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检索条件"机构=Science and Technology on Communication Information Security Control Laboratory NO.36"

共 353 条记录，以下是131-140 订阅

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Design and simulation of a S-band high gain antenna with metamaterial lens

Design and simulation of a S-band high gain antenna with met...

引用

2011 Cross Strait Quad-Regional Radio science and Wireless technology Conference, CSQRWC 2011

作者： Huang, Shuai Yang, Cheng Hua, Jun Wu, Qun Dept. of Microwave Engineering Harbin Institute of Technology Harbin 150001 China Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033 China

ISBN: (纸本)9781424497904

The patch antenna with metamaterial lens can effectively enhance the gain of the antenna. A new type of metamaterial lens is proposed in this paper, it is easy to distinguish as double negative metamaterial, presenting a negative permitivity and a negative permeability simultaneously. The novel structure can work at a lower frequency and the passband of metamaterial lens can get a good performance in a wide band. Moreover, the designed metamaterial lens do not change the S-parameter of the patch antenna. With the new structure of the metamaterial lens, the gain can be enhanced by 2 dB. © 2011 IEEE.

关键词： Microstrip antennas

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Cognitive Method Discussion on communication Jamming Intelligent Decision 2020

Cognitive Method Discussion on Communication Jamming Intelli...

引用

2020 International Conference on Aviation Safety and information technology, ICASIT 2020

作者： Jin, Hu Shen, Weiguo Zhao, Fan Science and Technology on Communication Information Security Control Laboratory Research Institute Jiaxing China Electronic Countermeasure Institute National University of Defense Technology Hefei China

ISBN: (纸本)9781450375764

The application of reconfigurable, programmable and cognitive radio technologies in communication systems has put forward new requirements for communication jamming decision. In this paper, the overall scheme of cognition-based jamming communication jamming decision methods is presented first. Then the method of intelligent communication jamming decision based on reinforcement learning is discussed under the condition of a large number of data samples of the communication signal, and how to build the element library of jamming strategy and how to describe the behavior of communication signal are described in detail. Moreover, the real-time dynamic jamming effect evaluation method based on target communication signal behavior learning is also discussed. As a result, an online, self-learning and self-optimizing cognitive jamming closed-loop is realized. © 2020 ACM.

关键词： Reinforcement learning

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Direct multi-hop time synchronization with constructive interference

Direct multi-hop time synchronization with constructive inte...

引用

11th ACM/IEEE Conference on information Processing in Sensing Networks, IPSN'12

作者： Wang, Yin Pan, Gaofeng Huang, Zhiyu MOE Key Lab. for Information System Security School of Software TNLIST China Science and Technology on Communication Information Security Control Laboratory China Institute of Software Chinese Academy of Sciences China

ISBN: (纸本)9781450312271

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multi-hop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate nodes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews. © 2012 ACM.

关键词： Synchronization

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SAR Image Processing and Target Detection Based on 2D Singularity Power Spectrum in Time-frequency Domain 5

SAR Image Processing and Target Detection Based on 2D Singul...

引用

5th IEEE International Conference on Signal and Image Processing, ICSIP 2020

作者： Li, Junye Xiong, Gang Huang, Baigang Shanghai Jiao Tong University School of Electronic Information and Electrical Engineering Shanghai China Science and Technology on Communication Information Security Control Laboratory Jiaxing314033 China

ISBN: (纸本)9781728168968

A method for SAR image processing and target detection based on two-dimensional singularity power spectrum (2D-SPS) in time-frequency domain is proposed in this paper. Firstly, the two-dimensional pseudo Wigner-Ville distribution (2D-PWVD) is carried out on the SAR image. Then, the two-dimensional singularity power spectrum estimation is performed on the local delay components of 2D-PWVD to obtain the three-dimensional singularity power spectral SAR (SPS-SAR) functions. Furthermore, a novel SAR target detection method based on SPS-SAR is introduced. The proposed methodology is tested on SAR images, both with and without weak targets, from the OpenSAR dataset. Experiment results show that the proposed method performs better than traditional method based on fractal theory, and can achieve higher detection probability in the complex scene with low SNR. It can provide more details for SAR image analysis and offer a new idea for SAR target detection. © 2020 IEEE.

关键词： Power spectrum

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A kind of better adjacent channel suppression multiple frequency shift keying signal simulation method based on MATLAB

A kind of better adjacent channel suppression multiple frequ...

引用

International Conference on communication technology (ICCT)

作者： Huan Li Wenhua Ye No.36 Research Institute of CETC Jiaxing Zhejiang China 2Science Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China

ISBN: (纸本)9781467370066

Frequency shift keying (FSK) modulation function in MATLAB without filter function, leading to poor adjacent channel suppression, which causes aliasing after a non-linear device easily. Based on FSK modulation signal generation principle, designing a better adjacent channel suppression function in this paper, which verified by demodulating through Agilent's vector signal analyzer (89600S), this function gets achieved more satisfactory results in the application of semi physical simulation.

关键词： MATLAB Frequency shift keying Interpolation Filtering Demodulation Modems

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Group establishing algorithm for strategic mobile scenario in manets

Group establishing algorithm for strategic mobile scenario i...

引用

2014 International Conference on information and communications Technologies, ICT 2014

作者： Xu, Xiaofeng Wang, Xiao Science and Technology on Communication Information Security Control Laboratory China Electronic Group Corporation No. 36 Institute Zhejiang Jinxing China School of Instrument Science and Opto-Electronics Engineering Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9781849198431

Wireless communication network has such features as limited bandwidth, changeful channel and dynamic topology, etc. In MANETS, the performance is significantly degraded as the scale of the network grows, which has lots of difficulties in accessing control, bandwidth distribution, resource assign and congestion control. Therefore, in this paper, we have proposed an online self-organized group establishing mechanism for strategic mobile scenarios of MANETs to realize the maneuverability of putting the secure group operations into effect. First of all, the algorithm performs initialization for each node, and then the nodes determine group-manager based on condition function and invite neighboring nodes to join in, finally, the rest nodes without grouping confirm their own groups by the group condition function. Both theoretical analysis and simulation experiments have demonstrated that our method can meet the scalability requirement which plays an important role in prolonging the network lifetime and effectively saving the communication, computation and storage overhead in strategic mobile scenario of MANETs.

关键词： Bandwidth

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Group establishing algorithm for strategic mobile scenario in manets

Group establishing algorithm for strategic mobile scenario i...

引用

2014 International Conference on information and communications Technologies, ICT 2014

作者： Xiaofeng, Xu Xiao, Wang Science and Technology on Communication Information Security Control Laboratory China Electronic Group Corporation No. 36 Institute Zhejiang Jinxing China School of Instrument Science and Opto-electronics Engineering Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9781849198431

关键词： Bandwidth

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A Passive Navigation Algorithm Based on Derivative Dynamic Time Regularization Geomagnetic Matching

A Passive Navigation Algorithm Based on Derivative Dynamic T...

引用

作者： Yiteng Wang Jinhong Bao Zehua Li Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of China Electronics Technology Group Corporation College of Telecommunication Engineering Hangzhou Dianzi University

As satellite positioning has shortcomings such as susceptibility to multipath interference, we look forward to using a new algorithm to solve these problems. The method of derivative dynamic time regularization is used as the matching method of geomagnetic navigation. Due to the factors of the inertial device itself, a certain cumulative error will occur in the positioning solution of the inertial navigation(INS). Therefore, an outdoor error model needs to be established, and the positioning error is corrected by filtering technology. To solve this problem, the Unscented Kalman Filter is used to fuse the positioning results of the two to obtain a more accurate positioning, with an average accuracy within 1.5 meters.

关键词： Integrated navigation algorithm Derivative dynamic time warping algorithm Unscented Kalman filtering

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A Dynamic Time Warping Based Wake-Up Signal Detection Method for Underwater Acoustic communication Networks 2

A Dynamic Time Warping Based Wake-Up Signal Detection Method...

引用

2nd IEEE Advanced information Management, Communicates, Electronic and Automation control Conference, IMCEC 2018

作者： Ma, Lu Fan, Cheng Sun, Wei Qiao, Gang Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China

ISBN: (纸本)9781538618035

T400 conventional underwater acoustic (UWA) wakeup signals detection methods for both underwater cooperative nodes and non-cooperative nodes are FFT based signal detection and matched-filtered based signal detection. While there is a big performance degradation of these conventional frequency-offset sensitive methods due to the relative motion between nodes, complex underwater noise environment, channel time-varying and other interference sources. This paper proposes a dynamic time warping (DTW) algorithm to detect the wake-up signal in UWA communication networks, which is frequency-offset insensitive and performs better than the conventional methods in severe frequency-offset environment by simulations based on the true UWA channel measured from sea trial. © 2018 IEEE.

关键词： Signal detection

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Classification and Recognition of Underwater Target Based on MFCC Feature Extraction

Classification and Recognition of Underwater Target Based on...

引用

IEEE International Conference on Signal Processing, communications and Computing (ICSPCC)

作者： Yuze Tong Xin Zhang Yizhou Ge School of Marine Science and Technology Northwestern Polytechnical University Xi’an China Science and Technology on Communication Information Security Control Laboratory NO.36 Research Institute of CETC Jiaxing China

ISBN: (数字)9781728172026

ISBN: (纸本)9781728172033

The key to underwater target recognition is to extract the effective features of underwater target radiation noise. This paper presents an effective method for underwater target recognition and classification by extracting Mel-Frequency Cepstral Coefficients (MFCCs) features of underwater target radiation noise. Compared with traditional spectral analysis methods, MFCC makes full use of the non-linear auditory effect of the human ear with different perception capabilities for sounds of different frequencies. In this paper, the classification experiment of the radiated noise of the three types of measured underwater targets is done, where the MFCC feature vectors of the three types of targets are extracted, and the K-Nearest Neighbor (K-NN) algorithm is used to classify and identify them. Finally, the experimental results show that the method is effective.

关键词： Feature extraction Mel frequency cepstral coefficient Target recognition Classification algorithms Filter banks Ear Auditory system

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