Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048382
Chenwei Wang, Jifang Pei, Rufei Wang, Yulin Huang, Jianyu Yang
Satellite remote sensing technology has always received wide attention for its developing performance of earth observation. Ship detection and classification based on spaceborne SAR images has been an attractive and intractable topic because the wide sea area is too complex to detect and classify all the objective ships. In this paper, a new ship detection and classification method for complex sea surface is presented. It adopts the visual saliency detection method based on spectral residual to obtain the locations of the regions of interest(ROIs) containing ships. And the morphology filter is employed to exclude a part of false alarm targets (FATs). Then, the types of the ships are classified based on convolution neural network (CNN). Finally, the locations and types of ships in large sea SAR images are acquired. Experimental results based on measured spaceborne SAR images have shown the effectiveness and accuracy of the proposed method.
{"title":"A new ship detection and classification method of spaceborne SAR images under complex scene","authors":"Chenwei Wang, Jifang Pei, Rufei Wang, Yulin Huang, Jianyu Yang","doi":"10.1109/APSAR46974.2019.9048382","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048382","url":null,"abstract":"Satellite remote sensing technology has always received wide attention for its developing performance of earth observation. Ship detection and classification based on spaceborne SAR images has been an attractive and intractable topic because the wide sea area is too complex to detect and classify all the objective ships. In this paper, a new ship detection and classification method for complex sea surface is presented. It adopts the visual saliency detection method based on spectral residual to obtain the locations of the regions of interest(ROIs) containing ships. And the morphology filter is employed to exclude a part of false alarm targets (FATs). Then, the types of the ships are classified based on convolution neural network (CNN). Finally, the locations and types of ships in large sea SAR images are acquired. Experimental results based on measured spaceborne SAR images have shown the effectiveness and accuracy of the proposed method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130075243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048354
X. Mao, Tianyue Shi, Lan Ding
Filtered backprojection (FBP) algorithm is a popular choice for nonlinear trajectory SAR image formation processing. However, how to efficiently autofocus the defocused FBP imagery is still a challenging problem. In this paper, a new interpretation of the FBP derivation is presented. Then, by incorporating the a priori knowledge on the 2-D phase error, an accurate and efficient 2-D autofocus approach is proposed. The new approach possesses much higher accuracy and efficiency than conventional blind methods. Experimental results clearly demonstrate the effectiveness and robustness of the proposed method.
{"title":"Two-dimensional Autofocus for SAR Filtered Backprojection Imagery","authors":"X. Mao, Tianyue Shi, Lan Ding","doi":"10.1109/APSAR46974.2019.9048354","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048354","url":null,"abstract":"Filtered backprojection (FBP) algorithm is a popular choice for nonlinear trajectory SAR image formation processing. However, how to efficiently autofocus the defocused FBP imagery is still a challenging problem. In this paper, a new interpretation of the FBP derivation is presented. Then, by incorporating the a priori knowledge on the 2-D phase error, an accurate and efficient 2-D autofocus approach is proposed. The new approach possesses much higher accuracy and efficiency than conventional blind methods. Experimental results clearly demonstrate the effectiveness and robustness of the proposed method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129289376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048480
J. Gong
Unmanned Aerial Vehicle (UAV) has been taken seriously by all the mighty military countries since it birthed. Synthetic Aperture Radar (SAR) has become one of the most important payload for UAV due to its good performance. In this context, this paper designs a standard embedded parallel UAV borne SAR Integrated Electronic system with multi functional modules integrated, Introduced the radar integrated electronic system and key module design universality, highly real-time and good scalability by using the standard 3U VPX architecture and the star topology based on the switch chips for the flexible interaction of data, Use results indicate it is suitable for small and light unmanned flight platforms.
{"title":"Development of Integrated Electronic System for SAR based on UAV","authors":"J. Gong","doi":"10.1109/APSAR46974.2019.9048480","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048480","url":null,"abstract":"Unmanned Aerial Vehicle (UAV) has been taken seriously by all the mighty military countries since it birthed. Synthetic Aperture Radar (SAR) has become one of the most important payload for UAV due to its good performance. In this context, this paper designs a standard embedded parallel UAV borne SAR Integrated Electronic system with multi functional modules integrated, Introduced the radar integrated electronic system and key module design universality, highly real-time and good scalability by using the standard 3U VPX architecture and the star topology based on the switch chips for the flexible interaction of data, Use results indicate it is suitable for small and light unmanned flight platforms.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128276485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048505
Duk‐jin Kim
Tidal flats which are located between land and ocean are very vulnerable to the change of environment. These places are now facing many environmental challenges related to climate change and human-induced impacts. Topographic changes related to sedimentation or erosion in tidal flats are the most evident sign of the environmental changes. The tidal flats usually have small variations of topographies and experience ebb and flood tides every day. The conventional SAR interferometric techniques (such as repeat-pass InSAR) cannot be applied for generating digital elevation models (DEMs) in these tidal flats because of low coherence caused by ebb and flood tides. In this study, we developed a long-baseline single-pass airborne interferometric SAR (InSAR) system that has a small ambiguity height. We collected InSAR data in several tidal flats, the west coast of Korean peninsula, using our airborne InSAR system and TanDEM-X. The TanDEM-X is a space borne quasi-single pass interferometic SAR system. We also investigated the expected accuracy of DEM as function of baseline and coherence. In general, longer baseline is better for generating very sensitive and fine DEM that is absolutely needed for tidal flats, because longer baseline has smaller ambiguity height. But longer baseline can also cause low coherence due to baseline decorrelation. As the baseline increase, common spectral region is also decreased resulting in poorer coherence and poor vertical accuracy. Based on these investigations, we proposed optimal baselines for airborne InSAR system and space-borne SAR system. Finally, we compared the constructed topographies from our long-baseline airborne InSAR and TanDEM-X with GPS-RTK measurements.
{"title":"Measurement of Tidal Flat Topography using Long-Baseline InSAR","authors":"Duk‐jin Kim","doi":"10.1109/APSAR46974.2019.9048505","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048505","url":null,"abstract":"Tidal flats which are located between land and ocean are very vulnerable to the change of environment. These places are now facing many environmental challenges related to climate change and human-induced impacts. Topographic changes related to sedimentation or erosion in tidal flats are the most evident sign of the environmental changes. The tidal flats usually have small variations of topographies and experience ebb and flood tides every day. The conventional SAR interferometric techniques (such as repeat-pass InSAR) cannot be applied for generating digital elevation models (DEMs) in these tidal flats because of low coherence caused by ebb and flood tides. In this study, we developed a long-baseline single-pass airborne interferometric SAR (InSAR) system that has a small ambiguity height. We collected InSAR data in several tidal flats, the west coast of Korean peninsula, using our airborne InSAR system and TanDEM-X. The TanDEM-X is a space borne quasi-single pass interferometic SAR system. We also investigated the expected accuracy of DEM as function of baseline and coherence. In general, longer baseline is better for generating very sensitive and fine DEM that is absolutely needed for tidal flats, because longer baseline has smaller ambiguity height. But longer baseline can also cause low coherence due to baseline decorrelation. As the baseline increase, common spectral region is also decreased resulting in poorer coherence and poor vertical accuracy. Based on these investigations, we proposed optimal baselines for airborne InSAR system and space-borne SAR system. Finally, we compared the constructed topographies from our long-baseline airborne InSAR and TanDEM-X with GPS-RTK measurements.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125761779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048405
Jiaming Chen, Tianqing Ling
In this paper, a Ka-band magic-T based on the modified structure of Gysel power divider is proposed. Due to the symmetrical structure, two equal in-phase outputs are achieved. The signal applied to the difference port, is split by an additional half-wavelength branch into two equal out-of-phase signals. The planar magic-T has a bandwidth of 30.3% (28–38 GHz), when the difference port and the sum port are excited, the insertion loss of the magic-T is less than −3.26 dB. The isolation between the sum/difference ports and the two input ports is better than 40 and 20 dB. As for the in-phase and out-of-phase excitation, the phase characteristics are close to the ideal 180° and 0° with only ±1.4° deviation across the band from 28 GHz to 38 GHz, the amplitude imbalances are less than ±0.05 dB.
{"title":"Design of a Ka-Band Planar Magic-T Based on modified Gysel Structure","authors":"Jiaming Chen, Tianqing Ling","doi":"10.1109/APSAR46974.2019.9048405","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048405","url":null,"abstract":"In this paper, a Ka-band magic-T based on the modified structure of Gysel power divider is proposed. Due to the symmetrical structure, two equal in-phase outputs are achieved. The signal applied to the difference port, is split by an additional half-wavelength branch into two equal out-of-phase signals. The planar magic-T has a bandwidth of 30.3% (28–38 GHz), when the difference port and the sum port are excited, the insertion loss of the magic-T is less than −3.26 dB. The isolation between the sum/difference ports and the two input ports is better than 40 and 20 dB. As for the in-phase and out-of-phase excitation, the phase characteristics are close to the ideal 180° and 0° with only ±1.4° deviation across the band from 28 GHz to 38 GHz, the amplitude imbalances are less than ±0.05 dB.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126017029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048528
Jie Cheng, Bang Huang, Wanru Tang, Z. Xu, Wen-qin Wang, Shunsheng Zhang
In this paper, a novel jamming method for spaceborne synthetic aperture radar (SAR) based on convolution frequency shift using frequency diversity array (FDA) is proposed. Firstly, we introduce the principle of convolution frequency shift jamming method based on FDA. Next in importance, range doppler (RD) algorithm for jamming signal processing is introduced. Last but not least, numerical simulation experiments are carried out, and the simulation results further prove the correctness of the theoretical derivation.
{"title":"A Deceptive Jamming Against Spaceborne SAR Based on Doppler-shift Convolutional Using FDA","authors":"Jie Cheng, Bang Huang, Wanru Tang, Z. Xu, Wen-qin Wang, Shunsheng Zhang","doi":"10.1109/APSAR46974.2019.9048528","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048528","url":null,"abstract":"In this paper, a novel jamming method for spaceborne synthetic aperture radar (SAR) based on convolution frequency shift using frequency diversity array (FDA) is proposed. Firstly, we introduce the principle of convolution frequency shift jamming method based on FDA. Next in importance, range doppler (RD) algorithm for jamming signal processing is introduced. Last but not least, numerical simulation experiments are carried out, and the simulation results further prove the correctness of the theoretical derivation.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127353215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048421
Fangfang Li, Yueting Zhang, Xiaolan Qiu
Spaceborne Interferometric Synthetic Aperture Radar (InSAR) has the capability of high precise topographic mapping for large area. However, on the one hand, digital elevation models (DEM) inversion needs at least one ground control points (GCP) to obtain absolute interferometric phase as the unwrapped phase is just a relative value. On the other hand, the baseline value used for DEM inversion also needs to be calibrated using GCPs due to the measure error. In practice, it is difficult to manually deploy GCPs especially in the area of steep topography. At present, with the improvement of orbital measure accuracy and system time accuracy for spaceborne SAR satellite, high precise absolute 3D location information of some stable point scatterers can be obtained by stereo SAR using data from different viewing angles. Therefore, this paper combines stereo SAR with InSAR. These point scatters are used as GCPs to calibrate baseline and estimate absolute phase. As a result, high accurate DEM generation without GCPs can be achieved. The experiment using TerraSAR-X data verifies the effectiveness of this method.
{"title":"An Approach for Spaceborne InSAR DEM Inversion Integrated with Stereo-SAR Method","authors":"Fangfang Li, Yueting Zhang, Xiaolan Qiu","doi":"10.1109/APSAR46974.2019.9048421","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048421","url":null,"abstract":"Spaceborne Interferometric Synthetic Aperture Radar (InSAR) has the capability of high precise topographic mapping for large area. However, on the one hand, digital elevation models (DEM) inversion needs at least one ground control points (GCP) to obtain absolute interferometric phase as the unwrapped phase is just a relative value. On the other hand, the baseline value used for DEM inversion also needs to be calibrated using GCPs due to the measure error. In practice, it is difficult to manually deploy GCPs especially in the area of steep topography. At present, with the improvement of orbital measure accuracy and system time accuracy for spaceborne SAR satellite, high precise absolute 3D location information of some stable point scatterers can be obtained by stereo SAR using data from different viewing angles. Therefore, this paper combines stereo SAR with InSAR. These point scatters are used as GCPs to calibrate baseline and estimate absolute phase. As a result, high accurate DEM generation without GCPs can be achieved. The experiment using TerraSAR-X data verifies the effectiveness of this method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114267837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048315
Yu Li, Yunhua Zhang, Xiao Dong
A new interferometric inverse synthetic aperture radar (InISAR) imaging method based on a L shape three-antenna interferometric radar geometry and dominant-scatterer phase focusing is presented in this paper. Under this InISAR model, the distance of the target in the baseline direction introduces additional interferometric phase offset, which can cause phase ambiguity, so the interferometric phase must be corrected before interferometric processing. Firstly, a strong scattering point is searched for as a reference point in the image domain, and then the phase of the scattering point is used as the reference phase for phase focusing on each ISAR image respectively to unwrap the interferometric phase, so that the 3D coordinates of the target can be correctly retrieved. Simulation results confirm the effectiveness of the method.
{"title":"An InISAR Imaging Method Based on Dominant-Scatterer Phase Focusing","authors":"Yu Li, Yunhua Zhang, Xiao Dong","doi":"10.1109/APSAR46974.2019.9048315","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048315","url":null,"abstract":"A new interferometric inverse synthetic aperture radar (InISAR) imaging method based on a L shape three-antenna interferometric radar geometry and dominant-scatterer phase focusing is presented in this paper. Under this InISAR model, the distance of the target in the baseline direction introduces additional interferometric phase offset, which can cause phase ambiguity, so the interferometric phase must be corrected before interferometric processing. Firstly, a strong scattering point is searched for as a reference point in the image domain, and then the phase of the scattering point is used as the reference phase for phase focusing on each ISAR image respectively to unwrap the interferometric phase, so that the 3D coordinates of the target can be correctly retrieved. Simulation results confirm the effectiveness of the method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114445501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048504
L. Qiu, Wei Qu, Hongfeng Pang, Jun Yang
Stationary human target localization is a key issue in through-the-wall sensing applications. When there are multiple stationary human targets, wrong data association may result in localization of false alarms. This paper proposes an approach of multiple stationary targets localization based on data association using UWB MIMO radar with one transmitting and two receiving antennas. First, the number and distances of stationary human targets are detected on each channel separately, then correlation coefficient matrix is introduced to evaluate the association probability of targets from different channels, finally the targets are located with no artifacts. Simulation and experimental results verified the superiority of the proposed approach.
固定人体目标定位是穿墙传感应用中的一个关键问题。当存在多个静止人体目标时，错误的数据关联可能会导致定位误报。本文提出了一种基于数据关联的多静止目标定位方法，使用具有一个发射天线和两个接收天线的 UWB MIMO 雷达。首先，在每个信道上分别检测静止人体目标的数量和距离，然后引入相关系数矩阵来评估不同信道目标的关联概率，最后对目标进行无伪影定位。仿真和实验结果验证了所提方法的优越性。
{"title":"Multiple Stationary Human Targets Localization in Through-the-wall UWB MIMO Radar","authors":"L. Qiu, Wei Qu, Hongfeng Pang, Jun Yang","doi":"10.1109/APSAR46974.2019.9048504","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048504","url":null,"abstract":"Stationary human target localization is a key issue in through-the-wall sensing applications. When there are multiple stationary human targets, wrong data association may result in localization of false alarms. This paper proposes an approach of multiple stationary targets localization based on data association using UWB MIMO radar with one transmitting and two receiving antennas. First, the number and distances of stationary human targets are detected on each channel separately, then correlation coefficient matrix is introduced to evaluate the association probability of targets from different channels, finally the targets are located with no artifacts. Simulation and experimental results verified the superiority of the proposed approach.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125775122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048447
He Huang, Penghui Huang, Xingzhao Liu, Robert Wang, Junli Chen, Yanyang Liu
Due to the constraint of the minimum antenna restriction, there is an irreconcilable contradiction between high resolution and wide swath (HRWS) in a single-channel spaceborne synthetic aperture radar (SAR) system. To address this contradiction, the use of azimuth multichannel system can effectively realize the HRWS SAR imaging by taking the beam forming techniques. In this paper, a novel unambiguous spectrum reconstruction algorithm for space-borne multichannel HRWS SAR imaging is proposed. The proposed method firstly compensates the linear phase structure related to the along-track baseline in the Doppler domain. Then, the covariance matrix is reconstructed along azimuth direction based on adaptive iterative algorithm (IAA). Hence, based on the estimated covariance matrix, an unambiguous signal spectrum can be accurately restored according to the linearly constrained minimum variance (LCMV) criterion. Finally, a well-focused HRWS SAR image can be obtained by applying the typical SAR image algorithm. The major advantage of the proposed method is that it can realize the azimuth ambiguity elimination in a non-homogeneous scene. Both simulated and real data processing results are used to validate the effectiveness of the proposed method.
{"title":"A Novel Unambiguous Spectrum Reconstruction Algorithm for Space-borne High Resolution and Wide Swath SAR Imaging Based on Iterative Adaptive Algorithm","authors":"He Huang, Penghui Huang, Xingzhao Liu, Robert Wang, Junli Chen, Yanyang Liu","doi":"10.1109/APSAR46974.2019.9048447","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048447","url":null,"abstract":"Due to the constraint of the minimum antenna restriction, there is an irreconcilable contradiction between high resolution and wide swath (HRWS) in a single-channel spaceborne synthetic aperture radar (SAR) system. To address this contradiction, the use of azimuth multichannel system can effectively realize the HRWS SAR imaging by taking the beam forming techniques. In this paper, a novel unambiguous spectrum reconstruction algorithm for space-borne multichannel HRWS SAR imaging is proposed. The proposed method firstly compensates the linear phase structure related to the along-track baseline in the Doppler domain. Then, the covariance matrix is reconstructed along azimuth direction based on adaptive iterative algorithm (IAA). Hence, based on the estimated covariance matrix, an unambiguous signal spectrum can be accurately restored according to the linearly constrained minimum variance (LCMV) criterion. Finally, a well-focused HRWS SAR image can be obtained by applying the typical SAR image algorithm. The major advantage of the proposed method is that it can realize the azimuth ambiguity elimination in a non-homogeneous scene. Both simulated and real data processing results are used to validate the effectiveness of the proposed method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126034740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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