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Luoyang, China

Wu L.L.,Academy of Equipment Command and Technology | Cheng N.P.,Academy of Equipment Command and Technology | Liu X.G.,Unit 63880 of PLA
Applied Mechanics and Materials | Year: 2013

Common joint synchronization of timing and frequency algorithms based on training symbols are analyzed. Training symbols are discussed and then a new algorithm based on training symbol with special structure is proposed and applied in SC-FDE (Single Carrier Frequency Domain Equalization) systems. The proposed algorithm absorbs the advantages of the common algorithms and comparison between different algorithms shows that the proposed algorithm achieves better performance. © (2013) Trans Tech Publications, Switzerland. Source

Huang C.,Unit 63892 of PLA | Wu J.,Unit 63892 of PLA | Yao M.,Unit 63892 of PLA | Guo H.,Unit 63892 of PLA | And 4 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2011

Detection window structure of warning antenna was introduced for the laser passive warning system based on photoelectric diodes array; laser orientation detection principle of horizontal and vertical direction was analyzed; orientation identification model of laser threat signal was also established. Making use of orientation identification model of horizontal direction, the typical laser passive warning system based on photoelectric diodes array was analyzed. Influence of augmenting window field of view (FOV) on laser orientation identification precision was researched, and a new scheme of horizontal direction laser orientation identification was proposed. The analysis result shows that the system orientation identification precision of laser threat signal is retained after the scheme being introduced into the laser passive warning system, and the false alarm probability of laser warning system is reduced. The new scheme brings simpler detection circuit, smaller size, lower energy consume, and lower cost to the laser warning system than the multiple-unit correlated detection scheme. Source

Liang G.-B.,Unit 63880 of PLA | Li F.,Unit 63880 of PLA | Zhang X.-H.,Unit 63880 of PLA | Chen Y.,Unit 63880 of PLA
International Conference on Communication Technology Proceedings, ICCT | Year: 2012

In order to improve the antagonistic effect of GNSS (Global Navigation Satellite System) in information-based warfare, new generation GNSS signals would have higher precision of orientation and stronger anti-jamming performance, with the compatibility and cooperation with the signals of navigation satellite system in existence. By the analysis of receiving principle and characteristic of new generation GNSS signals, this paper studies the anti-jamming performance in the conditions of narrowband jamming, matching spectrum jamming, and white noise in band-limited. © 2012 IEEE. Source

Jiao B.,Unit 63880 of PLA | Huang C.-D.,Unit 63880 of PLA | Huang F.,Unit 63880 of PLA | Li W.,Unit 63880 of PLA
Kongzhi yu Juece/Control and Decision | Year: 2013

A new aggregation method for the analytic hierarchy process(AHP) judgment matrices in group decision-making is proposed. Firstly, the possibility degree which measures consistency under the condition of attributes ordering and the satisfiability degree which measures the difference between group judgment matrices and synthetic matrix are defined. Then, the optimum possibility degree matrix and the optimum satisfiability degree matrix are computed based on the linearly and continuity of fuzzy complementary judgment matrices. Finally, with the geometrical average between upper triangular elements of two optimum matrices, the optimum possibility-satisfiability degree synthetic matrix is acquired. Numerical examples show the effectiveness and practicability of the method proposed. Source

Wang X.,Unit 63880 of PLA | Wang G.,Unit 63880 of PLA | Jiang F.,Unit 63880 of PLA | Kang J.,Unit 63880 of PLA
Proceedings of the 2012 2nd International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2012 | Year: 2012

Internet Digital Cannon is a visualized name of ZMW attack, in which a BGP connection is periodically reset. When a number of BGP connections are attacked, a great lot of BGP notification error messages would surge and Internet performance would be depressed badly. As for ZMW or CXPST (which is proposed after ZMW), importance of vital links is twofold: Vital links can give a range of important defense links and instruct network defense, and on the other hand vital links can also enhance attacking effect observably by partitioning a network into several subnets. Based on graph theory, this paper proposes a cost function and applies spectral clustering algorithms which are mainly used in machine learning into vital links search of network topology partitioning. Partition effect of single and multi-eigenvector spectral clustering algorithms are simulated and result show: Multi-eigenvector spectral clustering algorithms have a lower cost and can partition a network topology into any number of subnets, and single eigenvector spectral clustering algorithms can only partition a network topology into 2n subnets in the nth iteration. Results of this paper can be used in theory research and engineering project of network confronting. © 2012 IEEE. Source

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