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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

作者： Zhang, Siyuan Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China China

ISBN: (纸本)9781479989522

?As a kind of renewable and clean energy, wind energy has been widespread concerned by countries around the world. Recently, the global wind power installed capacity is growing exponentially. ?Wind turbines will have a serious impact on Air Traffic Control (ATC) communication, navigation and surveillance systems due to the complex electromagnetic scattering properties.

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Analysis of the wind turbine RCS and micro-Doppler feature based on FEKO 15

Analysis of the wind turbine RCS and micro-Doppler feature b...

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2015 15th Annual Integrated Communication, Navigation and Surveillance Conference, ICNS 2015

作者： He, Weikun Ma, Yuzhao Shi, Yuluo Wang, Xiaoliang Zhang, Siyuan Wu, Renbiao Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781479989522

As a kind of renewable and clean energy, wind energy has been widespread concerned by countries around the world. However, it is shown that wind turbines will have a serious impact on Air Traffic Control (ATC) communication, navigation and surveillance systems due to the complex electromagnetic scattering properties. Therefore, analysis of the wind turbine Radar Cross Section (RCS) and micro-Doppler feature are of great significance. FEKO is a suit of professional electromagnetic analysis tool which has a large advantage of calculating the RCS of wind turbines and other electrically large objects. The RCS of wind turbines is calculated by FEKO, and the variability of wind turbine RCS with azimuth and elevation angles is analyzed in the paper. Meanwhile, in order to further present the micro-Doppler features of wind turbine echo, wind turbine echo is simulated based on FEKO and the characteristics of wind turbine echo in time domain, frequency domain and time-frequency domain are also analyzed, by which we reveal the micro-Doppler features of wind turbine caused by the rotation of wind turbine blades. The great agreement between simulation and real data confirms the validity of the FEKO simulation results in the paper. © 2015 IEEE.

关键词： Time domain analysis

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Wind turbine clutter mitigation based on matching pursuits

Wind turbine clutter mitigation based on matching pursuits

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IET International Radar Conference 2015

作者： He, Weikun Shi, Yuluo Wang, Xiaoliang Wu, Renbiao Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9781849199940

Wind turbines could have a serious impact on Air Traffic Control (ATC) radar system because of the complex electromagnetic scattering properties. In this paper, matching pursuit technology is studied to mitigate the wind turbines interference. Due to the large amount of calculation in the conventional MP algorithm, rotation rate of wind turbine and radar azimuth are firstly estimated based on the priori information, then matching pursuit algorithm is applied to mitigate the wind turbine clutter. Effectiveness of the proposed method is verified via simulation experiments.

关键词： Wind turbines

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Deterministic realization of collective measurements via photonic quantum walks

arXiv

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arXiv 2017年

作者： Hou, Zhibo Tang, Jun-Feng Shang, Jiangwei Zhu, Huangjun Li, Jian Yuan, Yuan Wu, Kang-Da Xiang, Guo-Yong Li, Chuan-Feng Guo, Guang-Can Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Naturwissenschaftlich-Technische Fakultät Universität Siegen Siegen57068 Germany Beijing Key Laboratory of Nanophotonics Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China Institute for Theoretical Physics University of Cologne Cologne50937 Germany Department of Physics Center for Field Theory and Particle Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

Collective measurements on identically prepared quantum systems can extract more information than local measurements, thereby enhancing information-processing efficiency. Although this nonclassical phenomenon has been known for two decades, it has remained a challenging task to demonstrate the advantage of collective measurements in experiments. Here we introduce a general recipe for performing deterministic collective measurements on two identically prepared qubits based on quantum walks. Using photonic quantum walks, we realize experimentally an optimized collective measurement with fidelity 0.9946 without post selection. As an application, we achieve the highest tomographic efficiency in qubit state tomography to date. Our work offers an effective recipe for beating the precision limit of local measurements in quantum state tomography and metrology. In addition, our study opens an avenue for harvesting the power of collective measurements in quantum information processing and for exploring the intriguing physics behind this power. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

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Runways detection based on scattering similarity and structural characteristics

Runways detection based on scattering similarity and structu...

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Integrated Communications, Navigation and Surveillance Conference, ICNS

作者： Ping Han Ling Chang Qingyan Shi Jingyi Qu Civil Aviation University of China Tianjin Key Lab for Advanced Signal Processing

➢ Airport is an important military and civilian facility. Its automatic detection is very necessary in many fields, such as military reconnaissance, precision strike, emergency rescue, aircraft navigation and so on. ➢... 详细信息

ISBN: (纸本)9781479989539

关键词： RUNWAY Structural properties false alarm probability Airport runways terrain classification broadcasting Scattering Taxonomy

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Analysis of the wind turbine RCS and micro-Doppler feature based on FEKO

Analysis of the wind turbine RCS and micro-Doppler feature b...

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Integrated Communications, Navigation and Surveillance Conference, ICNS

作者： Siyuan Zhang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

➢ As a kind of renewable and clean energy, wind energy has been widespread concerned by countries around the world. Recently, the global wind power installed capacity is growing exponentially. ➢ Wind turbines will have a serious impact on Air Traffic Control (ATC) communication, navigation and surveillance systems due to the complex electromagnetic scattering properties.

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A low-complexity spoofing detection and suppression approach for ADS-B

A low-complexity spoofing detection and suppression approach...

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Integrated Communications, Navigation and Surveillance Conference, ICNS

作者： Wenyi Wang Geng Chen Renbiao Wu Dan Lu Lu Wang Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

➢ Automatic Dependent Surveillance-Broadcast (ADS-B) is an Air Traffic Management (ATM) Surveillance system that is intended to replace traditional radar based system.

ISBN: (纸本)9781479989539

➢ Automatic Dependent Surveillance-Broadcast (ADS-B) is an Air Traffic Management (ATM) Surveillance system that is intended to replace traditional radar based system.

关键词： computer information security Spoofing Antenna arrays received signal Targets central element

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Interference Suppression with L1-norm Constraint for Satellite Navigation Systems

Interference Suppression with L1-norm Constraint for Satelli...

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第六届中国卫星导航学术年会

作者： Wenyi Wang Qingrong Du Renbiao Wu Dan Lu Lu Wang Qiongqiong Jia Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

Currently, there have been many studies of interference suppression for satellite navigation systems. Power minimization approach is an effective interference suppression algorithm. It forms automatically deep nulls in the DOAs(direction of arrival) of interferences without prior information about the DOAs of satellite signals and interferences. However, the power minimization approach can not provide flat gains in other directions. Thus there will be fluctuation in the beampattern, especially when the number of snapshots is not enough. It means that the desired satellite signal may be partly suppressed when they locate in the shallow nulls. In this paper, by combining eigenvalue thresholding method and l1-norm constraint, we propose a new interference suppression algorithm to suppress interferences and provide flat gains in all directions except that of interferences. The difference between the new algorithm and the conventional power minimization approach lies in the improvement of covariance matrix which is constituted based on the main eigenvalues and corresponding eigenvectors of covariance matrix. In addition, an explicit l1-norm constraint on the beam gains is exploited to provide flat gain in all directions except that of interferences. When there are interferences and spoofing, the spoofing is generally suppressed heavier than the authorized signal. It will decrease the power difference between the spoofing and authorized signals. Thus it will degrade the performance of subsequent spoofing detection. So the proposed algorithm also can be applied to the spoofing detection in satellite navigation systems. The simulations demonstrate the effectiveness of the proposed algorithm.

关键词： Satellite Navigation Flat Gains L1-norm Constraint Spoofing Interferences

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Satellite navigation anti-jamming algorithm based on extended array

Satellite navigation anti-jamming algorithm based on extende...

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第六届中国卫星导航学术年会

作者： Fusheng Li Wenyi Wang Dan Lu Lu Wang Qiongqiong Jia Renbiao Wu Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

In the complex electromagnetic environment, the Global Navigation Satellite System(GNSS) wasseriously influenced by the interference. The anti-jammingalgorithm based on the uniform array have been widely used in GNSS interference suppression technology, but the number of the interference is limited by the number of the antenna sensor. This paper proposed an interference suppression algorithm based on the extended array, the algorithm could suppress more interference than the number of antenna sensor. Firstly, the covariance matrix of the non-uniform array is vectorized. After that, the spatial smoothing is used to build up the rank of the covariance matrix. With the smoothed covariance matrix, power inversion algorithm is used to estimate the directions of the interference. Then, forming an overdetermined equation based on the interference subspace and an arbitrary signal's steering vector, whose direction is different form the interference. Finally, solving its least-squares solution to get the optimal weight, which can form nulls in the direction of interference without affecting the useful signal. The simulation results verify the effectiveness of the proposed algorithm.

关键词： Satellite navigation Extended array Spatial smoothing Least squares solution

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A High-dynamic Null-widen GNSS Anti-jamming Algorithm Based on Reduced-Dimension Space-Time Adaptive processing

A High-dynamic Null-widen GNSS Anti-jamming Algorithm Based ...

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第六届中国卫星导航学术年会

作者： Lu Ge Dan Lu Wenyi Wang Lu Wang Qiongqiong Jia Renbiao Wu Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

Space-Time Adaptive processing(STAP) is an effectivemethod to suppress interference in Global Navigation Satellite System(GNSS).But in high-dynamic environment, conventional adaptive anti-jamming algorithms are invalid since jammers may easily move out of the array pattern nulls. To solve this problem, a new null-widen method based on the Laplace distribution model is deduced in this paper, the method can get wider null at direction of *** this method is computationally intensive by using STAP, thus a new null-widen method based on reduced-dimension multistage wiener filters(MWF) is deduced here. It has proved in simulation section that the new method can get better performance in few snapshots.

关键词： STAP·null widening·MWF·High-dynamic·GNSS

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