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检索条件"机构=National Key Laboratory of Science and Technology on Test Physics and umerical Mathematics"

共 319 条记录，以下是81-90 订阅

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Deep representation method for radar emitter signal using wavelet packets decomposition

Deep representation method for radar emitter signal using wa...

引用

IET International Radar Conference 2018, IRC 2018

作者： Cao, Yang Bai, Jin Liang Li, Hongbo Zhao, Jian Liu, Shuo Gao, Zhiyong National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China School of Electronics and Information Engineering Harbin Institute of Technology Harbin China

Signal representation is to transform the intercepted original signal into feature parameters, which is the basis for the electronic reconnaissance system to analyse and identify a radar. The traditional method is to manually design a limited number of features with prior knowledge, which can only achieve the desired results in specific applications. Therefore, it is necessary to study signal representation methods that are more adaptable, reasonable, and effective. This study proposes a feature-level design scheme that extracts multi-level signal feature parameters to obtain deep essential feature representations, which is consistent with deep-learning frameworks. Through the decomposition through wavelet packet transform (WPT), the best sub-band tree structure of the signal can be obtained, and the depth representation of the signal can be well achieved, which can meet requirements of time-frequency analysis automatically. Here, Symlets wavelet packet decomposition (WPD) is used as an example to implement multi-layer signal feature representation. The combination of characteristic parameters at different levels can reflect the different information contained in different radar signals. The simulation results show that the method can effectively identify the modulation mode of radar signals and enhance the information mining ability from radar signals. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Radar

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Suppressing the effects of ionospheric scintillation on geosynchronous SAR by optimised orbit design

Suppressing the effects of ionospheric scintillation on geos...

引用

2017 International Conference on Radar Systems, Radar 2017

作者： Li, YuanHao Liu, XiangRong Hu, Cheng Dong, XiChao School of Information and Electronics Beijing Institute of Technology 100081 China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics 100076 China Beijing Key Laboratory of Embedded Real-time information Processing Technology 100081 China

ISBN: (纸本)9781785615153

An L band geosynchronous synthetic aperture radar (GEO SAR) will be sensitive to ionosphere scintillation because of its low carrier frequency. Meanwhile, because of the high orbit, GEO SAR has a higher probability to meet ionospheric scintillation. In this paper, we propose an orbit strategy for eliminating the impacts of ionospheric scintillation. It is realized by selecting a proper orbit element (time past perigee) to avoid imaging for the sensitive region of ionospheric scintillation during the eruption time interval of ionospheric scintillation with the highest probability. Finally, the simulation based on systems tool kit (STK) software was conducted to verify the effectiveness of the method. © 2017 Institution of Engineering and technology. All rights reserved.

关键词： Synthetic aperture radar

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Periodic Structures and Its Interaction to EM Wave Spectrum, Ideas From X-Ray to MW Wave

Periodic Structures and Its Interaction to EM Wave Spectrum,...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Tang, Yunhui Gao, Lu Wang, Ruzhi Zhang, Shengjun Song, Hang Zhang, Yuning Ai, Xia Xie, Lei Jiao, Luting Zhang, Xiaoling He, Jing Liu, Jiaqi Beijing University of Technology Beijing China National Key Laboratory of Science & Technology on Test Physics and Numerical Mathematics Beijing China Beijing Institute of Space Long March Vehicle Beijing China

ISBN: (纸本)9781665452366

X-ray is an important tool for characterizing materials, which is based on the idea that all crystals are composed of atoms or molecules stacking in a particular type, basically expressing as unit cell, diffracting the incident ray with a proper type. In analogue, the periodic structures which are mostly constructed artificially show special desired properties, such as the properties of grating, frequency selective surfaces, metamaterials and metasurface. In this paper, A study was done on the insight of the relation of wave interaction with periodic structures based on X-ray diffraction and control of electromagnetic waves. © 2022 IEEE.

关键词： Periodic structures

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Real-Time Path Planning based on the Lock Loss Model

Real-Time Path Planning based on the Lock Loss Model

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Luo, Xun Liu, Li Liu, Xin National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China China Academy of Launch Vehicle Technology Beijing China

ISBN: (纸本)9781665452366

A new method of aircraft low altitude penetration is proposed with temporal constraints that allow periods of high observability interspersed with periods of low observability. The aircraft's RCS character is simplified into the 'bow-tie' distribution, then the aircraft can dynamically adjust its yaw angle to minimize the risk from the radars. According to the modified Lock Loss model and the TWS(Track While Scan) radar work flow, and real-time evaluating model on the original path, a fast real-time path planning method is present on the situation that unexpected threats occur. An example of real-time path planning is given. © 2022 IEEE.

关键词： Locks (fasteners)

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An Improved DSDV Protocol based on Link Stability with Adaptive Period for Intra-cluster Routing in High-dynamic Flying UAV Networks

An Improved DSDV Protocol based on Link Stability with Adapt...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Zhang, Yiguo Qian, Lai Xue, Xiaoqin Wang, Wei Xi'an Polytechnic University College of Computer Science Xi'an China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing Institute of Space Long March Vehicle Beijing China

ISBN: (纸本)9781665452366

We propose a stability-based adaptive-period DSDV intra-cluster routing protocol that automatically adjusts the routing update period by the link stability among the nodes in the cluster structure, thus reducing the network overhead of the network structure in maintaining the routing table. We describe the link stability and adaptive period implementation and test the proposed routing protocol in the cluster structure based on network simulation. The implementation results show that the proposed routing protocol has better performance than the traditional DSDV routing protocol, can improve the network throughput and reduce the routing overhead in the network, and has good adaptability in the cluster with fast changing network topology. © 2022 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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Automatic MHT Method Based on Target Characteristics Applied in the Small Space Targets

Automatic MHT Method Based on Target Characteristics Applied...

引用

2018 3rd International Conference on Design, Mechanical and Material Engineering (D2ME 2018)

作者： Qian ZHAO Zhenhong NIU Lian XUE Xin LIU Jianhua LI Zhifeng LI National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics

The Multi-Hypothesis Tracking(MHT) method is one of the most promising approaches to realize automatic tracking of small and dim targets in complex space ***,the number of hypotheses generated by this algorithm has an exponentially increasing relationship with the number of trajectories,measurement data,and the number of image *** the paper,the automatic detection and tracking method of judging the confidence coefficient of the trajectory obtained by the MHT which is based on the characteristics of dim targets,has been realized in the IRST *** performance of this method is greatly improved.

关键词： image Automatic MHT Method Based on Target Characteristics Applied in the Small Space Targets MHT Target

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Pulse Phase Modulation for On-Off Thruster Pair

Pulse Phase Modulation for On-Off Thruster Pair

引用

IEEE Aerospace Conference

作者： Runle Du Jiaqi Liu Li Zhang Lu Gao National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics

ISBN: (纸本)9781479916191

On-Off thrusters have limitation both at minimum on-time and minimum off-time, so the output is nonlinear pulses. Use on-off thrusters to provide linear or near linear control force is a fundamental and important research topic. Existing previous works do not overcome the limitation of on-time and off-time constraints, so the output is only an approximation of demanded force output. In this paper, Pulse Phase modulation (PP) is proposed to generate linear output through on-off thruster pair. PP modulation exploited the dynamic output curve of thrusters. By adjusting phase difference of thruster pair that installed in the opposite direction, thrust output can be linear proportional to demanded force output. PP modulation breaks the limitation caused by minimum on-time and off-time, and thus achieves high continuity of thrust output. For practical engineering implementation, two approximate methods are proposed as double frequency phase modulation and quadruple frequency phase modulation. Theoretical analysis and experimental results are provided to prove that PP modulation can yield much better precision in stabilizing space vehicles.

关键词： THRUSTER phase modulation on-off Punctuality phase difference Output off time Time constraints Polypropylenes Space vehicles Pairing

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Research on Heterogeneous Parallel Algorithms for Radar Signal Processing in OpenCL Platform

Research on Heterogeneous Parallel Algorithms for Radar Sign...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Wang, Yingfei Xue, Xiaoqin Wang, Wei Xi'an Polytechnic University Department of Computer Science Xi'an China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781665452366

An efficient radar signal processing parallel algorithm for Open Computing Language (OpenCL) is presented in this paper, which reveals a rational allocation schema of tasks between the central processing unit (CPU) and the graphics processing unit (GPU). The powerful parallel processing ability of GPU is used to replace the traditional serial processing method by the way of pipeline acceleration and algorithm parallel acceleration, and the real-time performance of the proposed algorithm is improved by the design idea of intra-module parallelism and inter-module flow processing. The algorithm is applied to CPU-GPU heterogeneous computing platform and has a good portability. The effectiveness and real-time performance of the algorithm are verified through simulation data. © 2022 IEEE.

关键词： Graphics processing unit

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The Design of Large Arc-shape High-precision Walking Device in TV(thermal-vacuum) Conditions

The Design of Large Arc-shape High-precision Walking Device ...

引用

2018 3rd International Conference on Design, Mechanical and Material Engineering (D2ME 2018)

作者： Xue Lian Nan Hua Liu Jiaqi Liu Xin Meng Gang National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics

The large-sized space environmental simulation test facility is mainly used for providing thermal radiation environment in high-vacuum,cold and dark space for satellites,spacecraft,lunar spacecraft to carry out whole satellite thermal vacuum test and for large equipment like antenna to carry out tests in TV *** the spacecraft's surface optical image or temperature is a main task in space environment simulation *** previous tests,optical image test mainly took place in a fixed position,so the measuring location and angle are *** paper focuses on large spherical space environmental simulation test facility,and designs a large arc-shape high-precision walking device in a space environment simulation test *** introduces key technology in detail like structure design,thermal design,processes and manufacturing,*** test results show that this device can work steadily and reliably under simulation space environments,and the precision exceeds 0.5.

关键词： thermal-vacuum Conditions The Design of Large Arc-shape High-precision Walking Device in TV Arc

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Optimal Selection of regularization parameter for ?1-based image restoration based on SURE

Optimal Selection of regularization parameter for ?1-based i...

引用

International Symposium on Optoelectronic technology and Application 2016(OTA 2016)——Conf.12 Infrared technology and Application

作者： Feng Xue Xin Liu Hongyan Liu Jiaqi Liu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics

In real applications of infrared imaging and remote sensing, the observed images are often blurry and noisy due to the limitations of acquisition system. This degradation is often mathematically formu

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