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Air target recognition method against ISRJ for radio frequency proximity sensors using chaotic stream encryption

Defence technology（防务技术） 2023年第10期28卷 267-279页

作者： Jian-feng Li Jian Dai Xin-hong Hao Xiao-peng Yan Xin-wei Wang Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing100081China BIT Tangshan Research Institute Beijing100081China

The interrupted-sampling repeater jamming(ISRJ)can cause false targets to the radio-frequency proximity sensors(RFPSs),resulting in a serious decline in the target detection capability of the *** article proposes a recognition method for RFPSs to identify the false targets caused by *** proposed method is realized by assigning a unique identity(ID)to each RFPS,and each ID is a periodically and chaotically encrypted in every pulse *** processing technique of the received signal is divided into ranging and ID *** the ranging part,a high-resolution range profile(HRRP)can be obtained by performing pulse compression with the binary chaotic *** suppress the noise,the singular value decomposition(SVD)is applied in the *** ID decryption,targets and ISRJ can be recognized through the encryption and decryption processes,which are controlled by random *** adaptability analysis conducted in terms of the peak-to-side lobe ratio(PSLR)and bit error rate(BER)indicates that the proposed method performs well within a 70-k Hz Doppler shift.A simulation and experimental results show that the proposed method achieves extremely stable target and ISRJ recognition accuracies at different signal-to-noise ratios(SNRs)and jamming-to-signal ratios(JSRs).

关键词： Interrupted-sampling repeater jamming(ISRJ) Radio frequency proximity sensors(RFPS) Chaotic stream encryption Air target recognition Identity(ID)decryption

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Adaptive target and jamming recognition for the pulse doppler radar fuze based on a time-frequency joint feature and an online-updated naive bayesian classifier with minimal risk

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Defence technology（防务技术） 2022年第3期18卷 457-466页

作者： Jian Dai Xin-hong Hao Ze Li Ping Li Xiao-peng Yan Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing100081China

This paper considers the problem of target and jamming recognition for the pulse Doppler radar fuze(PDRF).To solve the problem,the matched filter outputs of the PDRF under the action of target and jamming are ***,the frequency entropy and peak-to-peak ratio are extracted from the matched filter output of the PDRF,and the time-frequency joint feature is *** on the time-frequency joint feature,the naive Bayesian classifier(NBC)with minimal risk is established for target and jamming *** improve the adaptability of the proposed method in complex environments,an online update process that adaptively modifies the classifier in the duration of the work of the PDRF is *** experiments show that the PDRF can maintain high recognition accuracy when the signal-to-noise ratio(SNR)decreases and the jamming-to-signal ratio(JSR)***,the applicable analysis shows that he ONBCMR method has low computational complexity and can fully meet the real-time requirements of PDRF.

关键词： Pulse Doppler radar fuze(PDRF) Target and jamming recognition Time-frequency joint feature Online-update naive Bayesian classifier minimal risk(ONBCMR)

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Strength Calculation and Simulation Study of Threaded Connection of Penetration Fuze 5

Strength Calculation and Simulation Study of Threaded Connec...

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5th International Seminar on Artificial Intelligence, Networking and Information technology, AINIT 2024

作者： Xu, Pengzhao Ma, Guangsong Wang, Sen Cui, Shaokang Science and Technology On Electromechanical Dynamic Control Laboratory Xi'an710065 China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

ISBN: (纸本)9798350385557

Aiming at the problem of whether the connection strength of the thread of the penetration fuze is sufficient the operating requirements under the impact load of penetrating multi-layer target plate. Using theoretical calculation and numerical simulation methods, under three different excitation conditions (axial, axial + radial (0.3 times axial), axial + radial (0.6 times axial)) under the impact load of the multi-layer target plate, the shear strength of the thread connecting the screw and the fuze shell and the extrusion strength of the thread tooth surface were studied. The results show that the design margins under the three excitation conditions are 0.9, 0.6 and 0.1, respectively, and all have certain design margins, indicating that the connection thread of the fuze meets the strength requirements when subjected to the impact load of the penetrating multilayer target plate. © 2024 IEEE.

关键词： Numerical methods

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A Power Supply Method for Detonation control Module with Threshold of Opening and Closing Voltage 7

A Power Supply Method for Detonation Control Module with Thr...

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7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Liu, Pu Xu, Tengfei Zhang, Kang Xi'an Institute of Electromechanical Inforation Technology Science and Technology on Electromechanical Dynamic Control Laborator Xi'an China

ISBN: (纸本)9798350384437

Aiming at the shortcomings of power supply circuit composed of energy storage capacitor and ordinary linear voltage regulator, such as slow power down and input voltage fluctuation affecting output voltage, a power supply method for detonation control module with threshold of opening and closing voltage is proposed. In this method, a 3.3V linear regulator with threshold value of opening and closing voltage is introduced, which is realized by combining energy storage capacitor and 5V linear regulator. Set the starting and closing voltage threshold to control the enabling pin of 3.3V linear voltage regulator by using resistance voltage divider. When the input voltage rises to the starting voltage, the regulator will start quickly and keep the output voltage stable. When the input voltage drops to the closing voltage value, the output voltage of the voltage regulator will power down quickly. The 3.3V linear regulator with opening and closing voltage threshold significantly reduces the time that the output voltage follows the input voltage during power on and power off, and effectively reduces the impact of input voltage jitter on the output voltage. The verification results show that the speed of powering on and powering off of the circuit developed by the power supply method can meet the power supply requirements of the detonating control module, and the power supply voltage is stable, which can effectively reduce the risks of program runaway and "crash"during powering on and powering off of the microcontroller. © 2024 IEEE.

关键词： Detonation

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Consensus Positive Position Feedback Robust control for Vibration Reduction Under Fault Tolerance 2

Consensus Positive Position Feedback Robust Control for Vibr...

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2nd International Conference on Artificial Intelligence and Automation control, AIAC 2024

作者： Tian, Dalong Xue, Dong Li, Yuwei Shen, Hang Xue, Jiamin Du, Han Xi'an Institute of Electromechanical Information Technology Xi'an710065 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China

ISBN: (纸本)9798331529147

In this study, active vibration robust control based on the mutual collaboration of agents under fault tolerance for large flexible smart truss structures (LFSTS) is investigated. First, the electromechanical coupling dynamic equation of the active truss is analyzed based on the finite element method. Subsequently, the positive position feedback (PPF) and consensus positive position feedback (CPPF) algorithms are compared, analyzing the reduction of the vibration relying on the optimal PZT stack actuator's position when agents collaborate in the designed communication topology network. Finally, simulations considering agent failure are performed to verify the fault tolerance and robustness of the active vibration control system. Compared with free vibration and PPF method, the results show that CPPF exhibits robust performance in rapidly suppressing the vibration of the LFSTS, which considerably enhances system reliability and improves pointing accuracy. © 2024 IEEE.

关键词： Large scale systems

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Application of 3D Gaussian Splatting target Reconstruction in short-range detection 4

Application of 3D Gaussian Splatting target Reconstruction i...

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4th International Conference on Defence technology, ICDT 2024

作者： Lou, Wenzhong Li, Chenglong Feng, Hengzhen Ding, Nanxi Zhang, Zihao Ma, Wenlong Wang, Lin Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China

The research presented in this paper successfully introduces the emerging 3D reconstruction technology to specific application scenarios, especially for the strict requirements of information authenticity and timeliness for reconnaissance equipment and platforms. Traditional methods have the problems of slow speed and damaged reconstruction quality in processing reconnaissance information. In order to solve the problem of limited computing power of aerial detection platform and improve the reconstruction quality and efficiency of complex scenes, this paper introduces three-dimensional Gaussian Splatting (3DGS) method for testing. Experimental results show that 3DGS has excellent performance in rendering accuracy and real-time performance, which can effectively meet the performance requirements of aerial detection platforms. We tested it on a virtual dataset, and the experimental results show that it can also maintain excellent performance in the real world. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： 3D modeling

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Orthogonal simulation and experimental study on SLM process parameters for micro-sized high dynamic components 4

Orthogonal simulation and experimental study on SLM process ...

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4th International Conference on Defence technology, ICDT 2024

作者： Lv, Sining Lou, Wenzhong Feng, Hengzhen Xiao, Chuan Li, Shiyi Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing China

Metal Additive Manufacturing (MAM) technology has become an important means of rapid prototyping of special high dynamic complex components. This study employs selective laser melting (SLM) as a technological approach for investigating micro-sized high dynamic components. The parameters that affect SLM process are analysed, mainly including laser power, laser speed, laser diameter, and scan spacing. Based on prior studies, feasible parameter ranges are identified, and an orthogonal experimental design table is established for simulation and experimental co-verification. Range and variance analysis are conducted and the influence ability of each influencing factor is explored from both simulation and experimental aspects. The SLM process model is established using finite element software, taking into account parameters such as residual stress and maximum deformation. The conclusion is drawn that the order of influence of each factor on the preparation of micro-sized high dynamic components is: scan spacing>laser power>laser diameter> laser speed. Samples of components are fabricated and subjected to static testing. The density of the components can reach over 99.15%, and the structural strength can reach 348 MPa, which meet the required standards and confirm the simulation analysis. The results demonstrates that SLM provides a novel manufacturing method for micro-sized high dynamic components. © 2024 Published under licence by IOP Publishing Ltd.

关键词： Selective laser melting

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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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Research on Numerical Simulation of the instantaneity of a Mechanical Impact Fuze 4

Research on Numerical Simulation of the instantaneity of a M...

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4th International Conference on Defence technology, ICDT 2024

作者： Yang, Shanglin Wang, Yabin Luan, Donglin Guo, Pengda School of Mechatronical Engineering Beijing Institute of Technology Beijing China Science and Technology on Electromechanical Dynamic Control Laboratory China

The instantaneity of a fuze refers to the time interval between the projectile's impact on the target and the completion of detonation. This parameter is a critical indicator for evaluating the performance of ammunition. To investigate the factors influencing instantaneity, a numerical simulation was conducted on the process of a projectile striking a target under different conditions, including impact angle, fuze material, and target material. The simulation results, under 12 different conditions, produced acceleration curves and instantaneity for the firing device. Through the analysis of the results, the study establishes key design principles for the firing device of the fuze: the protection design of the ignition device and the selection of the ignition strategy should consider the maximum and minimum impact angles and target hardness. Choosing an ignition device with a low structural strength or a fuze body material with lower hardness and strength can enhance the fuze's instantaneity The target hardness and impact angle greatly affect the fuze's instantaneity of the fuze, and appropriate structural strength should be selected in the design. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Projectiles

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Research on the performance optimisation method of linear array infrared detector based on pixel decomposition 4

Research on the performance optimisation method of linear ar...

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4th International Conference on Defence technology, ICDT 2024

作者： Hu, Shiyuan Wu, Yanjiang Si, Xinlu Han, Shaorong Chen, Huimin Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Xi'an Institute of Electromechanical Information Technology Xi'an710065 China

Facing the background of proximity detection applications, this paper proposes an optimisation method based on pixel decomposition to improve the detection performance in view of the strong dark current and blind pixel rate problems brought by the increase of pixel size. By establishing the linear array infrared detection model, the influence of pixel size on detector system dynamic range, noise equivalent temperature difference, spatial resolution and other performance parameters is obtained. Based on the idea of pixel decomposition, a suitable resolution is chosen to decompose a large-size pixel, and the photoelectric conversion process of each sub-pixel is equated. The simulation verifies that the proposed optimisation method of the pixel decomposition improves the detection signal-to-noise ratio. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Infrared detectors

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