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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wen, Yongdiao Li, Gang Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9798350375909

Herein, a dual-functional terahertz (THz) metamaterial device is presented, the proposed device consists of two heteromorphic arrows, which can switch freely between absorption and polarization conversion controlled by a singular switch. The absorptivity peak (arounds 1.5 THz) and polarization conversion peak (arounds 2.8 THz) will be changed to polarization conversion peak and absorptivity peak with the state of the singular switch, the absorption function and the polarization conversion function can adjust and convert each other, and the maximum values of absorption rate and polarization conversion rate reach to 87.27% and 95.94% respectively. © 2024 IEEE.

关键词： Polarization

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Anti-jamming Method of Radio Fuze Based on KNN 4

Anti-jamming Method of Radio Fuze Based on KNN

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4th International Conference on Intelligent control, Measurement and Signal Processing, ICMSP 2022

作者： Liu, Bing Hao, Xinhong Yang, Jin Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (数字)9781665486583

ISBN: (纸本)9781665486583

In order to improve the anti-jamming ability of radio fuze and maximize the effectiveness of radio fuze in complex electronmagnetic environments, it is necessary to distinguish targets and jamming signals effectively. This research takes a sample of FM radio fuze as an example, mainly considers the sine amplitude modulation frequency-sweeping (Sine-AM) jamming signal and noise amplitude modulation frequency-sweeping (Noise-AM) jamming signal, which are pose the greatest threat to the FM radio fuze. The frequency exponential entropy and norm entropy of the fuze output signal are extracted. Then these features are input to K nearest neighbors classifier, in this way, the target signals and jamming signals can be effectively distinguished, Further improved the FM radio fuze ability to anti-jamming signal. The expermient result shows that using KNN classifier can get a classification accuracy more than 99%. © 2022 IEEE.

关键词： Amplitude modulation

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Research on a projectile-borne measuring apparatus for electromagnetic launcher 4

Research on a projectile-borne measuring apparatus for elect...

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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Cao, Ronggang Hu, Xueyi Dong, Erwa Ma, Xiao Zhou, Yu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

In order to evaluate the electromagnetic launch effectiveness and understand the corrosion damage of the electromagnetic launcher, it is necessary to master the magnetic field data in the bore. At present, there is no related research on the measurement of the bore magnetic field of the electromagnetic launcher. Therefore, a small-scale projectile-borne measuring apparatus based on B-dot probe is developed in this paper. This apparatus uses FPGA as the core. Through the static magnetic field measurement experiment, the data of the induced voltage and the induced magnetic field can be obtained. The projectile-borne magnetic field measuring apparatus designed in this paper can accurately measure the bore magnetic field of the electromagnetic launcher, which lays the foundation for further analysis of the influence of the electromagnetic field in the bore on the launch effect and investigation of the corrosion damage of the electromagnetic launcher. © Published under licence by IOP Publishing Ltd.

关键词： Projectiles

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Application of Ulaby Model in Simulation of Altimeter Fuze 13

Application of Ulaby Model in Simulation of Altimeter Fuze

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Gao, Sicheng Li, Tie Li, Wei Tian, Bo Science and Technology on Electromechanical Dynamic Control Laboratory Shaanxi Xi'an710061 China

ISBN: (纸本)9781665418126

In order to solve the problem that the application mechanism of scattering information of background of surface features in the design process of altimeter fuze is not clear, a simulation method of altimeter fuze based on Ulaby model is proposed. This method is based on the Ulaby model to model the target characteristics of background of surface features. The target characteristics information is used as the input information of fuze detection in the missile target encounter process, adopting the digital signal processing method. The response characteristic model of fuze target detection is established, and the response simulation of fuze detection to the time-varying scattering characteristics of background of surface features in the process of missile target encounter is carried out, and the response characteristics of echo and IF signal processing are clearly reproduced. The experimental results show that Ulaby model can be used to distinguish different background of surface features types. The target type information is added as another dimensional fuze detection information, and the detection accuracy is further improved by combining the height information. © 2021 IEEE.

关键词： Digital signal processing

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Numerical simulation of the delay arming process of initiating explosive brakes

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Journal of Beijing Institute of technology 2015年第1期24卷 4-7页

作者：王茹王亚斌 National Key Laboratory on Electromechanical Dynamic Control School of Mechatronic EngineeringBeijing Institute of Technology

The delay arming process of initiating explosive （ IE ） brakes for fuse is complex and hard to be verified. A numerical simulation model of IE brakes was established based on the arbitrary La- grange-Euler method. The model included the structure, the air filed, etc. The simulation boundary conditions were defined, including the contacts, blasting parameters of the explosive and the fluid- solid coupling interface. The simulation results show that the shear pin of the chosen IE can be cut off. When the piston needs to move 0.8 cm, the time set to the delay arming of the IE brakes model is about 40μS. The maximum displacement of the piston is 1. 17 cm. The model provides basis for parameters design and further improvement of IE brakes.

关键词： initiating explosive brakes numerical simulation ALE delay arming

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An Overall Weighted Fusion Algorithm Based on dynamic Optimal Estimation

An Overall Weighted Fusion Algorithm Based on Dynamic Optima...

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2023 IEEE International Conference on control, Electronics and Computer technology, ICCECT 2023

作者： Wang, Zehu He, Guanglin Liu, Yukuan Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China

ISBN: (纸本)9798350399028

Based on the background of cooperative detection of target by multiple UAVs, this paper proposes an efficient multi-sensor data fusion algorithm, which is called the overall weighted fusion algorithm based on dynamic optimal estimation (abbreviated as DOE-OWFA) Based on the weighted fusion by the least squares method, the algorithm makes full use of the state estimation property of Kalman Alter for data processing and state estimation. In order to evaluate the performance of the algorithm, we conducted simulation tests with the help of MATLAB. The simulation results show that the algorithm proposed in this paper has higher fusion accuracy and better robustness compared with the same type of algorithms. © 2023 IEEE.

关键词： State estimation

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Anti-jamming Method of FM Fuze Based on Deep Learning 4

Anti-jamming Method of FM Fuze Based on Deep Learning

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4th International Conference on Defence technology, ICDT 2024

作者： Zhang, Jin-Yu Yan, Xiao-Peng Hao, Xin-Hong Zhang, Jin-Cheng Science and Technology on Electromechanical Dynamic Control Laboratory China Beijing Institute of Technology China

In response to the challenges posed by sweeping jamming and Digital Radio Frequency Memory (DRFM) jamming in Frequency Modulation Continuous Wave (FMCW) fuzes, a jamming mitigation method based on deep learning method is proposed in this paper. Initially, the target beat frequency signal data affected by sweeping jamming and DRFM jamming is gathered and analysed using the Transformer method. A comparison is made between the classification and recognition outcomes of Transformer model and Support Vector Machine (SVM) methods to identify the optimal model. Subsequently, the feature information of the echo signal under interference is extracted using Empirical Mode Decomposition (EMD) decomposition, and the target features are reconstructed. Experimental results utilizing simulated data confirm that the proposed method achieves a classification accuracy of 92% and ensures that the fuze detonation distance remains within the pre-set 9 m range. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Support vector machines

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Near-field Echo Signal Model of Ground Background Based on Scattering Distribution Function 13

Near-field Echo Signal Model of Ground Background Based on S...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Tian, Bo Li, Tie Hu, Wenhui Gao, Sicheng Science and Technology on Electromechanical Dynamic Control Laboratory Shaanxi Xi'an710061 China

ISBN: (纸本)9781665418126

Aiming at the problem that the traditional millimeter wave proximity detector model using backscattering coefficients has a large height setting error when the background echo signal quality is poor and the signal-noise ratio is insufficient, a near-field millimeter wave echo signal model based on scattering distribution function for complex feature background is proposed. The model is optimized as an upper half-space scattering distribution function based on the characteristics of feature types to study the near-field scattering functions of soil, vegetation and other backgrounds, and the scattering signals of each microscattering unit in the irradiated area of the detector beam at different moments are calculated in real time by combining with the missile target encounter model, and the echoes received at the detector are obtained in real time after integration. The simulation results show that compared with the traditional method, the model can meet the requirements of detection simulation with higher accuracy of background echo calculation under the condition of lower signal-noise ratio. © 2021 IEEE.

关键词： Distribution functions

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Feature Extraction and Recognition of Typical Targets by Linear Array LiDAR 2

Feature Extraction and Recognition of Typical Targets by Lin...

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2nd International Conference on Intelligent Computing and Human-Computer Interaction, ICHCI 2021

作者： Huo, Jian Yang, Xu Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory Beijing China

ISBN: (纸本)9781665407649

Aiming at solving the problem that the precision of existing algorithms for sparse point cloud image is unsatisfactory, a target recognition algorithm based on the combination of target shape characteristics and LiDAR echo intensity is proposed. By analyzing and processing the linear array scanning data of the target, remove the ground point cloud by using the point cloud elevation information histogram and the adaptive threshold method of the number of point clouds. On this basis, the mathematical morphology algorithm is used to filter the typical nontarget objects. Finally, the algorithm combining the target shape characteristics and echo intensity is used to realize the accurate recognition of the target. The results show that the algorithm is efficient and easy to implement, and has a good recognition effect on sparse point cloud targets. © 2021 IEEE.

关键词： Optical radar

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Strong Electromagnetic Protection Circuit for RF Front End of Autodyne Radio Fuze 13

Strong Electromagnetic Protection Circuit for RF Front End o...

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13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Wang, Cheng Chen, Wei Wen, Rui-Hu Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Electromechanical Information Technology Research Institute China

ISBN: (纸本)9781665418126

In order to solve the problem that the RF front end of autodyne radio fuze is weak in resisting high-power and energy-based jamming, a design method of electromagnetic protection circuit for RF front end is proposed. The method is to add an electromagnetic protection circuit composed of microwave limiter, RF band-pass filter, and single pole double throw switch, which between RF front-end circuit and transceiver antenna of the autodyne radio fuze. The electromagnetic protection of RF front-end core high-frequency devices is carried out by means of excess energy attenuation, selection of passing frequency, and transmission channel locking. Experimental verification shows that the electromagnetic protection circuit can protect the RF front end of the Autodyne radio fuze in both the frequency domain and the time domain, and improve the survivability of the fuze in the high EM environment. © 2021 IEEE.

关键词： Microwave limiters

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