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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

作者： Wu, Zhong-Da Meng, Fan-Yi Hua, Jun Chen, Mei-Liang Department of Microwave Engineering Harbin Institute of Technology Harbin China Science and Technology on Communication Information Security Control Laboratory Jia Xing 314033 China

A broadband sleeve antenna with very small ground has been presented based on impedance matching network and resistive load. The VSWR of the proposed antenna is less than 2 from 0.17GHz to 0.52GHz. The efficiency of t... 详细信息

ISBN: (纸本)9781467313032

关键词： Impedance matching (electric)

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A Single-Observer Passive Location Algorithm Base on Weighted Least Squares Criterion

A Single-Observer Passive Location Algorithm Base on Weighte...

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International Conference on communication technology (ICCT)

作者： Jiang Bin Lu An'nan You Mingyi Lou Caiyi Ye Yunxia Huang Kai Shi Binhua Communication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing Jiaxing China

Passive location system that locates “silent” targets using an non-cooperative opportunistic source (also called external illuminator) is great importance in a variety of applications. To solve the problem of using a single observation station to receive a single external radiation source signal to realize the target location, the paper proposes a weighted least squares location algorithm combining direction finding and time difference information. In this algorithm, the location problem is constructed as a weighted least squares model considering the error of each measurement information, and then the grid search strategy is used to solve the model to obtain the target location. After that, the positioning error of the algorithm is theoretically analyzed, and the influence of direction finding error, measurement time difference error, observation station position error and external radiation source position error on the target positioning error is studied. Finally, the performance of the algorithm is verified by several simulation tests.

关键词： Location awareness Weight measurement Simulation Measurement uncertainty Position measurement Search problems Time measurement

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The Method to Recognize Linear Block Code Based on the Distribution of Code Weight 10

The Method to Recognize Linear Block Code Based on the Distr...

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10th International Conference on communication Software and Networks, ICCSN 2018

作者： Lei, Wang Yizhou, Ge Fucai, Zhao Yong, Wang Science and Technology on Communication Information Security Control Laboratory Jiaxing China Key Laboratory of Electronic Restriction Anhui Province National University of Defense Technology Hefei China

ISBN: (纸本)9781538672235

The definition and matrix description of linear cyclic code is introduced in this paper first. Then the distribution of code weight is analyzed. The distance of code weight distribution is defined according to distance of vectors. The theoretic probability of code weight of random sequence is ratiocinated. The method to estimate code weight distribution of actual sequence is established. The code length and start are estimated by the distance between the code weight distribution and the check matrix and generation matrix are estimated by Gauss Elimination. The results of simulating experiment to different length code show that this method can recognize code with middle and short code length effectively when BER is 10-3. © 2018 IEEE.

关键词： Matrix algebra

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Geomagnetic Matching Combined Navigation Based on Improving Operation Efficiency of DTW Algorithm

Geomagnetic Matching Combined Navigation Based on Improving ...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Gang Huo Junna Shang Dongli Zhang Yiteng Wang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of China Electronics Technology Group Corporation Hangzhou Dianzi University HangZhou Zhejiang Hangzhou Dianzi University HangZhou Zhejiang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of China Electronics Technology Group Corporation Jiaxing Zhejiang

ISBN: (纸本)9781665444927

Aiming at the problem of “singularity” generated by the traditional DTW matching algorithm, the DDTW matching algorithm is used to match the geomagnetic sequence, and the first derivative of the sequence is compared for matching, and the Itakura window is used as a constraint to restrict the search range. In order to improve the overall positioning effect, a combination of inertial navigation and geomagnetism is used for navigation, and Kalman filtering is used to fuse the positioning results. Experimental results show that when the matching window is 60, the average positioning error of the system using the improved DDTW matching algorithm is within 1.37m. Compared with the system using the DTW matching algorithm, the average positioning error is reduced by 0.59m and effectively improved Computing efficiency.

关键词： Geomagnetism Filtering Fuses Heuristic algorithms Instruments Inertial navigation Aerospace electronics

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A DOA estimation method for area array based on dimensionality reduction processing

A DOA estimation method for area array based on dimensionali...

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International Conference on information science and control Engineering (ICISCE)

作者： Sun Wei Han Yu Zhou Qing Science and Technology on Commuication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing Zhejiang China

Aiming at the problems of traditional beamforming algorithms that require a two-dimensional angle search for two-dimensional DOA estimation using rectangular arrays, which takes a long time, this paper provides a dimensionality reduction method through theoretical derivation and numerical calculation. This method uses coordinate conversion and secondary optimization, successively calculates the angle of the target relative to the X and Y axes, and combines the idea of least squares to finally calculate the azimuth and elevation angle of the target, turning the two-dimensional problem into a one-dimensional search, which greatly reduces the amount of calculation. The simulation results show that the angle estimation accuracy of this method is equivalent to that of the traditional MUSIC method, but its algorithm complexity and calculation time are reduced a lot, which is very suitable for engineering applications.

关键词： Dimensionality reduction Direction-of-arrival estimation Simulation Estimation Optimization methods Search problems Turning

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A Graph-Based Semi-Supervised Approach for Few-Shot Class-Incremental Modulation Classification

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China communications 2024年第11期21卷 88-103页

作者： Zhou Xiaoyu Qi Peihan Liu Qi Ding Yuanlei Zheng Shilian Li Zan State Key Laboratory of Integrated Service Networks Xidian UniversityXi’an 710071China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China The No.011 Research Center Science and Technology on Communication Information Security Control LaboratoryJiaxing 314033China

With the successive application of deep learning(DL)in classification tasks,the DL-based modulation classification method has become the preference for its state-of-the-art ***,once the DL recognition model is pre-trained with fixed classes,the pre-trained model tends to predict incorrect results when identifying incremental ***,the incremental classes are usually emergent without label information or only a few labeled samples of incremental classes can be *** this context,we propose a graphbased semi-supervised approach to address the fewshot classes-incremental(FSCI)modulation classification *** proposed method is a twostage learning method,specifically,a warm-up model is trained for classifying old classes and incremental classes,where the unlabeled samples of incremental classes are uniformly labeled with the same label to alleviate the damage of the class imbalance *** the warm-up model is regarded as a feature extractor for constructing a similar graph to connect labeled samples and unlabeled samples,and the label propagation algorithm is adopted to propagate the label information from labeled nodes to unlabeled nodes in the graph to achieve the purpose of incremental classes *** results prove that the proposed method is superior to other finetuning methods and retrain methods.

关键词： deep learning few-shot label propagation modulation classification semi-supervised learning

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Defense of Signal Modulation Classification Attack Based on GAN 7th

Defense of Signal Modulation Classification Attack Based on ...

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7th China National Conference on Big Data and Social Computing, BDSC 2022

作者： Zhu, Jiawei Liu, Yuhang Xu, Dongwei Yang, Hao Xuan, Qi Wang, Shunling Science and Technology on Communication Information Security Control Laboratory Jiaxing314033 China Institute of Cyberspace Security Zhejiang University of Technology Hangzhou310023 China College of Information Engineering Zhejiang University of Technology Hangzhou310023 China

ISBN: (纸本)9789811975318

Although deep learning has been broadly used in all kinds of domains and has also achieved very good performance, it is obvious that deep learning is very vulnerable to be attacked shown by extensive researches (e.g. even a very small perturbation is added to the raw signal data, the result of the modulation classification of the signal by the deep neural network will be wrong), which will cause serious consequences. Thus, it is necessary to find some ways to defense this attack. As a new deep learning model in recent years, Generative Adversarial Network (GAN) has been applied to the field of radio communication, which can encrypt the signal data, so as to ensure the reliable transmission of the signal. In this paper, a defense method against signal modulation classification attack based on GAN is developed, which is used to utilize generator to reconstruct the signal sample to improve the classification accuracy of the model, while the defense ability of the model against adversarial samples is improved. It has been shown that the method achieved good results in experiments. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Deep neural networks

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Research on performance analysis and optimization methods of bistatic collaborative detection 13

Research on performance analysis and optimization methods of...

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13th ACM International Conference on Underwater Networks and Systems, WUWNet 2018

作者： Guo, Longxiang Zhou, Qing Liu, Ting Zou, Jiayun Sheng, Xueli Science and Technology on Communication Information Security Control Laboratory JiaxingZhejiang China College of Underwater Acoustic Engineering Acoustic Science and Technology Laboratory Harbin Engineering University HarbinHeilongjiang China

ISBN: (纸本)9781450361934

Compared with the monostatic sonar system, the bistatic sonar system has numerous advantages, such as being quick and flexible to deploy, utilizing strong concealment, and having a large detection range. The detection performance analysis system, which consists of the sound source and propagation loss level, the interfering noise level, the marine reverberation average strength level, and the target echo sound level, was established in this study. Aiming at a specified area, this study realizes a performance analysis based on the detection probabilities of targets in different locations. In terms of detection performance, the bistatic sonar system especially faces considerable direct wave interference. Therefore, a method for restraining direct wave interference based on zero constraint beam-forming was developed. This method can mitigate the both narrow-band and broadband direct wave interference problems. Another method based on space timeadaptive processingwas also developed. This method can also solve direct wave interference problem. Using the above performance analysis system, considering the influence of strong direct wave interference, the detection range can increase 35% by using the zero constraint beam-forming method, thus further enhancing the detection performance. © 2018 Association for Computing Machinery.

关键词： Sonar

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Metamaterial analogue of electromagnetically induced transparency

Metamaterial analogue of electromagnetically induced transpa...

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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

作者： Hua, Jun Chen, Mei Liang Zhu, Lei Meng, Fan Yi Wu, Qun Science and Technology on Communication Information Security Control Laboratory Jiaxing 314033 China Dept. of Microwave Engineering Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9781467313032

In this paper, three types of EIT metamaterials are presented and numerically investigated. The type I metamaterial consists of the SR and the SRR, which are coupled with each other and assigned as the dark resonator and the radiative resonator, respectively. The metamaterial can exhibit EIT effect to both normally and laterally incident electromagnetic waves because of its electric and magnetic response, respectively. The type II magnetic metamaterial consists of the split ring resonator (SRR) and the spiral resonator (SR) along two orthogonal axes. For the excitation with the magnetic field perpendicular to the SRR plane, the SRR and the SR are designated as the radiative element and the dark element, respectively. A transparency window is observed in the overlapped absorption band of the independent resonator because of the destructive interference between the radiative and dark resonators of the metamaterial. The type III metamaterial is consisted of three cut wires of different sizes and parallel to each other. The resonance frequencies are different because the lengths of three metal wires are different. Under the polarization of electrical field, because three cut wires experience strong resonance, two-two overlaps of absorption bands of three cut wires will induce two transparency windows. Numerical simulations are carried out to validate the three types of EIT metamaterials, and the results have proven to be quite effective. © 2012 IEEE.

关键词： Metamaterials

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High gain patch antenna with broadband metamaterial lens

High gain patch antenna with broadband metamaterial lens

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2012 5th Global Symposium on Millimeter-Waves, GSMM 2012

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

ISBN: (纸本)9781467313032

Antenna lens can obviously eincrease the gain of the antenna by method of gathering. Also, metamaterial lens can achieve the gathering effect with aspheric surface. In this paper, a new type of metamaterial lens is designed. It is easy to identify as Left-hand material with double negative electromagnetic constant, realizing a negative permittivity and a negative permeability simultaneously. The new structure can perform at a lower frequency and the band of the structure can get a good result in broad band. In addition, the new proposed metamaterial lens do not change the S-parameter of the original antenna. The gain can be increased by 2 dB with the new structure of the metamaterial lens. © 2012 IEEE.

关键词： Microstrip antennas

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