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

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An FPGA Implementation of UAV SAR Real-time Imaging Algorithm 无人机SAR实时成像算法的FPGA实现
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652219
Jiaqi Pan, Zhaoyang Zeng, Hui Wang, Wei Hua, Sili Wu
{"title":"An FPGA Implementation of UAV SAR Real-time Imaging Algorithm","authors":"Jiaqi Pan, Zhaoyang Zeng, Hui Wang, Wei Hua, Sili Wu","doi":"10.23919/CISS51089.2021.9652219","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652219","url":null,"abstract":"This paper puts forward a valid method to design the Unmanned Aerial Vehicle (UAV) Synthetic Aperture Radar (SAR) real-time imaging processor based on FPGA, a block-wise Phase Gradient Autofocus (PGA)[4],[5] is used to correct the space-variant phase error. The architecture of this processor designs with both fixed point operation and floating point operation to reduce hardware resource, also designs with both pipeline process and parallel process to reduce process time. Experiment results show that system works at 100MHz can process 512MB SAR raw data within about 8 seconds. The good experimental image also proves the validity and reliability of the proposed system.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"64 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":"122067026","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
Implementation of Range Migration Correction of Air-borne SAR Based on Two Multi-core DSPs 基于两个多核dsp的机载SAR距离偏移校正实现
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652377
Panhu Li, Ge Wang, Q. Lu, Qingqing Li, Yi Chen
{"title":"Implementation of Range Migration Correction of Air-borne SAR Based on Two Multi-core DSPs","authors":"Panhu Li, Ge Wang, Q. Lu, Qingqing Li, Yi Chen","doi":"10.23919/CISS51089.2021.9652377","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652377","url":null,"abstract":"In this paper, we propose an implementation method of range migration correction under the multi-chip and multi-core DSP architecture. Firstly, the technology involved in the implementation process is given. Then the implementation algorithm is described in detail. Experiments have proved the effectiveness of the algorithm.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"29 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":"123604815","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
Building Monitoring Method based On Interferometric SAR Shadow 基于干涉SAR阴影的建筑物监测方法
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652373
Sili Wu, Xiao-juan Huang, Jiazheng Sun, Hui Wang
{"title":"Building Monitoring Method based On Interferometric SAR Shadow","authors":"Sili Wu, Xiao-juan Huang, Jiazheng Sun, Hui Wang","doi":"10.23919/CISS51089.2021.9652373","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652373","url":null,"abstract":"Object-oriented data products are the ultimate goal of space-based SAR systems, and they are also a direct element that affects user information decision-making. The following work is based on the SAR imaging and the extraction of interferometric information, starting from the features of the shadow area in the SAR image/interferometric phase, studying the shadow application of millimeter wave SAR images based on the principle of synthetic aperture radar, achieving feature extraction and object-oriented parameter output.","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":"124393619","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
Dual-Mode Interferometric Experiment Using Ka DBF-SAR Ka DBF-SAR双模干涉实验
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652204
Hui Wang, Sili Wu, Shichao Zheng
{"title":"Dual-Mode Interferometric Experiment Using Ka DBF-SAR","authors":"Hui Wang, Sili Wu, Shichao Zheng","doi":"10.23919/CISS51089.2021.9652204","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652204","url":null,"abstract":"Ka-band DBF-SAR can achieve system integration in a light and small way. It can acquire along-track and across-track multi-channel data in one observation. Ka band SAR system have the characteristics of rich details and fine texture representation by its shorter wavelength. It has the advantages of observing metal structure, target shadow and other key target characteristics. Airborne experiments and offline signal processing were taken. Mission highlights includes multi-channel imaging in elevation and dual-mode InSAR. Interferometric information of height and velocity are extracted by the effective baseline in the range and azimuth respectively.","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":"127591198","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
Geolocation analysis for near-space synthetic aperture radar based on Rang-Doppler model 基于距离-多普勒模型的近空间合成孔径雷达地理定位分析
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652232
Xueyun Wei, Biao Jin, Guo Jiao, Caiping Xi, Wei Zheng
{"title":"Geolocation analysis for near-space synthetic aperture radar based on Rang-Doppler model","authors":"Xueyun Wei, Biao Jin, Guo Jiao, Caiping Xi, Wei Zheng","doi":"10.23919/CISS51089.2021.9652232","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652232","url":null,"abstract":"Near-space has important strategic significance in both military and civil fields, and it has become a research hotspot. Synthetic aperture radar has the ability of high-resolution imaging in all-weather, all-time and all-weather, which is especially suitable for monitoring in near-space. Precise geolocation is an important preprocessing step for SAR image rectification and application. For near-space, the curvature of the Earth cannot be ignored, and the Range-Doppler model is the preferred method for synthetic aperture radar geolocation. The target position is obtained by solving the Doppler equation, the slant range equation and the modified earth model equation. This paper analyzes the influence of geolocation accuracy for near-space synthetic aperture radar. Firstly, the calculation formulas of the location uncertainty are derived, and then the simulation process and some typical results are given according to the formulas.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"77 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":"127259269","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
Parallel implementation of real-time ISAR imaging based on graphics processing units 基于图形处理单元的实时ISAR成像并行实现
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652329
Cheng Qian, Q. Mao, Zelong Shao, Yanlong Sun, Y. Quan, M. Xing
{"title":"Parallel implementation of real-time ISAR imaging based on graphics processing units","authors":"Cheng Qian, Q. Mao, Zelong Shao, Yanlong Sun, Y. Quan, M. Xing","doi":"10.23919/CISS51089.2021.9652329","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652329","url":null,"abstract":"Inverse Synthetic aperture radar imaging is widely utilized in many fields. But high resolution ISAR imaging of maneuvering targets is challenging due to its complexity during long coherence processing interval (CPI). So the ISAR imaging of maneuvering targets needs to be processed in short CPI. The resolution in cross-range is inversely proportional to the synthesized aperture length. So the RD imaging is blurred in short CPI. Compressive sensing (CS) theory indicates that it is possible to obtain precise recovery of a sparse signal from very limited measurements, which can improve imaging resolution of short aperture. But the CS results in a high computational complexity. Therefore, the high computational complexity of CS is a major concern for its implementation to achieve real-time reconstruction of compressively sensed signals. One of recovery algorithms for CS is the orthogonal matching pursuit (OMP), which involves massive matrix/vector operations. The OMP algorithm is very suits to be implemented in parallel on Graphics processing units (GPU) platform to accelerate the computation. The traditional GPU board has large size and high power consumption, which limits its application in the field of radar signal processing. In this paper, a real-time ISAR imaging conceptive is presented based on embedded GPU platform. Experiment results show that we can apply the CS imaging to achieve higher resolution than RD imaging in the case of short CPI. What’s more, remarkable speedup is achieved by our implementation of OMP on embedded GPU than CPU.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"26 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":"131721207","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 Generation and Pre-distortion of high-frequency and wide-band signal based on FPGA/DA 基于FPGA/DA的高频宽带信号生成及预失真研究
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652253
Wei Li, Hui Wang, Sili Wu, Zhaoyang Zeng, Xiang Chen, Yulong Fu
{"title":"Research on Generation and Pre-distortion of high-frequency and wide-band signal based on FPGA/DA","authors":"Wei Li, Hui Wang, Sili Wu, Zhaoyang Zeng, Xiang Chen, Yulong Fu","doi":"10.23919/CISS51089.2021.9652253","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652253","url":null,"abstract":"In practical radar systems, amplitude and phase distortion exists in antenna channels, which has a bad effect on subsequent signal processing. So waveform generator is needed to launch signals covering radar waveband to make a channel test. Ensuring accuracy and bandwidth of the waveform generator is a fundamental requirement. Accordingly, this paper proposed a full flow of wideband waveform generation, including hardware design, parameter selection and pre-distortion correction. Direct digital waveform synthesize (DDWS) is done in the first, second, or third Nyquist region without analog frequency conversion, ensuring the quality of the waveform and pre-distortion measures are taken to correct the waveform reconstruction error. This paper presents an advanced generation method of wide-band LFM signal based on waveform storage method and introduces the theory of pre-distortion. Using only one high speed FPGA/DA as the control-unit to replace the way of using DSP+FPGA makes the system structure much easier. It can generate any kind of LFM signal, which has wide band. By using the pre-distortion technique, the phase and amplitude error of the LFM signal is less than 1 degree and its flatness is less than 0.5dB.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"51 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":"123600553","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
Robust Adaptive Pulse Compression for Synthetic Aperture Radar 合成孔径雷达鲁棒自适应脉冲压缩
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652348
Q. Lu, Wenming Tang, Qingqing Li, Bingqi Zhu, K. Du, Xiangzhen Yu
{"title":"Robust Adaptive Pulse Compression for Synthetic Aperture Radar","authors":"Q. Lu, Wenming Tang, Qingqing Li, Bingqi Zhu, K. Du, Xiangzhen Yu","doi":"10.23919/CISS51089.2021.9652348","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652348","url":null,"abstract":"Traditional matched filter is created based on the maximum output signal-noise-ratio (SNR) via the temporal conjugate reverse of the transmitted signal. However, matched filter treats every sampling point in the same way and results in strong targets covering the neighboring weak targets for their high-level side lobes. To mitigate the masking influence, an adaptive pulse compression (APC) was developed via updating the filter’s tap coefficients for each output point. Unfortunately, intolerable processing time blocks the wide use of APC. In this paper, a fast implementation named iterative adaptive pulse compression (IAPC), is proposed whereby the respective tap coefficients of all filters are jointly updated with a recursive way and subsequently we incorporate it into the classic range Doppler algorithm via changing the processing sequence. Moreover, an encoder-decoder convolutional neural network (CNN) is developed for boosting the targets’ levels with taking into account IAPC severely being influenced by SNR. As a result, through a variety of stressing experiments, the proposed method is shown to be superior to the original APC and matched filter in the views of time efficiency and peak sidelobe ratio respectively.","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":"123837233","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
SAR and Infrared Image Fusion based on Latent Low-rank Representation 基于潜在低秩表示的SAR与红外图像融合
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652254
Cong Li, Meng Cai, P. Xu, Yi Liang
{"title":"SAR and Infrared Image Fusion based on Latent Low-rank Representation","authors":"Cong Li, Meng Cai, P. Xu, Yi Liang","doi":"10.23919/CISS51089.2021.9652254","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652254","url":null,"abstract":"To solve the problems of image information loss and spectral distortion during the fusion of SAR and infrared images, this paper proposes a SAR and infrared image fusion method based on Latent Low-Rank Representation (LatLRR). First, the method uses Non-Subsampled Contourlet Transform (NSCT) to obtain the low-frequency and high-frequency information of the source image. Then, the low-frequency information determines the fusion weight of the low-frequency part and the high-frequency uses LatLRR to extract low-rank components for adaptive weighted fusion. Finally, uses inverse NSCT transformation on the fusion coefficients to obtain the fusion image. Compared with other typical fusion methods, the proposed method has better visual effects, and the objective evaluation parameter values are also improved.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"44 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":"125531294","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
Modeling analysis and Design of Battery Chargers for Micro-nano SAR Satellites 微纳SAR卫星电池充电器的建模分析与设计
2021 2nd China International SAR Symposium (CISS) Pub Date : 2021-11-03 DOI: 10.23919/CISS51089.2021.9652208
Naiming Chen, Qiang Li, Pengfei Cui, F. Guo, F. Yang, Jun Xu, Hua Yang
{"title":"Modeling analysis and Design of Battery Chargers for Micro-nano SAR Satellites","authors":"Naiming Chen, Qiang Li, Pengfei Cui, F. Guo, F. Yang, Jun Xu, Hua Yang","doi":"10.23919/CISS51089.2021.9652208","DOIUrl":"https://doi.org/10.23919/CISS51089.2021.9652208","url":null,"abstract":"With the development of modern commercial satellites, the micro-nano SAR satellites with low-cost, light-weight, multi-functional, and highly-integrated features are ushering lately. Due to short working time and high peak power of SAR loads, a set of high-voltage load batteries must be specially configured for SAR loads, supplying larger power with the same current. This paper proposes an isolated boost converter with a push-pull topology for constant current and constant voltage charging of the lithium batteries, and the charger converter uses a dual-loop control strategy of peak current control method to achieve constant current and constant voltage charging performance. The AC small signal equivalent model of the converter is established. Finally, the experimental verification is carried out on the charger prototype. The experimental results verify the correctness of the analysis and the validity of the design, which can meet the requirements of SAR load battery charging.","PeriodicalId":318218,"journal":{"name":"2021 2nd China International SAR Symposium (CISS)","volume":"32 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":"117139198","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
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