Spaceborne THz-ISAR Imaging of Space Target with Joint Motion Compensation Based on FrFT and GWO.
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| Title: | Spaceborne THz-ISAR Imaging of Space Target with Joint Motion Compensation Based on FrFT and GWO. |
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| Authors: | Zhou, Ao1 (AUTHOR), Yang, Qi1 (AUTHOR), Yuan, Zhian1 (AUTHOR), Wang, Hongqiang1 (AUTHOR) wanghongqiang@nudt.edu.cn, Yi, Jun1 (AUTHOR), Li, Shuangxun1 (AUTHOR) |
| Source: | Remote Sensing. Jul2025, Vol. 17 Issue 13, p2152. 24p. |
| Subjects: | Motion compensation (Signal processing), Grey Wolf Optimizer algorithm, Radar, Submillimeter wave imaging, Signal processing, Space environment |
| Abstract: | Recently, terahertz (THz) radar has been widely researched for its high-resolution in space target imaging. Due to the high rendezvous speed and the short wavelength of THz radar, the traditional stop-and-go model, along with its supporting algorithms, is not applicable. Therefore, a method that jointly compensates the intra- and inter- pulse errors of space targets' echo is proposed. The algorithm includes the following steps: firstly, a coarse estimation of targets' translational velocity at part of pulses is conducted through Fractional Fourier transform (FrFT). Then, the improved least square fitting (ILSF) is employed to parameterize the velocity–time dependency of the target. Furthermore, the concept of synthetic waveform entropy (SWE) of a one-dimensional range profile is put forward as the accuracy metric of envelope alignment. Finally, with SWE serving as the fitness function, the Grey Wolf Optimizer (GWO) algorithm is used to search for optimal estimated translation parameters. After several iterations, a fine-grained estimation of target motion parameters is achieved, while simultaneously accomplishing precise joint compensation for intra-pulse and inter-pulse errors. The validity of the proposed method is verified by numerical simulation, electromagnetic calculation data, and field-measured data. [ABSTRACT FROM AUTHOR] |
| Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 186597243 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Spaceborne THz-ISAR Imaging of Space Target with Joint Motion Compensation Based on FrFT and GWO. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhou%2C+Ao%22">Zhou, Ao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Qi%22">Yang, Qi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yuan%2C+Zhian%22">Yuan, Zhian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Hongqiang%22">Wang, Hongqiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wanghongqiang@nudt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yi%2C+Jun%22">Yi, Jun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Shuangxun%22">Li, Shuangxun</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Remote+Sensing%22">Remote Sensing</searchLink>. Jul2025, Vol. 17 Issue 13, p2152. 24p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Motion+compensation+%28Signal+processing%29%22">Motion compensation (Signal processing)</searchLink><br /><searchLink fieldCode="DE" term="%22Grey+Wolf+Optimizer+algorithm%22">Grey Wolf Optimizer algorithm</searchLink><br /><searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink><br /><searchLink fieldCode="DE" term="%22Submillimeter+wave+imaging%22">Submillimeter wave imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing%22">Signal processing</searchLink><br /><searchLink fieldCode="DE" term="%22Space+environment%22">Space environment</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Recently, terahertz (THz) radar has been widely researched for its high-resolution in space target imaging. Due to the high rendezvous speed and the short wavelength of THz radar, the traditional stop-and-go model, along with its supporting algorithms, is not applicable. Therefore, a method that jointly compensates the intra- and inter- pulse errors of space targets' echo is proposed. The algorithm includes the following steps: firstly, a coarse estimation of targets' translational velocity at part of pulses is conducted through Fractional Fourier transform (FrFT). Then, the improved least square fitting (ILSF) is employed to parameterize the velocity–time dependency of the target. Furthermore, the concept of synthetic waveform entropy (SWE) of a one-dimensional range profile is put forward as the accuracy metric of envelope alignment. Finally, with SWE serving as the fitness function, the Grey Wolf Optimizer (GWO) algorithm is used to search for optimal estimated translation parameters. After several iterations, a fine-grained estimation of target motion parameters is achieved, while simultaneously accomplishing precise joint compensation for intra-pulse and inter-pulse errors. The validity of the proposed method is verified by numerical simulation, electromagnetic calculation data, and field-measured data. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/rs17132152 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 2152 Subjects: – SubjectFull: Motion compensation (Signal processing) Type: general – SubjectFull: Grey Wolf Optimizer algorithm Type: general – SubjectFull: Radar Type: general – SubjectFull: Submillimeter wave imaging Type: general – SubjectFull: Signal processing Type: general – SubjectFull: Space environment Type: general Titles: – TitleFull: Spaceborne THz-ISAR Imaging of Space Target with Joint Motion Compensation Based on FrFT and GWO. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhou, Ao – PersonEntity: Name: NameFull: Yang, Qi – PersonEntity: Name: NameFull: Yuan, Zhian – PersonEntity: Name: NameFull: Wang, Hongqiang – PersonEntity: Name: NameFull: Yi, Jun – PersonEntity: Name: NameFull: Li, Shuangxun IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 20724292 Numbering: – Type: volume Value: 17 – Type: issue Value: 13 Titles: – TitleFull: Remote Sensing Type: main |
| ResultId | 1 |
