Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems
In a dual-channel circular synthetic aperture radar (CSAR) and ground moving target indication (GMTI) system, the antenna baseline is not parallel with the flight path due to a yaw angle. The angle causes a varying group-phase shift between the dual-channel signals and therefore degrades the correla...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-12-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/20/1/158 |
| _version_ | 1798026054909034496 |
|---|---|
| author | Laihe Wang Yueli Li Wu Wang Daoxiang An |
| author_facet | Laihe Wang Yueli Li Wu Wang Daoxiang An |
| author_sort | Laihe Wang |
| collection | DOAJ |
| description | In a dual-channel circular synthetic aperture radar (CSAR) and ground moving target indication (GMTI) system, the antenna baseline is not parallel with the flight path due to a yaw angle. The angle causes a varying group-phase shift between the dual-channel signals and therefore degrades the correlation between the image pair. Therefore, the group-phase shift needs to be removed before channel equalization. To resolve the problem, the interferometric phase term was deduced and analyzed based on the geometry of a dual-channel CSAR system. Then, the varying phase term with respect to the Doppler frequency and the varying group-phase shift over the range were compensated for in the channel registration. Furthermore, blind channel equalization, including two-dimensional calibration and amplitude equalization, was applied to eliminate the amplitude and residual phase differences between the channels. Finally, the amplitude image obtained using a displaced phase center antenna (DPCA) was multiplied by the phase image obtained with along-track interferometry (ATI) to detect moving targets. The experimental results verified the effectiveness of the method for both uniform and non-uniform clutter suppression. |
| first_indexed | 2024-04-11T18:29:01Z |
| format | Article |
| id | doaj.art-b3194cfa73114ffb900378cf15d5665b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T18:29:01Z |
| publishDate | 2019-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-b3194cfa73114ffb900378cf15d5665b2022-12-22T04:09:31ZengMDPI AGSensors1424-82202019-12-0120115810.3390/s20010158s20010158Moving Target Indication for Dual-Channel Circular SAR/GMTI SystemsLaihe Wang0Yueli Li1Wu Wang2Daoxiang An3College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, ChinaCollege of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, ChinaIn a dual-channel circular synthetic aperture radar (CSAR) and ground moving target indication (GMTI) system, the antenna baseline is not parallel with the flight path due to a yaw angle. The angle causes a varying group-phase shift between the dual-channel signals and therefore degrades the correlation between the image pair. Therefore, the group-phase shift needs to be removed before channel equalization. To resolve the problem, the interferometric phase term was deduced and analyzed based on the geometry of a dual-channel CSAR system. Then, the varying phase term with respect to the Doppler frequency and the varying group-phase shift over the range were compensated for in the channel registration. Furthermore, blind channel equalization, including two-dimensional calibration and amplitude equalization, was applied to eliminate the amplitude and residual phase differences between the channels. Finally, the amplitude image obtained using a displaced phase center antenna (DPCA) was multiplied by the phase image obtained with along-track interferometry (ATI) to detect moving targets. The experimental results verified the effectiveness of the method for both uniform and non-uniform clutter suppression.https://www.mdpi.com/1424-8220/20/1/158dual-channel circular synthetic aperture radarmoving target detectionchannel registrationchannel equalizationclutter suppression |
| spellingShingle | Laihe Wang Yueli Li Wu Wang Daoxiang An Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems Sensors dual-channel circular synthetic aperture radar moving target detection channel registration channel equalization clutter suppression |
| title | Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems |
| title_full | Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems |
| title_fullStr | Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems |
| title_full_unstemmed | Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems |
| title_short | Moving Target Indication for Dual-Channel Circular SAR/GMTI Systems |
| title_sort | moving target indication for dual channel circular sar gmti systems |
| topic | dual-channel circular synthetic aperture radar moving target detection channel registration channel equalization clutter suppression |
| url | https://www.mdpi.com/1424-8220/20/1/158 |
| work_keys_str_mv | AT laihewang movingtargetindicationfordualchannelcircularsargmtisystems AT yuelili movingtargetindicationfordualchannelcircularsargmtisystems AT wuwang movingtargetindicationfordualchannelcircularsargmtisystems AT daoxiangan movingtargetindicationfordualchannelcircularsargmtisystems |