Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images
Autofocus is an essential technique for airborne synthetic aperture radar (SAR) imaging to correct phase errors mainly due to unexpected motion error. There are several well-known conventional autofocus methods such as phase gradient autofocus (PGA) and minimum entropy (ME). Although these methods a...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/7/2370 |
| _version_ | 1827696475827601408 |
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| author | Haemin Lee Chang-Sik Jung Ki-Wan Kim |
| author_facet | Haemin Lee Chang-Sik Jung Ki-Wan Kim |
| author_sort | Haemin Lee |
| collection | DOAJ |
| description | Autofocus is an essential technique for airborne synthetic aperture radar (SAR) imaging to correct phase errors mainly due to unexpected motion error. There are several well-known conventional autofocus methods such as phase gradient autofocus (PGA) and minimum entropy (ME). Although these methods are still widely used for various SAR applications, each method has drawbacks such as limited bandwidth of estimation, low convergence rate, huge computation burden, etc. In this paper, feature preserving autofocus (FPA) algorithm is newly proposed. The algorithm is based on the minimization of the cost function containing a regularization term. The algorithm is designed for postprocessing purpose, which is different from the existing regularization-based algorithms such as sparsity-driven autofocus (SDA). This difference makes the proposed method far more straightforward and efficient than those existing algorithms. The experimental results show that the proposed algorithm achieves better performance, convergence, and robustness than the existing postprocessing autofocus algorithms. |
| first_indexed | 2024-03-10T12:48:10Z |
| format | Article |
| id | doaj.art-2cbf99227c004d9c87bd2601f2711975 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T12:48:10Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-2cbf99227c004d9c87bd2601f27119752023-11-21T13:16:45ZengMDPI AGSensors1424-82202021-03-01217237010.3390/s21072370Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR ImagesHaemin Lee0Chang-Sik Jung1Ki-Wan Kim2Agency for Defense Development, Yuseong P.O. Box 35, Daejeon 34186, KoreaAgency for Defense Development, Yuseong P.O. Box 35, Daejeon 34186, KoreaAgency for Defense Development, Yuseong P.O. Box 35, Daejeon 34186, KoreaAutofocus is an essential technique for airborne synthetic aperture radar (SAR) imaging to correct phase errors mainly due to unexpected motion error. There are several well-known conventional autofocus methods such as phase gradient autofocus (PGA) and minimum entropy (ME). Although these methods are still widely used for various SAR applications, each method has drawbacks such as limited bandwidth of estimation, low convergence rate, huge computation burden, etc. In this paper, feature preserving autofocus (FPA) algorithm is newly proposed. The algorithm is based on the minimization of the cost function containing a regularization term. The algorithm is designed for postprocessing purpose, which is different from the existing regularization-based algorithms such as sparsity-driven autofocus (SDA). This difference makes the proposed method far more straightforward and efficient than those existing algorithms. The experimental results show that the proposed algorithm achieves better performance, convergence, and robustness than the existing postprocessing autofocus algorithms.https://www.mdpi.com/1424-8220/21/7/2370autofocusfeature preserving regularizationphase errorssynthetic aperture radar (SAR) |
| spellingShingle | Haemin Lee Chang-Sik Jung Ki-Wan Kim Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images Sensors autofocus feature preserving regularization phase errors synthetic aperture radar (SAR) |
| title | Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images |
| title_full | Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images |
| title_fullStr | Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images |
| title_full_unstemmed | Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images |
| title_short | Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images |
| title_sort | feature preserving autofocus algorithm for phase error correction of sar images |
| topic | autofocus feature preserving regularization phase errors synthetic aperture radar (SAR) |
| url | https://www.mdpi.com/1424-8220/21/7/2370 |
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