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2021 2nd China International SAR Symposium (CISS)最新文献

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High-Orbit Synthetic Aperture Passive Positioning Method and Performance Analysis 高轨道合成孔径被动定位方法及性能分析
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652267
Yuqi Wang, Guangcai Sun, Zi-jing Zhang, M. Xing, Bowei Chen, Xuhong Feng
{"title":"High-Orbit Synthetic Aperture Passive Positioning Method and Performance Analysis","authors":"Yuqi Wang, Guangcai Sun, Zi-jing Zhang, M. Xing, Bowei Chen, Xuhong Feng","doi":"10.23919/CISS51089.2021.9652267","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652267","url":null,"abstract":"Aiming at the problem of passive positioning of fixed signal sources by high-orbit single satellites, this paper proposes a positioning method based on joint estimation of high-order modulation information. This method introduces the concept of high-orbit synthetic aperture radar imaging into high-orbit passive positioning. The matched filter is constructed, and the high-order modulation term of the received signal is estimated by the method of azimuth focusing and minimum entropy. In the geographic coordinate system, the cost function is directly constructed to search for the position of the signal source. On this basis, the orthogonality of the contours of higher-order terms is analyzed, and the ability of this method to locate signal sources at different locations is clarified. Theoretical derivation and simulation results verify the effectiveness of the positioning method.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126592276","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
Double-mode Integrated System for Observing Sea-surface Wind Field 海面风场观测双模集成系统
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652282
Hang Li, Wenkang Liu, Guangcai Sun, M. Xing, Zhenhua Zhang, J. Zhang
{"title":"Double-mode Integrated System for Observing Sea-surface Wind Field","authors":"Hang Li, Wenkang Liu, Guangcai Sun, M. Xing, Zhenhua Zhang, J. Zhang","doi":"10.23919/CISS51089.2021.9652282","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652282","url":null,"abstract":"Spaceborne SAR and scatterometer have their own advantages and weaknesses for measuring sea-surface wind field. The former can measure wind speed with high spatial resolution, but the accuracy is depended on the accuracy of external wind direction. The latter can obtain high-accuracy wind direction and speed simultaneously, but the spatial resolution is relatively low. This paper proposes a new system adopting a single digital antenna to integrate SAR and scatterometer to observe sea-surface wind field simultaneously based on multiple beamforming, and designs the joint time sequence of the transceiver. The proposed double-mode integrated system can not only improve observation accuracy of sea-surface wind field, but also expand observable areas.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125314301","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
Research on vgg16 convolutional neural network feature classification algorithm based on Transfer Learning 基于迁移学习的vgg16卷积神经网络特征分类算法研究
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652277
Jiahui Tao, Yuehan Gu, Jiazheng Sun, Yuxuan Bie, Hui Wang
{"title":"Research on vgg16 convolutional neural network feature classification algorithm based on Transfer Learning","authors":"Jiahui Tao, Yuehan Gu, Jiazheng Sun, Yuxuan Bie, Hui Wang","doi":"10.23919/CISS51089.2021.9652277","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652277","url":null,"abstract":"feature classification has broad development prospects in remote sensing applications. In order to accurately identify feature categories, this paper constructs a feature classification model with vgg16 neural network as the core network, and realizes the classification of water, farmland, buildings, roads and trees for light and small SAR images through in-depth learning route. Firstly, the algorithm constructs a new data set, and each picture in the data set is a feature category with labels. Secondly, the vgg-16 framework of deep convolution neural network on the new data set is built. According to the small scale of the data set, the pre training model obtained by migration learning is introduced, and the convolution layer of vgg16 network is locally adjusted according to the body characteristics and natural scenes of various ground objects, so as to optimize the main model parameters, so as to realize the prediction of water, farmland, buildings, roads Accurate classification of trees. The experimental results show that the average accuracy of vgg16 network without parameter adjustment can reach 75%, the average accuracy of vgg16 network after optimizing model parameters can reach 81%, and the average accuracy of feature classification after adding pre training model is 87.5%.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131607232","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: 8
Reverse Current Suppression Technology of Isolated SR Power Supply in Aerospace SAR 航天SAR中隔离式SR电源的反向电流抑制技术
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652221
Chao Wang, Peifei Wang, Ang Shen, Han Wang, Bangxing Wang, Ren Gui
{"title":"Reverse Current Suppression Technology of Isolated SR Power Supply in Aerospace SAR","authors":"Chao Wang, Peifei Wang, Ang Shen, Han Wang, Bangxing Wang, Ren Gui","doi":"10.23919/CISS51089.2021.9652221","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652221","url":null,"abstract":"The security, reliability and lifetime of synchronous-rectifier power supply are seriously affected by the reverse current phenomenon, especially for the isolated synchronous-rectifier power supply in aerospace SAR with large output capacitor array. A reverse current suppression technology suitable for isolated synchronous-rectifier power supply in aerospace SAR is designed. The output inductor current is sampled to control the driving signal of secondary MOSFET, which makes the secondary MOSFET to turn off before the output inductor current reverses. The simulation and experiment results indicated that the output voltage, by using this suppression method of reverse current, rises monotonously at power on with the output capacitor array charged. The reverse current problem can effectively solved by this suppression method, which has an important practical value for improving the performance of aerospace SAR.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134085065","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
Deformation detection performance analysis of SBAS-InSAR technique SBAS-InSAR技术变形检测性能分析
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652387
Q. Mao, Cheng Qian, Chaowei Zhou, Weiwei Ji, Yanlong Sun, B. Hu
{"title":"Deformation detection performance analysis of SBAS-InSAR technique","authors":"Q. Mao, Cheng Qian, Chaowei Zhou, Weiwei Ji, Yanlong Sun, B. Hu","doi":"10.23919/CISS51089.2021.9652387","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652387","url":null,"abstract":"SBAS-InSAR technology can extract the time deformation series of the surface by using the multi-navigation SAR data covering the same area, and a large number of research results show that the accuracy of linear deformation rate estimation can reach the magnitude of millimeter, the accuracy of DEM elevation measurement error estimation can reach the level of meter with SBAS-InSAR technology. However, the theoretical limit of specific estimation accuracy is not given clearly. To solve this problem, this paper derived the Cramer-Rao boundary of DEM elevation measurement error and linear deformation rate estimation in SBAS-InSAR technology through theoretical modeling, and quantitatively analyzed the impact of various non-ideal factors such as correlation coefficient, baseline distribution and residual atmospheric phase on the SBAS-InSAR deformation detection performance with Monte Carlo simulations.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130324187","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
Equivalent Test and Verification of Interferometric Imaging Altimeter 干涉成像高度计的等效测试与验证
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652317
Jun Gong, Jinqiang Zhang, Hulin Lu, Qinchao Wang, Jian Tu, C. Fu
{"title":"Equivalent Test and Verification of Interferometric Imaging Altimeter","authors":"Jun Gong, Jinqiang Zhang, Hulin Lu, Qinchao Wang, Jian Tu, C. Fu","doi":"10.23919/CISS51089.2021.9652317","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652317","url":null,"abstract":"Interferometric imaging altimeter is a kind of satellite-borne ocean remote sensing equipment which adopts interferometric system. It has the advantages of high resolution and high precision in sea surface height measurement, so as to realize the small and medium scale observation, fine observation and near shore observation of the ocean. In order to verify the effectiveness of the satellite-borne scheme, the flight experimentation can be used for equivalent verification. In terms of working conditions, there are differences in altitude and speed between airborne and satellite-borne. In this paper, the equivalence analysis and design are carried out from the aspects of working principle, prototype development and ground test verification, so as to realize the effective verification of the satellite-borne scheme.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117333697","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
Research on Design Method of 220G Waveguide Antenna Based on MEMS Technology 基于MEMS技术的220G波导天线设计方法研究
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652391
Jiahe Mei, Sili Wu, Hui Wang, Zhaoyang Zeng, Xiang Chen, Yulong Fu
{"title":"Research on Design Method of 220G Waveguide Antenna Based on MEMS Technology","authors":"Jiahe Mei, Sili Wu, Hui Wang, Zhaoyang Zeng, Xiang Chen, Yulong Fu","doi":"10.23919/CISS51089.2021.9652391","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652391","url":null,"abstract":"The research of millimeter wave waveguide antenna array is urgently needed by the country, but due to the limitation of insufficient processing precision of traditional processing technology, there are still some problems in the realization of large millimeter wave waveguide antenna array, which affects the national scientific and technological progress and the country’s economic development. Aiming at the realization of the large millimeter wave waveguide antenna array, this paper takes 220GHz waveguide antenna array as the research object, combining the MEMS technology that can achieve micron-level processing accuracy with the design of 220GHz waveguide antenna array, and determines the 220GHz waveguide antenna array based on MEMS technology. The design method of 220GHz antenna is simulated by HFSS. The designed 220GHz antenna has a bandwidth of 210GHz~220GHz, a gain of 31dB, a standing wave lower than 1.8, and good electrical performance. Through research, this article reveals a new implementation method for millimeter wave waveguide antenna arrays, realizes the high gain design of millimeter wave waveguide antenna arrays, and establishes a complete set of millimeter wave waveguide antenna array implementation processes, which will provide a better solution for future millimeter wave waveguide antenna arrays. The research on large arrays of waveguide antennas has laid the foundation and provided a new idea for the design of large arrays of millimeter wave waveguide antennas.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115805847","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
A Low-Slow-Small Target Detection Method for Offshore Radar Based on GPU 基于GPU的海上雷达低慢小目标检测方法
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652263
K. Guo, Xin Zheng, Shuhai Shi, Kaili Qin, Tingyao Xie
{"title":"A Low-Slow-Small Target Detection Method for Offshore Radar Based on GPU","authors":"K. Guo, Xin Zheng, Shuhai Shi, Kaili Qin, Tingyao Xie","doi":"10.23919/CISS51089.2021.9652263","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652263","url":null,"abstract":"In recent years, the detection of low-slow-small targets by offshore radar has become a key issue to be solved urgently. This paper analyzes the echo characteristics of the sea clutter and the target, by extracting the features of the target and sea clutter, the feature detector is used to realize the classification of the target and the clutter, and then extract the target information. In addition, the method in this paper is implemented by GPU to increase the computing speed. The method in this paper is verified by the measured data of a Ku-band offshore radar. It has a higher detection capability than traditional CFAR, and the GPU processing speed meets engineering requirements, realizing the real-time detection of the target by the radar.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126450825","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
Application of flexible degradation technology to Phased-array Antenna 柔性退化技术在相控阵天线中的应用
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652350
Jingjing Yang, Hongying Zhang, Hanbing Luo, Xiaowei Shen, Z. Mo
{"title":"Application of flexible degradation technology to Phased-array Antenna","authors":"Jingjing Yang, Hongying Zhang, Hanbing Luo, Xiaowei Shen, Z. Mo","doi":"10.23919/CISS51089.2021.9652350","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652350","url":null,"abstract":"This paper discussed the application of flexible degradation technology to phased-array antennain relay terminal. The phased-array antenna mainly includes beam-controller, antenna array and transmitter module (T module). The phased-array antenna receives modulated RF signal, realizes the synthesis and direction change of the transmitting beam, through the amplification of T module, and finally radiates thepowersignal from the terminalantenna. This designgreatly increases the efficiency and reliability of the system. Even if one ofthebranchesisabnormal, thesystemcan still work. The flexible degradation technology can significantly improve the reliability, maintainability and survivability of the phased-array antenna.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"73 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131485379","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
Design of a Heterogeneous Simulation Platform for Spaceborne SAR Echo Signal Based on FPGA 基于FPGA的星载SAR回波信号异构仿真平台设计
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652354
Jiangtao Xu, Liang Hu, Wei Yang, Fei Zou
{"title":"Design of a Heterogeneous Simulation Platform for Spaceborne SAR Echo Signal Based on FPGA","authors":"Jiangtao Xu, Liang Hu, Wei Yang, Fei Zou","doi":"10.23919/CISS51089.2021.9652354","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652354","url":null,"abstract":"Due to the high cost of actual data acquisition, the simulation of the original echo signal of spaceborne SAR is of great significance. With the increasing requirements of high resolution and wide swath, the number of simulation points for distributed scenes is huge and the echo simulation is time-consuming. To improve the simulation efficiency, a heterogeneous simulation platform architecture with a Field Programmable Gate Array (FPGA) was proposed in this paper. The range frequency domain pulse coherence (RFPC) method is used as the basic simulation algorithm and the FPGA parallel calculation is used to improve the simulation efficiency. The platform adopts the joint design method of Verilog and C language and the method of software and hardware co-design. High-efficiency data transmission between the host computer and FPGA is realized in the way of Gigabit Ethernet optical communication. The communication overhead is much smaller than the saved computational overhead. The test results verify the effectiveness of the scheme.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"1 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121919836","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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