Pub Date : 2019-11-01DOI: 10.1109/APSAR46974.2019.9048396
Lulu Tan, Yan Wang, Lei Sheng
Due to its all-weather, day and night imaging capability, Synthetic Aperture Radar (SAR) is playing a very important role in earth observation. Satellites loaded with SAR payload are widely used in military and civilian applications due to its high resolution, wide swath imaging and global coverage capabilities. However, the applilcation of SAR satellites is severely restricted by its costs and weights. In this paper, a low-cost payload platform integrated SAR system with high resolution is proposed. The instruments of the system is described and the performance of the system is illustrated.
{"title":"A high performance low-cost SAR system loaded on small satellite platform","authors":"Lulu Tan, Yan Wang, Lei Sheng","doi":"10.1109/APSAR46974.2019.9048396","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048396","url":null,"abstract":"Due to its all-weather, day and night imaging capability, Synthetic Aperture Radar (SAR) is playing a very important role in earth observation. Satellites loaded with SAR payload are widely used in military and civilian applications due to its high resolution, wide swath imaging and global coverage capabilities. However, the applilcation of SAR satellites is severely restricted by its costs and weights. In this paper, a low-cost payload platform integrated SAR system with high resolution is proposed. The instruments of the system is described and the performance of the system is illustrated.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"72 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":"133217837","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/APSAR46974.2019.9048554
Zhan Zhenxian, Xu Tanghong, Huang Shuaishuai
A Ku-band broadband waveguide wide side longitudinal slot antenna array for unmanned aerial vehicle (UAV) SAR application is designed. A single-ridge is employed to reduce the sectional size of the waveguide, and to achieve wide scanning ability. The bandwidth of the antenna is expanded by the single-ridge and subarea feeding of the slots. The active admittance of the waveguide slot is extracted based on the simulation using the HFSS software, in order to determine the size parameters of the waveguide slots. The simulation mode is built and the size parameters of the waveguide slots are modified and optimized by the aperture distribution re-deducing method. This design method has high efficiency and high veracity. An antenna array of 72 waveguide slot antenna lines is designed and manufactured. The measured results show that the relative bandwidth of VSWR smaller than 2 is 15%. The measured patterns show that the side lobe is smaller than −21.5dB, the cross polarization is better than −40dB, and the scanning angle is ±60° in azimuth direction. This waveguide slot antenna array has many advantages such as wide band, wide scanning, low side lobe and compact structure, and is suitable for UAV SAR application.
{"title":"A Ku-band Broadband Single-Ridge Waveguide Slot Antenna Array for UAV SAR Application","authors":"Zhan Zhenxian, Xu Tanghong, Huang Shuaishuai","doi":"10.1109/APSAR46974.2019.9048554","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048554","url":null,"abstract":"A Ku-band broadband waveguide wide side longitudinal slot antenna array for unmanned aerial vehicle (UAV) SAR application is designed. A single-ridge is employed to reduce the sectional size of the waveguide, and to achieve wide scanning ability. The bandwidth of the antenna is expanded by the single-ridge and subarea feeding of the slots. The active admittance of the waveguide slot is extracted based on the simulation using the HFSS software, in order to determine the size parameters of the waveguide slots. The simulation mode is built and the size parameters of the waveguide slots are modified and optimized by the aperture distribution re-deducing method. This design method has high efficiency and high veracity. An antenna array of 72 waveguide slot antenna lines is designed and manufactured. The measured results show that the relative bandwidth of VSWR smaller than 2 is 15%. The measured patterns show that the side lobe is smaller than −21.5dB, the cross polarization is better than −40dB, and the scanning angle is ±60° in azimuth direction. This waveguide slot antenna array has many advantages such as wide band, wide scanning, low side lobe and compact structure, and is suitable for UAV SAR application.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"8 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":"133029487","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/APSAR46974.2019.9048430
Xinlin Jia, Hongjun Song
Wide area surveillance ground moving target indication (WAS-GMTI) is an important mode of multichannel airborne radar. Space-time adaptive processing (STAP) is widely used in WAS-GMTI clutter suppression. However, it will be difficult to estimate the clutter plus noise spectral density matrix accurately when the training samples are contaminated by moving targets. In this paper, target-free training samples obtained via robust principal component analysis (RPCA) algorithm are used for more accurate clutter plus noise spectral density matrix estimation. An eigenvector subspace projection method is used to calculate the filter vector. The simulation results show the advantages of the proposed method.
广域监视地面运动目标指示是多通道机载雷达的一种重要模式。空时自适应处理(STAP)广泛应用于WAS-GMTI杂波抑制中。然而，当训练样本被运动目标污染时，杂波加噪声谱密度矩阵难以准确估计。本文利用鲁棒主成分分析(robust principal component analysis, RPCA)算法得到的无目标训练样本，进行更精确的杂波加噪声谱密度矩阵估计。采用特征向量子空间投影法计算滤波向量。仿真结果表明了该方法的优越性。
{"title":"Clutter suppression for multichannel wide area surveillance system via a combination of STAP and RPCA","authors":"Xinlin Jia, Hongjun Song","doi":"10.1109/APSAR46974.2019.9048430","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048430","url":null,"abstract":"Wide area surveillance ground moving target indication (WAS-GMTI) is an important mode of multichannel airborne radar. Space-time adaptive processing (STAP) is widely used in WAS-GMTI clutter suppression. However, it will be difficult to estimate the clutter plus noise spectral density matrix accurately when the training samples are contaminated by moving targets. In this paper, target-free training samples obtained via robust principal component analysis (RPCA) algorithm are used for more accurate clutter plus noise spectral density matrix estimation. An eigenvector subspace projection method is used to calculate the filter vector. The simulation results show the advantages of the proposed method.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"46 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":"132293876","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/APSAR46974.2019.9048326
Xiao Jing, Yiran Guo
With the development of digital signal processing and synthetic aperture radar (SAR) imaging algorithms, high-resolution and quick real-time imaging of SAR is required higher and higher. In this paper, the multicore digital signal processor multicore DSP is used to design the spotlight imaging system. The task division and optimization design of each processing node on the board are described in detail, and an online test method based on pseudo-random number is proposed. Real-time processing image is obtained on airborne platform, which verified the feasibility and effectiveness of the imaging system.
{"title":"Design of Spotlight SAR Imaging System based on Multicore DSP","authors":"Xiao Jing, Yiran Guo","doi":"10.1109/APSAR46974.2019.9048326","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048326","url":null,"abstract":"With the development of digital signal processing and synthetic aperture radar (SAR) imaging algorithms, high-resolution and quick real-time imaging of SAR is required higher and higher. In this paper, the multicore digital signal processor multicore DSP is used to design the spotlight imaging system. The task division and optimization design of each processing node on the board are described in detail, and an online test method based on pseudo-random number is proposed. Real-time processing image is obtained on airborne platform, which verified the feasibility and effectiveness of the imaging system.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"143 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":"131797839","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/APSAR46974.2019.9048510
Shi-hong Du, Minmin Lan, Kaizhi Wang
The paper analyzes height measurement of small target based on dual-receive channel radar, use the interference phase by the distance between target and two receiving antennas to obtain the target height. At last, the performance of the radar is analyzed in detail, and some conclusions are obtained through experiments.
{"title":"Height Measurement of Small Target with Dual-Receive Channel Radar","authors":"Shi-hong Du, Minmin Lan, Kaizhi Wang","doi":"10.1109/APSAR46974.2019.9048510","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048510","url":null,"abstract":"The paper analyzes height measurement of small target based on dual-receive channel radar, use the interference phase by the distance between target and two receiving antennas to obtain the target height. At last, the performance of the radar is analyzed in detail, and some conclusions are obtained through experiments.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"2 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":"132912911","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/APSAR46974.2019.9048319
Wenguang Xiao, Yanhua Li, Baidong Yao
Aiming at the problems of unconformity, poor versatility and difficult maintenance of existing radar information processing systems, this paper proposes a new scheme for airborne radar information processing system based on open architecture. Supported by OpenVPX bus and SRIO switching technology, the high-speed parallel processing of radar signals is realized by spot digital boards integrated with high-performance DSP and FPGA. The single-channel communication bandwidth reaches 10Gbps, and the communication bandwidth of adjacent modules reaches 80Gbps. The test results show that it only takes 12.8s to complete $16mathrm{K}^{ast}16mathrm{K}$ complex image processing. The spot standard board facilitates function reconstruction and maintenance support, meeting the design requirements.
{"title":"Research on Radar Information Processing System Based on Open Architecture","authors":"Wenguang Xiao, Yanhua Li, Baidong Yao","doi":"10.1109/APSAR46974.2019.9048319","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048319","url":null,"abstract":"Aiming at the problems of unconformity, poor versatility and difficult maintenance of existing radar information processing systems, this paper proposes a new scheme for airborne radar information processing system based on open architecture. Supported by OpenVPX bus and SRIO switching technology, the high-speed parallel processing of radar signals is realized by spot digital boards integrated with high-performance DSP and FPGA. The single-channel communication bandwidth reaches 10Gbps, and the communication bandwidth of adjacent modules reaches 80Gbps. The test results show that it only takes 12.8s to complete $16mathrm{K}^{ast}16mathrm{K}$ complex image processing. The spot standard board facilitates function reconstruction and maintenance support, meeting the design requirements.","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":"132668258","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/apsar46974.2019.9048437
L. Yun, Cui Junbo, Zhang Wangfei
Forest aboveground biomass the result accumulated in the long-term production and metabolism of forest ecosystem, and accurate estimation of forest overground biomass is an important basic work for the carbon cycle of forest ecosystem. In this paper, the study area is situated in Gen he and base on muti-source data, It is used of the RF algorithm to sort and select features from various data sources, Then use KNN-FIFS algorithm to analyze different feature combinations, and finally invert the forest biomass and evaluate the inversion accuracy. In this study, forest biomass results estimated with polarization decomposition information from L-band PALSAR data are the most accurate, with the $mathrm{R}^{2} =0.63$ and $text{RMSE} =28.84 mathrm{t}/text{ha}$.
{"title":"Forest biomass inversion based on multi-source data parameter optimization","authors":"L. Yun, Cui Junbo, Zhang Wangfei","doi":"10.1109/apsar46974.2019.9048437","DOIUrl":"https://doi.org/10.1109/apsar46974.2019.9048437","url":null,"abstract":"Forest aboveground biomass the result accumulated in the long-term production and metabolism of forest ecosystem, and accurate estimation of forest overground biomass is an important basic work for the carbon cycle of forest ecosystem. In this paper, the study area is situated in Gen he and base on muti-source data, It is used of the RF algorithm to sort and select features from various data sources, Then use KNN-FIFS algorithm to analyze different feature combinations, and finally invert the forest biomass and evaluate the inversion accuracy. In this study, forest biomass results estimated with polarization decomposition information from L-band PALSAR data are the most accurate, with the $mathrm{R}^{2} =0.63$ and $text{RMSE} =28.84 mathrm{t}/text{ha}$.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"115 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":"133565400","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/APSAR46974.2019.9048530
W. Dong, Hanwei Sun
Aiming at the error factors affecting the measurement accuracy of interferometric imaging altimeter, the error simulation method in this paper is carried out from the angle of wavenumber spectrum. The principle and process of simulation are given in this paper. And the main errors affecting the accuracy of measurement are analyzed and simulated which include: baseline inclination error, baseline length error, random noise error, sea state bias, dry tropospheric delay error, wet tropospheric delay error, ionospheric delay error, etc.
{"title":"Error Simulation Method of Interferometric Imaging Altimeter Based on Wavenumber Spectrum Analysis","authors":"W. Dong, Hanwei Sun","doi":"10.1109/APSAR46974.2019.9048530","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048530","url":null,"abstract":"Aiming at the error factors affecting the measurement accuracy of interferometric imaging altimeter, the error simulation method in this paper is carried out from the angle of wavenumber spectrum. The principle and process of simulation are given in this paper. And the main errors affecting the accuracy of measurement are analyzed and simulated which include: baseline inclination error, baseline length error, random noise error, sea state bias, dry tropospheric delay error, wet tropospheric delay error, ionospheric delay error, etc.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"44 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":"116069617","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}
Multi-input and multi-output SAR (MIMO-SAR) processing technique is the important development trend of the next-generation spaceborne SAR imaging system, due to the ability of achieving high resolution and large swath width (HRWS) imaging by exploiting more spatial degrees of freedom via adding multiple transmission channels. Considering that multichannel MIMO-SAR signal is nonuniformly sampled and most of the conventional reconstruction algorithms are time-consuming due to the matrix inversion or the eigenvalue decomposition, this paper proposes a fast nonuniform signal reconstruction algorithm based on filterbank framework theory, which combines the non-uniform signal reconstruction theory with a bank of filters to resolve the azimuth ambiguity by the point multiplication operation. Simulated processing results are used to validate the effectiveness of the proposed method.
{"title":"A Novel Multi-channel High-Resolution Imaging Method for MIMO-SAR System Based on Filterbank Framework Reconstruction Theory","authors":"Lingyu Wang, Penghui Huang, Xingzhao Liu, Robert Wang, Yanyang Liu, Huajian Xu","doi":"10.1109/APSAR46974.2019.9048532","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048532","url":null,"abstract":"Multi-input and multi-output SAR (MIMO-SAR) processing technique is the important development trend of the next-generation spaceborne SAR imaging system, due to the ability of achieving high resolution and large swath width (HRWS) imaging by exploiting more spatial degrees of freedom via adding multiple transmission channels. Considering that multichannel MIMO-SAR signal is nonuniformly sampled and most of the conventional reconstruction algorithms are time-consuming due to the matrix inversion or the eigenvalue decomposition, this paper proposes a fast nonuniform signal reconstruction algorithm based on filterbank framework theory, which combines the non-uniform signal reconstruction theory with a bank of filters to resolve the azimuth ambiguity by the point multiplication operation. Simulated 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":"76 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":"114770494","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/APSAR46974.2019.9048409
Moxin Zhao, Yunhua Zhang, Dong Li
This paper proposes a method to improve the contrast between ship wake and background in radar image so as to better detect the ship wake. The method is based on the white top-hat transformation with the structuring element determined by the edge orientation. By applying the white top-hat transformation on each submatrix, the contrast can be improved, which is good for detecting the location of wake in the Radon domain. The radar image containing ship wake from the TG-2 interferometric imaging radar altimeter (InIRA) is processed to test the method, and the results validate the algorithm very well.
{"title":"A novel ship wake detection method based on white top-hat transformation","authors":"Moxin Zhao, Yunhua Zhang, Dong Li","doi":"10.1109/APSAR46974.2019.9048409","DOIUrl":"https://doi.org/10.1109/APSAR46974.2019.9048409","url":null,"abstract":"This paper proposes a method to improve the contrast between ship wake and background in radar image so as to better detect the ship wake. The method is based on the white top-hat transformation with the structuring element determined by the edge orientation. By applying the white top-hat transformation on each submatrix, the contrast can be improved, which is good for detecting the location of wake in the Radon domain. The radar image containing ship wake from the TG-2 interferometric imaging radar altimeter (InIRA) is processed to test the method, and the results validate the algorithm very well.","PeriodicalId":377019,"journal":{"name":"2019 6th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)","volume":"46 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":"115887648","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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