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2017 International Conference on Radar Systems, Radar 2017

作者： Wang, Zhen Yang, Yanjiao Ding, Zegang Lin, Sheng Zhang, Tianyi Lv, Zheng Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Spacecraft System Engineering CAST Beijing100094 China

ISBN: (纸本)9781785615153

For the image registration of interferometric SAR, there is a contradiction between the registration accuracy and the robustness based on the traditional cross correlation and spectral diversity methods. To eliminate the contradiction, this paper proposes an image registration strategy combined with the respective advantages of above two methods. Its improvements are summarized as follows. Firstly, it divides the image registration process into two main steps. Step one is oriented to the image registration in the range direction based on cross correlation to enhance the robustness. Step two is oriented to the image registration in the azimuth direction based on spectral diversity to ensure the registration accuracy. Secondly, a method for detecting and correcting the singular values in the range pixels offsets is proposed in step one. It can reduce the impact of low-correlation regions. Finally, a hybrid filtering method is introduced for the azimuth pixels offsets in step two to reduce the impact of phase noise. Airborne dual-antenna data are employed to validate the effectiveness of the proposed strategy. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Interferometry

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Feasibility study of inclined geosynchronous SAR focusing using Beidou IGSO signals

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Science China Earth Sciences 2016年第12期59卷 240-242页

作者： Xichao DONG Cheng HU Weiming TIAN Tian ZHANG Yuanhao LI Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

Dear editor,Geosynchronous synthetic aperture radar(GEO SAR)[1,2]has an inclined geosynchronous orbit of around 36000 km,which leads to its short revisit time of around 24 hours and a wide coverage of up to approximately one third of the Earth *** long integration time guarantees the fine ***,GEO SAR owns the promising capability of providing images with the high resolution,

关键词：倾斜地球同步轨道 SAR 北斗聚焦信号

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A novel low-overhead fault tolerant parallel-pipelined FFT design

A novel low-overhead fault tolerant parallel-pipelined FFT d...

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IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems

作者： Yu Xie Chen Yang Chuang-An Mao He Chen Yi-Zhuang Xie Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China

As soft errors become a significant threat to modern electronic systems, the first priority of protection against soft errors should be decreasing resource consumption. This brief proposes a novel low-overhead fault tolerant FFT design, combining modified reduced precision redundancy (RPR) method and error correction codes (ECCs). RPR can lower the hardware overhead when compared with traditional full-precision redundancy techniques, especially when resource of the original design is huge. ECCs are cost-efficient for achieving fault tolerance on our parallel-pipelined FFT. As an example, an FPGA implementation of a four-channel 16K-point FFT is presented, which demonstrates that the proposed scheme can further reduce the overhead of fault tolerance designs.

关键词： Redundancy Fault tolerant systems Program processors Field programmable gate arrays Error correction codes Tunneling magnetoresistance

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Optimization and Verification of OpenV PX-Based 10Gbps Interconnection

Optimization and Verification of OpenV PX-Based 10Gbps Inter...

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2017 17th IEEE International Conference on Communication technology (ICCT 2017)

作者： Rongrong Ben Xingming Li Shanqing Hu Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Tsinghua University

As serial date rates migrate to 10Gbps and beyond, the list of signal integrity(SI) concerns and pitfalls grows. This paper focuses the design of SI of 10G serial link on OpenVPX system, and the research of the corresponding design and optimization methods based on passive design of 10Gbps high speed serial link. Combined pre-emphasis and equalization, the design enhances the quality of full link, reduces the bit error rate, and ensures accurate transmission of 10Gbps serial signal, with margin left for system operation. With simulation and testing, the methods are verified to be accurate and feasible in this paper.

关键词： OpenVPX 10Gbps signal integrity simulation

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Adaptive feature representation for visual tracking

arXiv

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arXiv 2017年

作者： Han, Yuqi Deng, Chenwei Zhang, Zengshuo Li, Jiatong Zhao, Baojun Beijing Key Laboratory of Embedded Real-time Information Processing Technique Beijing Institute of Technology Beijing100081 China

Robust feature representation plays significant role in visual tracking. However, it remains a challenging issue, since many factors may affect the experimental performance. The existing method which combine different features by setting them equally with the fixed weight could hardly solve the issues, due to the different statistical properties of different features across various of scenarios and attributes. In this paper, by exploiting the internal relationship among these features, we develop a robust method to construct a more stable feature representation. More specifically, we utilize a co-training paradigm to formulate the intrinsic complementary information of multi-feature template into the efficient correlation filter framework. We test our approach on challenging sequences with illumination variation, scale variation, deformation etc. Experimental results demonstrate that the proposed method outperforms state-of-the-art methods favorably. Copyright © 2017, The Authors. All rights reserved.

关键词： Machine learning

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Virtual single-node processing for SAR imaging based on multi-DSP

Virtual single-node processing for SAR imaging based on mult...

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2016 IEEE International Conference on Signal processing, Communications and Computing, ICSPCC 2016

作者： Ye, Jin Shanqing, Hu Jiayun, Zhao Teng, Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China

ISBN: (纸本)9781509027088

With the development of SAR technology, the SAR imaging processing data capability and computation complexity increases greatly. According to the situation, we design a virtual single node (VSN) parallel processing method, which uses 8 TMS320C6678 DSPs as a big processor to realize the large capability distributed storage and short time delay of SAR imaging processing. This method designs a remote reading and writing time beat of range line and azimuth line in distributed DDR to improve the remote transmission bandwidth between DSPs, and a data layout optimization approach in local DDR to achieve a balanced two-dimensional matrix local storage bandwidth. Finally, this paper realizes the SAR imaging algorithm based on the VSN method using 8 C6678s. © 2016 IEEE.

关键词： Digital storage

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An FPGA-Accelerated Doppler Parameters Estimation Engine for real-time Synthetic Aperture Radar Imaging System

An FPGA-Accelerated Doppler Parameters Estimation Engine for...

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International Conference on information Science and Control Engineering (ICISCE)

作者： Bingyi Li Ying Wang Linlin Fang Yizhuang Xie He Chen Liang Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing China School of Information and Electronics Beijing Institute of Technology Beijing China Shanghai Academy of Spaceflight Technology Beijing China

In this paper, we demonstrate an achievable implementation of Doppler parameters estimation engine. Taking advantage of FPGA, a highly parallelized and reconfigurable structure with a unified calculation is adopted. We build a prototype using single off-the-shelf Xilinx XC6VSX315T FPGA to verify the proposed method in a 16384 ×16384 SAR imaging process. The experiment result can achieve more than 20× time speedups over CPU-based solution, and the FPGA hardware resources can be balanced.

关键词： Field programmable gate arrays Doppler effect Synthetic aperture radar Radar polarimetry Fitting real-time systems

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Geosynchronous SAR imaging algorithm research 13

Geosynchronous SAR imaging algorithm research

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13th IEEE International Conference on Signal processing, ICSP 2016

作者： Ding, Zegang Yin, Wei Zhang, Tianyi Zhang, Ziqing Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509013449

The imaging in geosynchronous synthetic aperture radar (GEO SAR) is more difficult than that of the conventional low earth orbit (LEO) SAR. This paper discusses the problems in GEO SAR imaging, reviews the previous studies, and provides basic solutions to the remaining problems. The two-dimensional space variance of the focusing parameters in the large scene, especially in the squint mode, has not been solved completely, and further improvement for the non-linear chirp scaling method is required. The nearly zero time bandwidth product at some orbital positions of GEO SAR causes the infeasibility of the frequency domain algorithms, and a time domain compensation method can be studied to enlarge the time bandwidth product. Besides, in the long integration time of GEO SAR, the effects of non-ideal factors and the backscattering characteristics variance of the target are quite serious, and the corresponding motion compensation methods require to be studied. © 2016 IEEE.

关键词： Synthetic aperture radar

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Suppressing the Effects of Ionospheric Scintillation on Geosynchronous SAR by Optimised Orbit Design

Suppressing the Effects of Ionospheric Scintillation on Geos...

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International Conference on Radar Systems

作者： YuanHao Li XiangRong Liu Cheng Hu XiChao Dong Beijing Institute of Technology Beijing Beijing CN National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics 100076 China Beijing Key Laboratory of Embedded Real-time information Processing Technology 100081 China

ISBN: (纸本)9781785616723

An L band geosynchronous synthetic aperture radar (GEO SAR) will be sensitive to ionosphere scintillation because of its low carrier frequency. Meanwhile, because of the high orbit, GEO SAR has a higher probability to meet ionospheric scintillation. In this paper, we propose an orbit strategy for eliminating the impacts of ionospheric scintillation. It is realized by selecting a proper orbit element (time past perigee) to avoid imaging for the sensitive region of ionospheric scintillation during the eruption time interval of ionospheric scintillation with the highest probability. Finally, the simulation based on systems tool kit (STK) software was conducted to verify the effectiveness of the method.

关键词： Geosynchronous SAR Ionospheric scinitllation Orbit design SAR imaging

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Signal modeling and experimental verification in GNSS forward scatter radar 17

Signal modeling and experimental verification in GNSS forwar...

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17th International Radar Symposium, IRS 2016

作者： Changjiang, Liu Cheng, Hu Tao, Zeng Li, Wang Teng, Long Beijing Key Laboratory of Embedded Real-time Information Processing Technology Department of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781509025183

This paper focuses on the signal modeling and character analysis in the passive radar system using global navigation satellite system (GNSS) satellites as illuminators of opportunity. The signal model derived from the GNSS tracking loop shows that it contains information of both the scatter coefficient and the signal Doppler. An experiment using metal board as target was carried out and the results verified the correctness of the given model. © 2016 IEEE.

关键词： Global positioning system

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