Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency
A sea surface imaging technique for an emergency response using a ready-made frequency modulated continuous wave–synthetic aperture radar (FMCW SAR) system and its experimental results are described in this paper. The optimal range of radiowave incidence angle for sea surface imaging was analyzed by...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/24/7310 |
| _version_ | 1797544142852587520 |
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| author | Ji-hwan Hwang Duk-jin Kim |
| author_facet | Ji-hwan Hwang Duk-jin Kim |
| author_sort | Ji-hwan Hwang |
| collection | DOAJ |
| description | A sea surface imaging technique for an emergency response using a ready-made frequency modulated continuous wave–synthetic aperture radar (FMCW SAR) system and its experimental results are described in this paper. The optimal range of radiowave incidence angle for sea surface imaging was analyzed by a theoretical scattering model and measurement data, and it was properly applied to the FMCW SAR system by readjusting the delayed-dechirp process. Raw data acquired through flight experiments were reconstructed to SAR image by the range-doppler algorithm. To verify the performance of the reconstructed sea surface image, dual-channel images collected by the configuration of the along-track interferometry were used, and then performance indicators such as signal attenuation, coherence, and phase difference were analyzed. Through this experimental study, it was confirmed that the ready-made FMCW SAR system without a function of the incident angle control can also conduct limited missions for maritime observation. It is possible to be an alternative resource for emergency response, in which the cases are requiring urgent maritime disaster detection and analysis. |
| first_indexed | 2024-03-10T13:55:13Z |
| format | Article |
| id | doaj.art-6df59ce28c7e4fb5a944397eed72c20c |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T13:55:13Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6df59ce28c7e4fb5a944397eed72c20c2023-11-21T01:39:36ZengMDPI AGSensors1424-82202020-12-012024731010.3390/s20247310Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on EmergencyJi-hwan Hwang0Duk-jin Kim1Research Institute of Basic Sciences, Seoul National University, Seoul 88026, KoreaSchool of Earth and Environmental Science, Seoul National University, Seoul 88026, KoreaA sea surface imaging technique for an emergency response using a ready-made frequency modulated continuous wave–synthetic aperture radar (FMCW SAR) system and its experimental results are described in this paper. The optimal range of radiowave incidence angle for sea surface imaging was analyzed by a theoretical scattering model and measurement data, and it was properly applied to the FMCW SAR system by readjusting the delayed-dechirp process. Raw data acquired through flight experiments were reconstructed to SAR image by the range-doppler algorithm. To verify the performance of the reconstructed sea surface image, dual-channel images collected by the configuration of the along-track interferometry were used, and then performance indicators such as signal attenuation, coherence, and phase difference were analyzed. Through this experimental study, it was confirmed that the ready-made FMCW SAR system without a function of the incident angle control can also conduct limited missions for maritime observation. It is possible to be an alternative resource for emergency response, in which the cases are requiring urgent maritime disaster detection and analysis.https://www.mdpi.com/1424-8220/20/24/7310sea surface imagingairborne FMCW SARdelayed-dechirp processincidence angle |
| spellingShingle | Ji-hwan Hwang Duk-jin Kim Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency Sensors sea surface imaging airborne FMCW SAR delayed-dechirp process incidence angle |
| title | Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency |
| title_full | Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency |
| title_fullStr | Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency |
| title_full_unstemmed | Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency |
| title_short | Sea Surface Imaging with a Shortened Delayed-Dechirp Process of Airborne FMCW SAR for Ocean Monitoring on Emergency |
| title_sort | sea surface imaging with a shortened delayed dechirp process of airborne fmcw sar for ocean monitoring on emergency |
| topic | sea surface imaging airborne FMCW SAR delayed-dechirp process incidence angle |
| url | https://www.mdpi.com/1424-8220/20/24/7310 |
| work_keys_str_mv | AT jihwanhwang seasurfaceimagingwithashorteneddelayeddechirpprocessofairbornefmcwsarforoceanmonitoringonemergency AT dukjinkim seasurfaceimagingwithashorteneddelayeddechirpprocessofairbornefmcwsarforoceanmonitoringonemergency |