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2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)最新文献

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A Slope Adaptive Filtering Method for Multi-frequency InSAR 多频InSAR的斜率自适应滤波方法
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688504
You Zhenwan, X. Huaping, Li Shuo, Li Wei
{"title":"A Slope Adaptive Filtering Method for Multi-frequency InSAR","authors":"You Zhenwan, X. Huaping, Li Shuo, Li Wei","doi":"10.1109/APSAR52370.2021.9688504","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688504","url":null,"abstract":"The noise in the interferogram directly affects the accuracy and speed of phase unwrapping. Therefore, interferometric phase filtering is performed to suppress phase noise, thereby reducing difficulty on subsequent phase unwrapping. The slope adaptive filtering is widely applied because of its ability to maintain interferometric fringes well. But the ability of existing slope adaptive filtering methods are limited because a smaller window have to be used for fringe estimation in dense fringe areas. In this paper, a multi-frequency slope adaptive filtering method is proposed to enlarge the filter window size in dense fringe. It converts the low-frequency interferometric phase to the high-frequency reference terrain phase, uses a larger window to perform noise suppression on the residual phase after removing the reference terrain phase from high-frequency phase. So a better noise suppression effect is obtained in dense fringe area. Experimental results with simulated and real data demonstrate the effectiveness of the proposed method.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129479223","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}
引用次数: 0
Flood Area Observation Using Quad-polarimetric SAR Data Based on Model-based Decomposition 基于模型分解的四极化SAR数据洪区观测
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688368
R. Sato, Ryunosuke Kubo, H. Yamada
{"title":"Flood Area Observation Using Quad-polarimetric SAR Data Based on Model-based Decomposition","authors":"R. Sato, Ryunosuke Kubo, H. Yamada","doi":"10.1109/APSAR52370.2021.9688368","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688368","url":null,"abstract":"This paper proposes an effective usage of the model-based decomposition by considering the behavior of the Degree of Polarization (DoP) to improve the accuracy of observation using quad-polarimetric SAR data for flooded residential area. The nonnegative eigenvalue decomposition (NNED) is used as the decomposition method. For the volume scattering model in the decomposition, we utilize the Yamaguchi volume scattering model, in which three kinds of distributions are used in relation to physical distribution of the vegetation target under observation. Along with the decomposition, we also examine the variation of the DoP before and after a flood event. By considering the time variations of both the double bounce scattering and the DoP, damage situation of the flood around residential area can be estimated. We show some experimental results of ALOS-2/PALSAR-2 data including flooded residential area before and after a flood, to confirm the validity of the proposed usage of the decomposition and the DoP.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130620330","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}
引用次数: 0
Validity of Stop-and-Go Approximation in High-Resolution Ku-band FMCW SAR with High-Velocity Platform 高速平台高分辨率ku波段FMCW SAR停走近似的有效性
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688527
Young-Geun Kang, Dae-Hwan Jung, Seong‐Ook Park
{"title":"Validity of Stop-and-Go Approximation in High-Resolution Ku-band FMCW SAR with High-Velocity Platform","authors":"Young-Geun Kang, Dae-Hwan Jung, Seong‐Ook Park","doi":"10.1109/APSAR52370.2021.9688527","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688527","url":null,"abstract":"In this study, the conditions under which “stop-and-go approximation” applies to FMCW SAR are analyzed. We analytically verified that the validity of stop-and-go approximation is generalized in Ku-band frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR). SAR processing time reduces without degrading the SAR image quality by applying stop-and-go approximation. Point target simulations are performed to provide quantitative results supporting the above argument.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129740471","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}
引用次数: 1
Investigation of the Effect of the Flight Path on the Three Dimensional Locatability of Targets 航迹对目标三维可定位性影响的研究
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688372
Fabian Hartmann, Jörn Ostermann
{"title":"Investigation of the Effect of the Flight Path on the Three Dimensional Locatability of Targets","authors":"Fabian Hartmann, Jörn Ostermann","doi":"10.1109/APSAR52370.2021.9688372","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688372","url":null,"abstract":"We analyse the 3-dimensional point spread functions of point sources reconstructed by the backprojection algorithm for different flight paths from data from a single channel without additional information. In this scenario, SAR-algorithms normally generate two dimensional images, because of large ambiguities in height, whereby the horizontal slices are mere copies of the slice at ground level. Our investigation focuses on the effect of the flight path on these ambiguities. For this purpose, we compute the simulated 3D pointspread function for several flight paths and compare them to those for a straight flight path. We analyze the volume data through slices parallel to the coordinate planes and a topological peak detection algorithm. For the non-straight flight paths, the location of the point target can be pinpointed in the set of slices parallel to each coordinate plane, but not for the straight flight path.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128418719","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}
引用次数: 0
Long-Term Pantropical Forest Monitoring with ALOS-2 L-Band SAR ALOS-2 l波段SAR对泛热带森林的长期监测
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688516
C. Koyama, Manabu Watanabe, M. Shimada, T. Tadono
{"title":"Long-Term Pantropical Forest Monitoring with ALOS-2 L-Band SAR","authors":"C. Koyama, Manabu Watanabe, M. Shimada, T. Tadono","doi":"10.1109/APSAR52370.2021.9688516","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688516","url":null,"abstract":"Seven years in orbit ALOS-2/PALSAR-2 has provided the world’s first long-term pantropical L-band forest observation archive. In the frame of the JICA-JAXA forest early warning system in the tropics (JJ-FAST), Japan’s SAR earth observation excellence has pioneered for a seamless and timely monitoring of the tropical forest belt from 2016 to 2021. In this paper, we discuss the tremendous contributions to fundamental SAR forest research, forest mapping, biomass estimation, and operational deforestation detection and demonstrate the merits of the unprecedented dense forest time-series for the entire tropical forest belt. As preparation for the coming “golden-age of L-band SAR”, we show examples of how ancillary precipitation information and machine learning can improve the monitoring and protection of tropical forests.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127527374","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}
引用次数: 0
PSInSAR Analysis of X-Band SAR Images for Detecting Urban Ground Deformation in Japan 日本城市地面形变x波段SAR影像的PSInSAR分析
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688365
Tomoya Kusunose, J. Susaki
{"title":"PSInSAR Analysis of X-Band SAR Images for Detecting Urban Ground Deformation in Japan","authors":"Tomoya Kusunose, J. Susaki","doi":"10.1109/APSAR52370.2021.9688365","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688365","url":null,"abstract":"Land subsidence, which used to be a serious social problem in Japan, is now under control due to groundwater pumping regulations enacted in the 1960s. However, while the groundwater level is recovering, new ground uplift problems are occurring mainly in urban areas. The risk of ground uplift disasters is a concern. In this paper, we apply a type of time-series SAR analysis “PSInSAR”, to X-band imagery, which is well suited for analysis in urban areas, to monitor areal ground deformation. The analysis showed that the RMSE is 1.1 [mm/year] compared with the level survey data, and it is suggested that the data can be supplemented in the temporal direction. In addition, we found that there is a strong correlation (R=0.74) between groundwater level rise and ground uplift.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123040659","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}
引用次数: 1
An Iterative Non-local Denoising Method of SAR Image Based on Multi-resolution 基于多分辨率的SAR图像迭代非局部去噪方法
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688378
He Huang, Penghui Huang, Xingzhao Liu, Fengwei Shao, Shaoqiang Li, Xin Lin
{"title":"An Iterative Non-local Denoising Method of SAR Image Based on Multi-resolution","authors":"He Huang, Penghui Huang, Xingzhao Liu, Fengwei Shao, Shaoqiang Li, Xin Lin","doi":"10.1109/APSAR52370.2021.9688378","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688378","url":null,"abstract":"Synthetic aperture radar (SAR) is an advanced remote sensor, which can observe the earth’s surface in all weather conditions, widely used in military reconnaissance and disaster rescue. However, due to the coherent summation of the return echoes and the random electromagnetic interference, a SAR image will be significantly affected by the noise, reducing the readability of the image. To deal with this issue, in this paper, we propose an iterative non-local denoising method based on multi-resolution. First, the cascade downsampling is performed to get the multi-resolution sub-images. Then, the 2-D discrete cosine transform is applied to each fragment segmented from the sub-images. After that, grouping the similar fragments by using the pHash algorithm. And the basic denoising image can be obtained by performing collaborative filtering and aggregating. Finally, a denoising image can be acquired after iterating processing. Real airborne SAR data is used to validate the effectiveness of the proposed method.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115903318","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}
引用次数: 0
Historical Paddy Rice Growth and Phenology Pattern Estimation Using Dual Polarization of Sentinel 1 基于哨兵1号双极化的历史水稻生长和物候模式估算
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688396
Choirunnisa Salsabila, M. F. Ghazali, A. Zaenudin
{"title":"Historical Paddy Rice Growth and Phenology Pattern Estimation Using Dual Polarization of Sentinel 1","authors":"Choirunnisa Salsabila, M. F. Ghazali, A. Zaenudin","doi":"10.1109/APSAR52370.2021.9688396","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688396","url":null,"abstract":"Availability of a good record of paddy rice growth condition is important for obtaining sustainable paddy rice production in agricultural countries like Indonesia. A multi-temporal of synthetic aperture radar (SAR) images of dual-polarization Sentinel-1 data collected from January 2020 to January 2021 are good enough to show the variation occurs in two or more regions in Lampung Province based on starting their cultivation time in the paddy field. This study provides the recommendation for detecting paddy rice phenology from two different approaches. Backscatter values (σ0) generated from VV, VH, VV/VH, and VV-VH and dual-polarization radar vegetation index (DpRVI) that has arranged to show the paddy rice growth and phenology pattern are compared with the observation directly from the field at a different time of cultivation period. Both patterns matching with the acquisition time of the direct observation has represented the similar pattern created by radar backscatter and dpRVI with an accuracy of about 85%. The characteristic of phenology and paddy rice growth pattern in the many regions in Lampung province is possible to detect using backscatter values and DpRVI.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127417734","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}
引用次数: 0
RFI Suppression Based on Azimuth Frequency Domain Notch for Low Frequency UWB SAR 低频UWB SAR中基于方位频域陷波的RFI抑制
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688470
Kang Liang, Hongtu Xie, N. Xie, Xingqiao Jiang, Kaipeng Chen, Guoqian Wang
{"title":"RFI Suppression Based on Azimuth Frequency Domain Notch for Low Frequency UWB SAR","authors":"Kang Liang, Hongtu Xie, N. Xie, Xingqiao Jiang, Kaipeng Chen, Guoqian Wang","doi":"10.1109/APSAR52370.2021.9688470","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688470","url":null,"abstract":"The low frequency ultra-wideband synthetic aperture radar (LF UWB SAR) is widely used in military and civil areas, because of its high-resolution imaging and strong penetration ability. Because the operation frequency of LF UWB SAR is in the same frequency band as radio, television and mobile communication signals, these radio frequency interference (RFI) signals are inevitably received by LF UWB SAR. RFI signals and target echo signals are mixed together, resulting in lines or noise in the imaging results, therefore seriously affect the detection ability and imaging quality of the LF UWB SAR. Although the traditional notch method is widely used in RFI suppression, its RFI suppression effect is poor. Moreover, the traditional notch method is only suitable for the suppression of narrowband RFI signals, but when the wideband RFI signal exists, the effect of RFI suppression is quite poor. But in practice, wideband RFI signal and narrowband RFI signal exist at the same time, so it is difficult to obtain ideal RFI suppression effect by using the traditional notch method. Based on the traditional notch method, an RFI suppression method based on azimuth frequency domain notch is proposed in this paper. Not only the proposed method can suppress narrowband RFI signal, but also it can obtain the great RFI suppression effect when there exists the wideband RFI signal. Experimental results show that the proposed RFI suppression method based on azimuth frequency domain notch has better RFI suppression effect than the traditional notch method when narrowband RFI signal and wideband RFI signal exist at the same time.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121707272","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}
引用次数: 0
Damage Extraction of the 2021 Off-Fukushima Earthquake based on PALSAR-2 Intensity Images 基于PALSAR-2烈度图像的2021年福岛近海地震损伤提取
2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR) Pub Date : 2021-11-01 DOI: 10.1109/APSAR52370.2021.9688379
F. Yamazaki, Wen Liu, Takanobu Suzuki
{"title":"Damage Extraction of the 2021 Off-Fukushima Earthquake based on PALSAR-2 Intensity Images","authors":"F. Yamazaki, Wen Liu, Takanobu Suzuki","doi":"10.1109/APSAR52370.2021.9688379","DOIUrl":"https://doi.org/10.1109/APSAR52370.2021.9688379","url":null,"abstract":"Remote sensing is useful to extract damages due to natural disasters. In this study, Synthetic Aperture Radar (SAR) images acquired from PALSAR-2 sensor onboard ALOS-2 satellite were used to observe damage situations due to the 13 February 2021 Off-Fukushima, Japan, earthquake. Landslides and rockfalls were reported at the Joban Expressway, a motor racing circuit, and seaside cliffs. Change detection using pre- and post-event PALSAR-2 intensity images was carried out and the results were compared with airborne optical images and field survey data. The landslide at the expressway and the motor circuit were recognized from the SAR intensity data, but rockfalls and other small-scale damages could not be identified due to the limitation of spatial resolution.","PeriodicalId":104561,"journal":{"name":"2021 7th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116517568","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}
引用次数: 0
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