Modern Defense Technology

The War Case Cracking and Research of Yugoslavia Shooting Down the F-117A Stealth Aircraft

HU Xiao-lei, YIN Da-hu, JIN Jian-wei

2020, 48(4): 1-7. doi:10.3969/j.issn.1009-086x.2020.04.01

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The Yugoslavia air defense forces shot down the F-117A stealth aircraft was the world’s first and so far the only successful war case of shooting down stealth craft.The war case is still of great practical value to the study of air defense tactics.The methods of open source intelligence analysis and simulation are used to restore the battle history with data details.The research conclusion is highly reliable and consistent which was supported by corresponding evidence.

Design of Flying-Jumping Integrated UAV

XU Hao-tong, ZHAI Xin-die, YAN Hao-an, ZHU Yue, HUANG Tian-hao

2020, 48(4): 8-15. doi:10.3969/j.issn.1009-086x.2020.04.02

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In indoor anti-terrorism combats,a single-mode unmanned aerial vehicle (UAV) cannot adapt to complex terrain and is easily destroyed.Aiming at this problem,a small UAV which can bounce on the ground-Scyther, is proposed.The composition,structure and main parameters are firstly given.Then,the main algorithms are explained,and the feasibility of the scheme is analyzed.A combination of coaxial twin-rotor and jumping UAV are used on Scyther.When approaching the target,the coaxial twin-rotor pops up from the main body and sticks to the high position.The camera mounted on it provides a monitoring field of view.The attitude of UAV is controlled through the momentum wheel,whose path is planned using improved ant colony algorithm.Using distributed context-aware algorithm,the UAV’s trajectory will be difficult to predict within the enemy’s visible range,thereby increasing the probability of getting close to the target.Compared with traditional UAVs,Scyther can adapt to a variety of complex terrains,can be controlled remotely, and has the advantages of small size,fast speed,low power consumption,and strong maneuverability.It is suitable for both single and cluster combats,thus is very beneficial for indoor anti-terrorism combats.In addition,Scyther can be equipped with a variety of warheads for different mission requirements,and is applicable for extensive scenarios.

“Bee Catching”: System Conception of Air Short Range Anti-UAV Bee Colony

LI Jing-jing, LUO Chen-xu, HUANG Wei

2020, 48(4): 16-22. doi:10.3969/j.issn.1009-086x.2020.04.03

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Based on the characteristics of unmanned aerial vehicle′s (UAV′s) “bee colony” technology and combat,a low-altitude short-range anti-UAV system concept based on multi-layer defense idea is proposed to solve the problems of traditional air defense system to the UAV’s “bee colony”,such as the close detectction distance,the poor interception effect and the incapable of attacking its launch platform.It is envisaged that the new anti-UAV missiles,laser weapons,the “bee catcher” UAVs,radio jamming equipments and a variety of detection sensors will be integrated into the existing air defense system to improve its defense capability against low-altitude,small,slow and group targets.The scheme of the combat system has certain innovation and applicability,which can provide a reference for the development and improvement of the future anti-UAV system to a certain extent.

Research on the Conceptual Design of Spinning Tricopter

LI Ze-bo, HUANG Ge-ying, WANG Yi-xuan, FANG Chao-ming, WANG Yi-xiao, LI Bo-wen

2020, 48(4): 23-28. doi:10.3969/j.issn.1009-086x.2020.04.04

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According to the future development of unmanned aerial vehicle (UAV),a new spinning flight mode is proposed,and a spinning tricopter with a highly simplified structure is designed.During the flight of the spinning tricopter,the torque generated by the rotation of the rotor in the same direction drives the fuselage to spin in the opposite direction,which generates additional lift at the wings while achieving better stability.The conceptual design of the spinning tricopter is introduced,the principle of spinning flight mode is analyzed,and its feasibility is demonstrated.Based on this new flight mode,a five-degree-of-freedom spin flight control method is proposed,and the outlook of its possible application is provided.

Type Recognition of the Aerial Target Method Based on Vague Sets Weighted Distance

SONG Bao-jun, FENG Hui

2020, 48(4): 29-33. doi:10.3969/j.issn.1009-086x.2020.04.05

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Considering the proposed aerial targets type recognition is not fully ideal,a new method of aerial targets type recognition based on vague sets is presented.Weight calculation of targets type characteristic parameter is offered,which can avoid subjective deviation resulted from expert evaluation method availably.Based on aerial targets type recognition standard,a weighted Vague distance function and mathematical model of aerial targets type recognition are established by multiple-attribute fuzzy decision theories.Finally,via an example,the result of the method is proved to be correct.The proposed method is valuable for the commander’s decision making.

Research on Operational Architecture Modeling of Space-based Maritime Reconnaissance and Surveillance System

WAN Min, HOU Yan, WANG Qian

2020, 48(4): 34-43. doi:10.3969/j.issn.1009-086x.2020.04.06

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The space-based maritime reconnaissance and surveillance system is an important source of information for far-sea operations,coastal defenses,precision attacks and other maritime operations,and it is an important force to support and win modern naval warfare.On the basis of describing the composition and function of space-based maritime reconnaissance and surveillance system,the operational process of the system is given based on observe-orient-decide-act (OODA) operation theory.At the operational application level,from the operational viewpoint,based on department of defense architecture framework (DoDAF),the modeling steps of the operational architecture of space-based maritime reconnaissance and surveillance system are given,and the relevant models are established.The research results can provide reference for operational application research and top-level design of space-based maritime reconnaissance and surveillance system.

Research on the Operational Structure and Concept of Unmanned Aerial Swarm

YANG Li-na, CAO Ze-yang, LI Yong-xiang

2020, 48(4): 44-51. doi:10.3969/j.issn.1009-086x.2020.04.07

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Based on the research of the structure and process of unmanned aerial swarm operation,by means of words and figures,four operational concepts that can exist in the future unmanned aerial vehicle (UAV) operations are conceived,namely,to the ground,to the air,to the sea and to the city,as well as possible operational tasks and operational patterns in operations,on which the key technologies of UAV system for completing combat task are analyzed,in order to provide reference for the demonstration and development of UAV equipment.

Research on the Impact Influence of the Jet Flow in the Vertical Container Missile Launching Process

LAN Ren-en, MA Yan-li, LIU Huan-xing

2020, 48(4): 52-59. doi:10.3969/j.issn.1009-086x.2020.04.08

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To research the jet flow influence on the missile and launch equipment of the container launching process,the computational fluid dynamic was used,and the jet flowfield and the missile motion were coupling computed.The zone moving and dynamic laying method was used to simulate the missile motion,and the species frozen model was used to simulate the flowfield.The thermal and impact load of the missile launching process were obtained,and contrasted with the experimental data.The results show that,the missile pressure was negative when the missile was in the container,and the pressure increased to an atmospheric pressure when the monitor surface moved out of the container.The missile bottom suffered a temperature apex of 775 K,and the missile surface temperature retained 300 K during the missile motion process.The temperature of the container increased when the missile was in the container and decreased when the missile was out of the container.The temperature increased before the supercritical location and then decreased along with the missile moves far away from the container.The pressure was negative when the missile was in the container,and achieved minimum when the nozzle moved to the monitor,and increased later.The container pressure decreased to the trough when the supercritical location and the pressure increased to an atmospheric pressure when the monitor surface moved out of the container.

Key Technology Analysis and Development Enlightenment of Advanced Air Defense Missile

CHEN Hai-jian

2020, 48(4): 60-66. doi:10.3969/j.issn.1009-086x.2020.04.09

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Studying the development idea of foreign advanced air defense missile and analyzing the key technology of missile design is an important way to develop China’s air defense equipment.The development of foreign advanced air defense missiles are reviewd,and the key technologies are analyzed,which is the important approach of devloping China’s air defense equipments.Finally,the consideration of China’s next generation air defense missile under new situation of attack and defense are put forward,which can provides some reference for the construction of air defense equipment system.

Cooperative Guidance Handover Method of the Semi-Active Ship-Air Missile

ZHAO Yong-tao, WANG Yi-dong, GUO Qiang

2020, 48(4): 67-72. doi:10.3969/j.issn.1009-086x.2020.04.10

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For the case of the guidance handover for interception beyond visual range of the semi-active ship-air missile by ship-ship coordination,the scenario of ship-ship collaborative guidance was set,and based on the analyses on the operative flow,two handover methods were firstly presented by combining the program trajectory solution and mobile communication switching technology,which are the direct switch and the interactive switch.And the feasibility of the designed methods was demonstrated,the key technology and implementation approach were put forward.Finally the advantages and disadvantages of the handover methods were analyzed.

SAR Image Segmentation Based on Improved Region Growing and Graph Cut Theory

ZHOU Qiang-feng

2020, 48(4): 73-77. doi:10.3969/j.issn.1009-086x.2020.04.11

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An SAR image segmentation method is proposed,which based on the generation characteristics of SAR.Firstly,according to statistical characterisation of SAR images,a new region growing criterion is defined to get the initial image segmentation.Then weighted undirection graph is constructed with the vertexes and the interregional similarity as the edge weight.Finally,the the minimum cut method using the global information is used to combining the regions and get the final segmentation result.The proposed method has the advantage of using both of the local information and global information.The experiment results showed the effectiveness of the approach.

Ranging Method Based on Total Variation Minimization

YANG Ming-yuan, XU Di, JIANG Li-zhong, DING Hong-hui, GU Ze-ling, ZHANG Heng

2020, 48(4): 78-85. doi:10.3969/j.issn.1009-086x.2020.04.12

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The estimation of the range of the center of the radar beam,that is the range between the center of the target area and the radar platform,is determined by the method of sum-difference amplitude-comparison.The range gate corresponding to the null depth is the estimated distance.In the actual situation,it is difficult to determine the position of null depth due to the influence of noise,so the range estimation accuracy is poor.In order to obtain a high-precision range,a radar ranging method based on total variation minimization is proposed,which can effectively perform distance estimation.The method of minimizing the total variation can suppress the noise level well,improve the signal-to-noise ratio,and make the processed data flat,so it is easy to determine the position of null depth of sum-difference amplitude-comparison,thereby further determining the range gate corresponding to zero depth.Simulation results show that the method can well suppress noise and effectively improve the ranging accuracy.

Motion Modulation False Target Jamming for SAR-GMTI System

XIE Li

2020, 48(4): 86-92. doi:10.3969/j.issn.1009-086x.2020.04.13

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To solve the failure of the conventional false target jamming against synthetic aperture radar ground moving targets indication (SAR-GMTI),a novel method named motion modulation false target jamming is put forward.Motion modulation is performed on the phase of the intercepted signal and then the modulation signal is forwarded out.The principle of the jamming is to make use of the motion characteristics of the modulation signal.The jamming will be broadened after SAR imaging,and the jamming cannot be eliminated after the channel cancellation of SAR-GMTI processing.The resisting performance of motion modulation jamming against multi-channel GMTI is analyzed.Simulation results show the effectiveness of the jamming.

Space Taget Detection Method Based on Second-Order Keystone Transform

CHEN Rui-rong, SUN Wu, JIA Xue-zhen, XU Qiu-feng

2020, 48(4): 93-101. doi:10.3969/j.issn.1009-086x.2020.04.14

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Aiming at the problem of small transmitting power and low target detectability of miniaturized space target detection radar,a weak target detection method suitable for miniaturized space target detection radar is proposed.Firstly,analyzing the received pluses which are dechirped.Secondly,applying the second-order Keystone transform to eliminate the range curvature,then the quadratic term of slow time is removed by estimating the acceleration of the target.Next,using the second-order Keystone transform again to compensate for the residual range walk.At the end,long time integration is performed for weak target detection,thus the signal to noise ratio is improved.In addition,a fast searching method of phase-coherent accumulation time agility is used to select different accumulation time in different detection ranges.Simulation analysis shows that the effectiveness of the proposed method is verified,and the simulation results and operation speed of two second-order Keystone transformation methods,sinc interpolation and CZT-IFFT are compared.

Spare Parts Demand Prediction Algorithm for Equipment Support

KANG Jing-yu , CHEN Zhong, LIU Yan-jie, CAI Jun, WANG Hui

2020, 48(4): 102-109. doi:10.3969/j.issn.1009-086x.2020.04.15

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Facing the problems of complex types of peacekeeping equipment,complex and harsh peacekeeping environment,and prominent contradiction in support maintenance,it is necessary to strengthen the demand prediction of spare parts for peacekeeping equipment support before the start of the mission.Firstly,the characteristics of peacekeeping mission are analyzed,and the concept of peacekeeping equipment support is put forward.Secondly,the steps of peacekeeping equipment support demand prediction are proposed,and the prediction model of peacekeeping equipment support based on particle swarm optimization (PSO)-back propagation (BP) neural network is studied.Finally,the effectiveness of the algorithm is verified by experiments based on actual data.The experimental results show that the prediction model of peacekeeping equipment support based on PSO-BP neural network can effectively predict the demand for spare parts of peacekeeping equipment support and improve the efficiency of peacekeeping equipment support.

Evaluation of Maintenance Support Capability of Aviation Aircraft Crew Based on Principal Component Analysis

LI Yong-xiang, CAO Ze-yang, YANG Zhi-wei

2020, 48(4): 110-116. doi:10.3969/j.issn.1009-086x.2020.04.16

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Aiming at the problem that the traditional evaluation method of maintenance support personnel’s ability and quality is single,a new method for maintenance support personnel’s ability and quality evaluation model is proposed.The methods and steps of quality evaluation of maintenance support capability of maintenance personnel by principal component analysis method are put forward and the evaluation result is given.The evaluation results obtained through calculation and analysis are objective and reasonable,which verifies that the method has certain credibility and practicability for the evaluation results of the multi-index evaluation system of maintenance support.It provides reference and basis for further strengthening the construction of maintenance personnel team.

Advantage Analysis of Sky Activation for Thermal Battery

LU Yang, ZHANG Qing-hong, CAI Bin, CHEN Yu-xin, JIN Hao-xin, DENG Kang

2020, 48(4): 117-121. doi:10.3969/j.issn.1009-086x.2020.04.17

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In order to make reasonable use of the electric energy of the thermal battery,the trajectory of thermal battery activated in the sky is considered.The thermal battery technical characteristics,working principle and activation methods are introduced.The research background is the thermal battery on short time,medium time and long time.The size and weight of the thermal battery under two different activation modes including ground activation and sky activation were analyzed and calculated.The results show that sky activation of the thermal battery can greatly reduce the size and weight which satisfy the goal of miniaturization and lightening of thermal battery better.

Research on Flexible and Extensible Modeling Framework for Warfare Equipment Confrontation Simulation

WANG Jun-da, QING Du-zheng

2020, 48(4): 122-131. doi:10.3969/j.issn.1009-086x.2020.04.18

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Simulation modeling framework can be used to guide modeling and integration,which plays an important role in constructing a simulation system.A flexible and extensible modeling framework is proposed and simulation models are classified by their attributes.Combining the flexible simulation methodology,a warfare equipment modeling framework based on extensible modeling components and integration framework is given.Equipment component model types are classified by usages.An interaction approach among models based on sharing common data board which apply to the modeling framework is designed and procedure details of model interaction and model development are given.The modeling framework can be applied to warfare equipment confrontation simulation.

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