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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Xin Liao Shuai Liu Yin Xiang Zegang Ding Xuemei Yan Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China CAST Beijing Institute of Spacecraft System Engineering Beijing China

ISBN: (纸本)9781509027095

In the paper, a non-contact vibration retrieval method was presented and the performance was analyzed based on linear frequency modulation continuous wave (LFMCW) radar. Firstly, the backscattered signal model of a vibrational target was introduced with the stop-go assumption. Then a vibration retrieval method was proposed by extracting phase based on the backscattered signal model of a vibrational target. The influence of noise and clutter on vibration retrieval was analyzed, and the signal noise ratio of vibration measurement was obtained. Finally, the validity of the performance analysis was verified by computer simulations. In addition, the experimental data acquired by LFMCW radar was used to test the proposed method.

关键词： Vibrations Radar Clutter Signal to noise ratio Phase noise Vibration measurement Receivers

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A π/4 Compact Polarimetric Model for High-Resolution Radar in Target Recognition

A π/4 Compact Polarimetric Model for High-Resolution Radar ...

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CIE International Conference on Radar

作者： Liang Zhang Suixue Wang Yu Wang Yin Xiang Junfu Wang Yanhua Wang Yang Li Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing China Beijing Racobit Electronic Information Technology Co. Ltd. Beijing China

Polarimetric information can fully reflect the electromagnetic scattering characteristics of radar target. Compact polarization, which can reduce the system complexity while preserving the polarimetric information has become an important technique of getting polarimetric information in recent years. In this paper we propose a modified implementation for π/4 compact polarimetric mode radar, where the transmitter polarization is orientated at 45°, and the receivers are at 45° and 135° polarizations. A procedure of reconstructing the full polarimetric information and extracting the features are subsequently deduced. From experimental data, we verify the scheme can distinguish different polarimetric scattering mechanisms. The method shows potential to better reconstruct fully polarimetric data and application value in target recognition.

关键词： polarimetric radar high-resolution radar compact polarization target recognition

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A waterborne salient ship detection method on SAR imagery

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Science China(information Sciences) 2015年第8期58卷 193-196页

作者： MA Long CHEN Liang ZHANG XueJing CHEN He Nouman Qadeer SOOMRO Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology College of Information Technology Beijing Union University School of Computer Science Beijing Institute of Technology

Dear editor,Synthetic aperture radar(SAR)is a powerful electro-optic sensor for maritime use regardless of impact of time and meteorological ***,ship detection plays an important role in maritime

关键词： SAR A waterborne salient ship detection method on SAR imagery Figure

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ISAR motion compensation based on matching pursuit with Chebyshev polynomials under low SNR

ISAR motion compensation based on matching pursuit with Cheb...

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Jing Gao Feng Li Chao Wang Teng Long School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-time Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

Targets of inverse synthetic aperture radar (ISAR) are non-cooperate and the motion compensation should be performed first. This paper proposes a method for ISAR motion compensation. In range-frequency domain, the motion of imaging target can be modeled as Chebyshev-polynomial phase function that is an orthogonal polynomial and has more approximation accuracy than Taylor polynomial. With pulse compression, the data are transformed into range frequency domain. The parameters in polynomial are estimated by matching pursuit (MP). Different from general treatments, simulated annealing algorithm is introduced into MP. And parameters are estimated in continuous field. The algorithm estimates the motion parameters before range compression and avoids the loss of pulse compression. Simulations testify that the proposed method work better under low SNR than methods based on entropy minimization or contrast maximization. Stepped-frequency waveforms with phase coding in subpulses are used in our experimental system. Wide-band signals are synthesized by narrow-band subpulses, which could obtain high-resolution range resolution. To acquire the similar cross-range resolution, more coherent integration interval is needed. Imaging experiments that testify our method also perform well in this case.

关键词： Image coding Indexes Matched filters Chebyshev approximation Signal to noise ratio Integrated circuits Remote sensing

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Micro-Doppler extraction from scatterer phase in ISAR image

Micro-Doppler extraction from scatterer phase in ISAR image

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IEEE International Conference on Signal processing, Communications and Computing (ICSPCC)

作者： Chaojie Zhang Feng Li Jing Gao Mingyuan Yang Teng Long School of Information and Electronics Beijing Institute of Technology Beijing China Beijing Key Laboratory of Embedded Real-time Beijing Institute of Technology Beijing China

ISBN: (纸本)9781509027095

Translation trajectory is approximated by Chebyshev polynomial to improve approximation accuracy under low signal-to-noise ratio. The parameters in the polynomial are estimated by matching pursuit (MP). The operation of translation parameters estimation is performed in frequency domain before pulse compression. After compensation of translation and rotation, micro-Doppler is extracted from the result of motion compensation based on vibration model. Simulation and experiment data are used to testify our method.

关键词： Vibrations Matching pursuit algorithms Doppler effect Chebyshev approximation Image resolution Bandwidth Synthetic aperture radar

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Textural and Gradient Feature Extraction from JPEG2000 Codestream for Airfield Detection

Textural and Gradient Feature Extraction from JPEG2000 Codes...

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Data Compression Conference (DCC)

作者： Cheng Li Chenwei Deng Baojun Zhao School of Information and Electronics Beijing Institute of Technology Beijing P.R.China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Beijing P.R.China

There has been huge growth in the use of optical images in object detection, and numerous images over satellite and aerial vehicle are typically stored and transmitted in the compressed form such as JPEG2000. However, most of the existing detection algorithms are built in the pixel domain, which leads to enlarge data volume and requires compulsory decompression before detecting. Hence, these issues may hinder their practical use in real-time and storage limited applications. In this paper, we extract textural and gradient features from JPEG2000 compressed codestream, and these robust features are utilized for coarse-to-fine airfield detection. The contributions of proposed work are as follows: 1) packet header is effectively exploited for presenting textural information of images, while gradient calculation is achieved in packet body, 2) a novel detection framework taking full advantage of compressed features is proposed. Validated by experiments with large optical images, the proposed method achieves faster computation with higher detection accuracy, in comparison with the existing relevant state-of-the-art approaches.

关键词： Feature extraction Image coding Transform coding Remote sensing Registers Airports

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Nucleic acid secondary structures prediction with planar Pseudoknots using genetic algorithm 11th

Nucleic acid secondary structures prediction with planar Pse...

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11th International Conference on Bio-inspired Computing – Theories and Applications, BIC-TA 2016

作者： Kai, Zhang Shangyi, Li Juanjuan, He Yunyun, Niu School of Computer Science Wuhan University of Science and Technology Wuhan430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan430081 China School of Information Engineering China University of Geosciences Beijing100083 China

ISBN: (纸本)9789811036132

Nucleic acid nanotechnology offers many methods to fold into a variety of complex and functional nanostructures. These selfassemble scaffolds are valuable in various applications, such as molecular programming, sensing, drug delivery and nanofabrication. However, existing algorithms are typically lacking on predicting pseudoknots structure fast and accurately. This paper proposes a novel genetic algorithm to predict nucleic acid secondary structure including pseudoknots. The length of continues base pairs stacking and free energy are considered to evaluate individuals. Furthermore, the performance of our algorithm is compared with RNAStructure using PseudoBase benchmark instances, and the results show that our algorithm outperforms on accuracy and efficiency. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Nucleic acids

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Applying K-means clustering and genetic algorithm for solving MTSP 11th

Applying K-means clustering and genetic algorithm for solvin...

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11th International Conference on Bio-inspired Computing – Theories and Applications, BIC-TA 2016

作者： Lu, Zhanqing Zhang, Kai He, Juanjuan Niu, Yunyun School of Computer Science Wuhan University of Science and Technology Wuhan430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan430081 China School of Information Engineering China University of Geosciences Beijing100083 China

ISBN: (纸本)9789811036132

In this paper, a new algorithm is designed to solve Multiple Traveling Salesman Problem (MTSP) that avoiding the path intersection among the traveling salesmen. There are three objectives in this problem including the shortest path of every salesman, the balance of each salesmans task and avoiding the crosses of each routes. We combine the K-means algorithm and genetic algorithm. K-means algorithm is designed to divide all points into several subsets and choose the start city for the genetic algorithm, and then using GA to process every subsets in parallel. This method not only achieve these multiple objectives, but also use much less time, since we have divided all the points into several parts and make them calculated at the same time. © Springer Nature Singapore Pte Ltd. 2016.

关键词： Genetic algorithms

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An autofocusing imaging algorithm for wall penetrating SAR

An autofocusing imaging algorithm for wall penetrating SAR

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IET International Radar Conference 2015

作者： Liu, Wei Zheng, Meng Xiang, Yin Ding, Zegang Zeng, Tao Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology China

ISBN: (纸本)9781849199940

The absence of wall's characteristic will smear and blur the image, shift the target position, and even defocus the imaging result. To solve the problems, a novel autofocusing imaging algorithm is proposed in this paper. Firstly, the electromagnetic field is employed as a 2-D matching filter during the imaging processing. Then, the electromagnetic field in the airto-wall medium is replaced by that in the air-to-air medium. Thirdly, the mismatching error, which is proved to be an extra frequency gap at the shifted depth, is compensated by using the phase cross-correlation method. Finally, the correctness and efficiency of the proposed method are verified by the full wave simulation with data from CST.

关键词： Electromagnetic fields

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Experimental results and analysis for GBSAR deformation measurement

Experimental results and analysis for GBSAR deformation meas...

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IET International Radar Conference 2015

作者： Zhu, Mao Hu, Cheng Zeng, Tao Deng, Yunkai Tian, Weiming Mao, Cong Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology China

ISBN: (纸本)9781849199940

In this paper, the methodology, which uses GBSAR system to monitor the micro deformation of the scenario, was presented both theoretically and experimentally. In the process, the persistent scatterer (PS) technology was utilized to obtain the deformation of the scene. Firstly, the full basic PS process chain for deformation generation is presented. Secondly, the ground-based SAR system and the data acquisition of geometry are described briefly. Furthermore, the theoretical developments are complemented with the process of real data which is acquired in the experiment. Finally, the comparison between experimental results and local measurements is discussed, which demonstrated the feasibility of our GBSAR system to obtain high-precision deformation.

关键词： Synthetic aperture radar

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