THz SAR image focusing-oriented dual-stage processing framework and Tsallis entropy-based nonparametric image focusing algorithm are proposed. First, by distinguishing fundamental principles from specific application and implementation particulars, the proposed framework integrates the model constructed by multiple THz SAR image defocusing factors and the dual-strategy THz SAR image focusing algorithm driven by different defocusing factors. In Stage One, we construct a general platform vibration model based on THz SAR platform characteristics and phase error model related to other nonideal factors, which are suitable for diverse THz SAR imaging scenarios. In Stage Two, we investigate the dual-strategy focusing algorithm based on specific simple harmonic model and image quality measurement criterion to address different defocusing factors. Second, as a specific implementation of the above framework, we construct the THz SAR signal model by considering the multicomponent time-varying amplitude vibration and other nonideal factors, and further propose Tsallis entropy-based THz SAR image focusing method by equivalent nonlinear equations system conversion. To better correct the complex and irregular phase error, the first and second partial derivatives of the Tsallis entropy in phase error estimation are precisely derived. By extending Shannon entropy, Tsallis entropy can further provide a tradeoff between image focusing efficiency and accuracy through changing its nonextensive parameter. Finally, the simulated and real-measured data verify the feasibility of the proposed framework and method by comparing with different methods in complex THz SAR imaging scenes.https://ieeexplore.ieee.org/document/10994342/Dual-stage processing framework for terahertz synthetic aperture radar (THz SAR) image focusingmulticomponent time-varying amplitude platform vibration modelingTHz SARTsallis entropy-based nonparametric image focusing method |
| spellingShingle | Siyu Chen Yong Wang Hongzhi Li Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Dual-stage processing framework for terahertz synthetic aperture radar (THz SAR) image focusing multicomponent time-varying amplitude platform vibration modeling THz SAR Tsallis entropy-based nonparametric image focusing method |
| title | Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging |
| title_full | Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging |
| title_fullStr | Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging |
| title_full_unstemmed | Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging |
| title_short | Tsallis Entropy-Based Nonparametric Focusing Algorithm Under Dual-Stage Processing Framework for THz SAR Imaging |
| title_sort | tsallis entropy based nonparametric focusing algorithm under dual stage processing framework for thz sar imaging |
| topic | Dual-stage processing framework for terahertz synthetic aperture radar (THz SAR) image focusing multicomponent time-varying amplitude platform vibration modeling THz SAR Tsallis entropy-based nonparametric image focusing method |
| url | https://ieeexplore.ieee.org/document/10994342/ |
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