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2017 International Conference on Radar Systems, Radar 2017

作者： Cai, Jinjian Xu, Jia Sun, Yinghao Long, Teng Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781785615153

Phase autofocus is a key step of translational motion compensation (TMC) in inverse synthetic aperture radar (ISAR). In this paper, a modified phase autofocus algorithm is proposed for ISAR to improve the computational efficiency of single eigenvector based autofocusing method. Under the circumstance that a relatively prominent scatterer exists, it is found that the signal subspace can be obtained as an estimation of the phase error caused by target translational motion. In the proposed method, samplings in multiple pulses are used to construct the covariance matrix and obtain the signal subspace, which is equivalent to the existing method with samplings along multiple range bins. Finally, the results of real measured data are provided to demonstrate the effectiveness of the proposed method. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Computational efficiency

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Low sidelobe beamforming method based on linear constraint reconstruction for colo-cated MIMO radar

Low sidelobe beamforming method based on linear constraint r...

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2017 International Conference on Radar Systems, Radar 2017

作者： Xu, Feng Yang, Xiaopeng Sun, Yuze Beijing Key Laboratory of Embedded Real-time Information Processing Technology School of Information and Electronics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781785615153

Beam pattern synthesis is of great interest for colocated MIMO radar with larger aperture. Sever gating lobes and high sidelobe level would cause great performance loss when the transmitting array is sparse. In order to achieve a better beam pattern performance for colocated MIMO radar, a low sidelobe beamforming method based on linear constraint reconstruction is proposed. In this proposed method, beam pattern nulls are formed in the specified direction of grating lobes by using reconstructed linear constraints, which can work with low sidelobe window function. These constraints are proper eigenvectors of reconstructed covariance matrix. Comparing with conventional method, arbitrary low sidelobe weight is applied instead of quiescent weight, thus the beam pattern can obtain low sidelobe level while maintaining the ability of anti-jamming. Simulation results verify the efficiency of this proposed method in both uniform array and sparse array. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： MIMO radar

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Optimization and verification of OpenVPX-based 10Gbps interconnection 17

Optimization and verification of OpenVPX-based 10Gbps interc...

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17th IEEE International Conference on Communication technology, ICCT 2017

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

ISBN: (纸本)9781509039432

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 10 Gbps serial signal, with margin left for system operation. With simulation and testing, the methods are verified to be accurate and feasible in this paper. © 2017 IEEE.

关键词： Bit error rate

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A Four-Bank Memory Design of Optimized Semi-Parallel Polar Decoder 9

A Four-Bank Memory Design of Optimized Semi-Parallel Polar D...

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2017 9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)

作者： Shiwen Xing Yun-Nan Chang Liang Chen Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Department of Computer Science and Engineering Sun Yat-sen University

ISBN: (纸本)9781509038237;9781509038220

Polar code, which is capable of achieving channel capacity, is known as a promising forward error correction（FEC） code in coding theory. In this paper, a four-bank memory architecture is proposed for polar decoder to store the initial and the intermediate processing data. Based on the proposed load-balance data allocation scheme, each memory bank is able to be equipped with only two access ports, while providing enough data bandwidth demand. Besides, the proposed semi-parallel successive cancellation（SC） polar decoder is optimized by employing the efficient p node and the merged computation of f and g nodes to reduce the decoding latency, which can at most get 62.5% speed improvement with enough processing elements（PEs）. In addition, the proposed four-bank memory design can reduce the overall size of memory especially with higher level of parallelism.

关键词： ploar code successive cancellation decoding fourbank memory design optimized semi-parallel design

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Analysis of micro-motion feature in ISAR imaging via phase-derived velocity measurement technique

Analysis of micro-motion feature in ISAR imaging via phase-d...

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2017 IEEE Radar Conference, RadarConf 2017

作者： Guo, Liyong Fan, Huayu Liu, Quanhua Hu, Cheng Yang, Xiaopeng Beijing Key Laboratory of Embedded Real-time Information Processing Technology Radar Research Lab Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781467388238

A novel ISAR (inverse synthetic aperture radar) motion compensation approach in conjunction with the phase-derived velocity measurement (PDVM) technique to extract micro-motion feature is presented in this paper. In order to obtain high quality ISAR image, the accurate velocity information provided by PDVM is utilized for target motion compensation. By analyzing proper amount of adjacent Doppler cells around the prominent scatterer in the ISAR image, the impact of other scatterers is effectively reduced for micro-motion extraction. Experiments based on radar measured data are performed to show the effectiveness of the proposed method. © 2017 IEEE.

关键词： Inverse synthetic aperture radar

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CHANGE DETECTION IN OPTICAL REMOTE SENSING IMAGES WITH A FULLY OBJECT-LEVEL APPROACH

CHANGE DETECTION IN OPTICAL REMOTE SENSING IMAGES WITH A FUL...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Long Ma Zhihong Mai He Chen Wenchao Liu Fan Feng Guichi Liu N. Q. Soomro School of Information Engineering Zhengzhou University Zhengzhou China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Department of Software Engineering Khairpur Sindh Pakistan

In this paper, an efficient and accurate multilevel change detection method is presented, achieved by the combination of an unsupervised object-based correlation analysis and a supervised post-classification comparison. Before the change detection procedure, fast multitemporal segmentation is applied to provide object-level information on two registered images. Then the proposed object-based correlation analysis method is used to extract the potential changed areas efficiently and stably, which improves the accuracy of overall performance. Notably, all the procedures are highly automatic except for the necessary selection of training examples within all supervised algorithms. The experimental results demonstrate the superior performance of our method compared with the four typical state-of-the-art change detection methods.

关键词： Image segmentation Correlation Support vector machines Correlation coefficient Training Change detection algorithms Optical imaging

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3-dimensional target localization accuracy analysis based on radar network with aerial and ground-based nodes 18

3-dimensional target localization accuracy analysis based on...

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18th International Radar Symposium, IRS 2017

作者： Taoyu, Lu Feifeng, Liu Lun, Tian Tao, Zeng Teng, Long School of Information and Electronics Beijing Institute of Technology 100081 China Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing100081 China

ISBN: (纸本)9783736993433

Radar network has important application in many fields, such as small target detection etc, especially for the case with wide baseline. Until now, the research to the 3-dimensional (3D) target localization accuracy using radar network is still a research focus in the radar community. In this paper, further research to the radar network with aerial and ground-based nodes is carried out, and the analytical expression of 3D target localization accuracy is derived using the Cramer-Rao lower bound (CRLB). Based on the analytical formulae, impacts of the system topology on the target localization accuracy are investigated. Finally, numerical simulations verify the theoretical analysis of the results.. © 2017 DGON.

关键词： Antennas

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High-precision deformation monitoring algorithm for GBSAR system: rail determination phase error compensation

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Science China(information Sciences) 2016年第8期59卷 204-219页

作者： Cheng HU Mao ZHU Tao ZENG Weiming TIAN Cong MAO Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

In recent years, the repeat-pass GBSAR(ground based synthetic aperture radar) system has demonstrated its capacity to acquire deformation. Nevertheless, in a variety of applications, it needs to measure the deformation with the precision up to 0.1 mm, which could not be reached by utilizing the traditional PS(permanent scatterer) algorithm in most cases. Generally, one of the main reasons could be summarized into the phase error caused by the rail determination error, because the precision of rail determination might degrade during long working hours. However, the traditional PS algorithm could not compensate for the phase error caused by the rail determination error. In order to solve the problems, we modify the conventional PS ***, we deduced the transformation relationship between the rail determination error and its corresponding interferometric phase error. Then, the phase errors caused by the atmosphere and the rail determination error were jointly compensated. The experimental data, which were obtained in Fangshan District in beijing(China), were used to test and verify the performance of the new algorithm. After the comparison between the results processed by the new algorithm and those processed by the traditional algorithm, the proposed method demonstrated its ability to obtain high-precision deformation.

关键词： permanent scatterer(PS) synthetic aperture radar(SAR) ground-based SAR deformation monitoring radar

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A high-accuracy interferometric SAR images registration strategy combined with cross correlation and spectral diversity

A high-accuracy interferometric SAR images registration stra...

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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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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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2017 International Conference on Radar Systems, Radar 2017

作者： Li, YuanHao Liu, XiangRong Hu, Cheng Dong, XiChao School of Information and Electronics Beijing Institute of Technology 100081 China 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)9781785615153

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. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Synthetic aperture radar

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