Modern Defense Technology

Opportunities,Challenges and Countermeasures for Infrared Imaging of Hypersonic Seeker Flying in Condensed Atmosphere

YI Shi-he, DING Hao-lin

2020, 48(3): 1-10. doi:10.3969/j.issn.1009-086x.2020.03.001

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Hypersonic aircraft is a major direction of the world aerospace development in 21st century,which will bring significant changes to the world military,and form the new focus of air and space confrontation.Under this background,the infrared (IR) imaging guidance technology which is combined by optical,machine,and electricity,can provide a powerful means to improve the attack accuracy of various hypersonic weapons.However,the IR imaging of hypersonic seeker in dense atmosphere is faced with serious aero-optical effect,which seriously restricts the application of infrared imaging in hypersonic seeker.The application prospect of infrared imaging in precision strike of hypersonic weapon was analyzed.The major technical difficulties in the development process of this technology were discussed.Last but not least,some solutions and ideas were put forward.

Numerical Simulation of Aerodynamic Characteristics of a Double-body Missile

SHEN Sui-yuan, ZHU Qing-hua, CHEN Jian-wei, WANG Kun, ZENG Jia-nan, ZHU Zhen-hua, DING Zheng-yuan

2020, 48(3): 11-15. doi:10.3969/j.issn.1009-086x.2020.03.002

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The double-body missile is a special-structured missile that is formed by two single missile bodies connected together through a shared wing,and thus has unique aerodynamic characteristics.Using the FLUENT software,and spalart-allmaras (S-A) turbulence model,aerodynamic characteristics of single and double-body missiles under different Mach number and angle of attack are analized.The aerodynamic characteristics differences between the two configurations are studied.The calculation results show that: a double-body missile has better lift capacity than a single-body missile,but its resistance is greater,and the lift-to-drag ratio decreases.The resistance of the two types of missile decrease with the increase of attack angle,and their drag reduction amplitudes decrease along with the increase of Mach number.

Argument Analysis Method of Equipment Technical System Based on Capability Gap

JIAN Ping, XIONG Wei, LIU De-sheng

2020, 48(3): 16-23. doi:10.3969/j.issn.1009-086x.2020.03.003

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“Demand traction and technology promotion” is the main law of equipment system construction and development.Focusing on the relationship among capability requirement,equipment construction and technology development,the basic framework of technology system demonstration and are put forward and analyzed based on capability space and capability gap,and the basic method and process of argument analysis of technical system,including the existing capability analysis,target capability analysis,capability gap evaluation,capability-equipment-technology mapping,technology architecture view model construction,etc.are put forward.By analyzing the capability gap of equipment system,the corresponding equipment technical architecture is constructed,which provides a reference method flow for argument analysis of equipment technical system.

Equipment Operational Requirement Generation Method Based on War Design

ZHANG Cheng-long, TANG Ming-nan, LI Lin-lin

2020, 48(3): 24-30. doi:10.3969/j.issn.1009-086x.2020.03.004

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Operational demand generation is an important traction for the development of weaponry and a fundamental guarantee for future threats and military struggles.The development context, research results and future development trend of equipment operations at home and abroad are studied.From the perspective of war design,the research on the generation method of weapon equipment operation demand is carried out.The research scope is extended from the traditional single equipment ring to three equipment rings,and the design content and equipment of the future war are clarified.Design elements of the generation of operational requirements are clearly identified.The practice analysis shows that the method of generating equipment operation demand based on war design is of good usability,comprehensiveness and scientificalness.It can guide the demonstration of the capability demand of equipment,the choice of technical scheme and the improved design,and support the improvement of the actual combat capability of the equipment in China.

Survey of Complex System Modeling Methods

XIE Ran

2020, 48(3): 31-36. doi:10.3969/j.issn.1009-086x.2020.03.005

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The basic operation pattern of IT-based warfare is system-of-systems combat.Combat system is a typical complex system,which needs to be studied using complex system modeling method.The modeling methods of complex systems are discussed and on this basis,the characteristics of complex systems are summarized.The engineering application of complex system modeling is introduced and the technical route of applying complex system modeling method to combat system design is given.

Development and Key Technology of Intelligent Unmanned Combat System

LI Lin-lin, ZHANG Cheng-long, ZHUO Zhi-min

2020, 48(3): 37-43. doi:10.3969/j.issn.1009-086x.2020.03.006

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With the development of artificial intelligence, control and communication technology,Unmanned systems have been developing.In the military field,the unmanned combat system will profoundly affect the future development of the war.The development and main characteristics of foreign unmanned combat system are studied,and the key technology of intelligent unmanned combat systems are analyzed.The development conception of unmanned combat system in the future is put forward,and the key technical directions are summarized,which can provide reference for the development of intelligent unmanned air denfense system.

Characteristic and Targets of Land-Based Laser Air Defense Weapon

JI Jun-liang, WEN Yu-tao, LUO Ting-ting, XIAO Yu

2020, 48(3): 44-48. doi:10.3969/j.issn.1009-086x.2020.03.007

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The damage mechanism of land-based laser air defense weapon was described from software failure and hardware damage,combining the characteristics of air combat under information conditions,the construction of weapon system was set,six characteristics:instantaneity,flexibility,elusive,continuity,stability,controllability of land-based laser air defense weapon were summarized.Kill zone of weapon system was delimited based on boundary threshold,six kinds of targets of land-based laser air defense weapon were summed up,focuing on the characteristics of targets.

Survey of the Development of Intelligent Missile Weapon Systems

ZONG Kai-bin, ZHANG Cheng-long, ZHUO Zhi-min

2020, 48(3): 49-55. doi:10.3969/j.issn.1009-086x.2020.03.008

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With the development of the artificial intelligent technology,it has become the focus of many countries due to its impressive capabilities and great potential in the future.As a result,the artificial intelligent technology has been included in the national development strategy of many countries.Based on such technologies,various intelligent weapon systems have been developed,and some of them have been put into the practice.Therefore,the state of art of this area in foreign countries is summarized in this work,and the characteristics of diverse intelligent weapon systems are discussed as well.Finally,the future developing trends of the intelligent missile weapon system are concluded at the end.

Non-Uniformity Correction of Infrared Seeker Based onWeighted Anisotropic

GAO Ming, CHEN Wei, ZHOU Fan

2020, 48(3): 56-60. doi:10.3969/j.issn.1009-086x.2020.03.009

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The performance of the detection system is seriously affected by the non-uniformity characteristics of infrared seeker imaging.A non-uniformity correction algorithm based on weighted anisotropic infrared seeker is proposed for the non-uniformity correction proposition of infrared seeker.Firstly,the response model of infrared imaging system is briefly described, and the connection between the non-uniformity and the image histogram is analyzed,furthermore, the local weighted anisotropic histogram is introduced, forming a highly performance infrared seeker non-uniformity correction algorithm.The experimental results show that compared with other algorithms, the proposed method has obvious advantages both in terms of actual visual effect and objective quality evaluation, as well as the processing speed.

Application of the Adjacent Superior Ownership Degree Entropy in theEvaluation of Ground Air Defense Deployment

ZHANG Wen-bo, LI Xiao-jun, ZHANG Jing-sheng

2020, 48(3): 61-68. doi:10.3969/j.issn.1009-086x.2020.03.010

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For the problem that the credibility of ground air defence deployment schemes is not high,which is caused by the strong subjectivity in the process of making evaluation weights of different factors,the method of determining the weight using entropy weight of adjacent superior membership degree is proposed.The objective weight is obtained by entropy weight method,and the subjective weight is obtained by combining the subjective and objective weights,and the deployment plan is evaluated and optimized by two-level fuzzy comprehensive evaluation.An example shows that the adjacent optimal ownership degree entropy weight has high application value in the ground air defense deployment scheme,which,combined with fuzzy comprehensive evaluation,can effectively solve the difficulty in determining the weight and the randomness of influencing factors in the evaluation,and can make the evaluation result more credible.

Analysis of Evaporation Duct Sensitivity and RadarDetection Performance Based on PJ Model

LIU Yong, ZHANG Li-jun, ZHU Qing-lin, MA Qiang

2020, 48(3): 69-74. doi:10.3969/j.issn.1009-086x.2020.03.011

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The height of evaporation duct is an important parameter to represent the duct intensity.The sensitivity of evaporation duct detection system based on Paulus-Jeskes (PJ) model is analysed to the air-sea temperature difference (ASTD) and relative humity and wind speed and sensor errors.Based on the test results,the sensitivity factors affecting the height of the evaporation duct were analyzed.Considering the sensor errors all,the relative diagnostic error of the evaporation duct height are 14.3%、4.22%、8.05% respectively in the stable condition and unstable condition and neutral condition.The parabolic equation of electromagnetic wave propagation in the evaporation duct is solved,and the maximum detection distance in the evaporating duct environment is calculated by radar theory.

Study on Test Effect Evaluation Criteria of Active Jamming for Ship Antimissile

LI Xian-mao, LIN Xiao-hong, GAN Hou-ji, WANG Hong-yu

2020, 48(3): 75-80. doi:10.3969/j.issn.1009-086x.2020.03.012

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To evaluate the jamming effect of ship inboard and outboard radar active jamming equipment against anti-ship missile,the effectiveness and quantitative evaluation criteria of the shipboard active jamming equipment to terminal guidance radar are proposed.The general requirements for the application of the evaluation criteria is clarified, the test method and application method of the evaluation criteria are stipulated. Evaluation criteria includes quotas and evaluation of quotas.The application of the evaluation criteria includes the measurement method of the quotas,the data processing and the result evaluating.

Sea Clutter Backscatter Coefficient Model and EchoSignal Calculation Method for Radar

CHEN Peng, JIA Zhi-kao, SU Qi-ya, FAN Qing-hui

2020, 48(3): 81-85. doi:10.3969/j.issn.1009-086x.2020.03.013

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When radar operates on the sea in a looking-down mode, the strong sea clutter affects the target estimation and analysis seriously.The characteristics of sea clutter for different emplyments of radar may be very different.Therefore,only by analyzing and understanding the influence characteristics of sea clutter for radar,can we design an appropriate single processing method and predict the detection performance.Based on the field experimental date of radar,a suitable sea clutter backscatter coefficient model and a real-time sea clutter echo signal power computation method are proposed.Finally,the effectiveness and feasibility of the method are proved by comparing the theoretical sea clutter calculation results with the measured sea clutter results of radar.

Study on Treatment Methods of Early Warning Information

WANG Dong-hai, ZHOU Zhi-liang, LIU Bo-yang, TIAN Zhi-yu

2020, 48(3): 86-91. doi:10.3969/j.issn.1009-086x.2020.03.014

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For the problem that the elements of early warning information and the information extracting methods of from raw radar data captured by early warning radar are uncertain,the elements that can be included in the early warning information are put forward,and the data processing method with the characteristics of the elements is given.The proposed method was tested in the missile weapon test,which have certain guiding significance to further data accumulate and the construction of the early warning system.

Clustered Reconnaissance and Defense System

SUN Tao, WANG Jun-da, WANG Mu-shen, MENG Chun-kao, ZHU Yue

2020, 48(3): 92-98. doi:10.3969/j.issn.1009-086x.2020.03.015

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A clustered reconnaissance and defense system is designed,which can be used in military reconnaissance and civil disaster relief detection.The cubic unit is the core of the system hardware.The subsystems including fixed-wing UAV(unmanned aerial vehicle),four-rotor UAV and UAV are integrated in the cubic unit system.The working background is set,and the function and the working flow of the system are designed.A four-level communication network is designed to realize the information exchanges between UAV subsystems,collaborative communications between cubic unit systems,and information exchanges with remote command center.To realize the detection and defense tasks,a three-level command and control network is designed to implement intelligent collaborative management of tasks,data processing,and task execution control.The system can realize the function of detection and the function of regional communication relay,which can play an important role in both civil disaster relief and military war area detection and defense.

Effectiveness Analysis of Search and Warning Radar Reconnaissance by Electronic Countermeasure Reconnaissance Satellite

FU Ben-long, ZONG Si-guang

2020, 48(3): 99-103. doi:10.3969/j.issn.1009-086x.2020.03.016

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The electronic countermeasure reconnaissance satellite has its unique advantages in the electronic signal reconnaissance of the search and warning radar.Previous studies have focused more on the revisit period and coverage of satellite,lack of quantitative analysis of satellite signal reconnaissance capability.By analizing the power density distribution of ship radar signal in space,the reconnaissance model of ECM reconnaissance satellite for search and warning radar on sea is constructed.The data of three typical radars are brought into the model and simulated,and durations of reconnaissance are analyzed.Finally,some suggestions for further are put forward.

Application of Improved PSO Algorithm in Radar-Net Deployment

MA Yan-yan, JIN Hong-bin, LI Hao, ZHANG Hui

2020, 48(3): 104-112. doi:10.3969/j.issn.1009-086x.2020.03.017

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A mathematical model of radar net deployment is established by analyzing the detection performance indicators of radar network.At the same time,an optimal deployment scheme of radar networking based on adaptive opposition-based particle swarm optimization (AOPSO) algorithm is proposed.On this basis,the influence of each performance index on the detection ability in different cases is analyzed by adjusting the weighted value,and the optimal deployment in each case is obtained.The simulation results show that the results obtained by the improved algorithm are better than those obtained by standard particle swarm optimization algorithm,which verifies the feasibility of the mathematical model and the effectiveness of the improved algorithm.

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