Modern Defense Technology

Research on the Evaluation Method of Anti-Precision Guided Weapons Operation Effect with Directed Energy

HU Xiao-lei, ZHAO Yu

2021, 49(2): 1-7. doi:10.3969/j.issn.1009-086x.2021.02.001

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The guidance accuracy of precision guided weapons will decrease when the guidance,navigation and control systems are damaged or disturbed by the directed energy weapon.However,the precision guided weapons may still pose a threat to the target.The guidance precision variation of precision guided weapons before and after seeker failure is analyzed by trajectory simulation.Then,the deviation criterion for precision guided weapons is proposed combined with risk-estimate distances of the US army.The criterion can quantitatively evaluate the combat effectiveness of anti-precision guidance weapons operation with directed energy.

Some Thoughts on Deep Space Safety in Future

WU Li-jun, WANG Xu, WANG Jian-bin

2021, 49(2): 8-12. doi:10.3969/j.issn.1009-086x.2021.02.002

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The strategic worth of deep space is commonly concerned and regarded by international society,every aerospace great power is quickening the development of deep space activity.As a new and important strategic field,the security problem of deep space can not be evited.Problems confronted by the security of deep space are thinked from international politics、developing stratagem、science and technology、militarization、environment abnormity and asteroid,hope to promote the research in security of deep space.

Research on Operational Effectiveness Evaluation of Antiship Missile Based on OODA Cycle

BU Xiao-dong, ZHANG Jun

2021, 49(2): 13-19. doi:10.3969/j.issn.1009-086x.2021.02.003

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In view of the current operational effectiveness evaluation of missile weapon systems,there are problems such as large hierarchical span,complex basic data,and many structural uncertain factors.Based on the mission and method framework,constructs an antiship missile combat index system,and combines the observe,orient,decide,act (OODA) combat loop idea to construct a system combat network model.Using the improved information entropy method,a scientific and accurate combat effectiveness evaluation method is proposed.The missile combat effectiveness is evaluated through specific examples,and the system contribution rate of the new antiship missile is calculated to be 16.2%,which verifies the feasibility of this method.

Application of Intelligent Mines in Special Operations

LI Huan, LIU Xin-lu

2021, 49(2): 20-25. doi:10.3969/j.issn.1009-086x.2021.02.004

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Intelligent mine is a new combat weapon system integrating sensing technology,artificial intelligence technology and Internet of Things technology.It is an intelligent weapon and equipment with autonomous identification,positioning,tracking,active searching and self-destruction.Firstly introduces the types of mines,the principles and characteristics of several smart mines.Secondly analyzes the key technologies of smart mines and the application of smart mines in special operations,which provides a strong guarantee for future special operations.

Research on Applications and Key Technologies of Multi-Weapons in Cross-Domain Intelligent Coordination Air Combat

TANG Run-ze, ZHANG Cheng-long, LI Lin-lin, WANG Shi-kai

2021, 49(2): 26-34. doi:10.3969/j.issn.1009-086x.2021.02.005

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With the gradual integration of artificial intelligence technology and air combat weapons,new features such as intelligence,cross-domain,autonomy,distribution,and coordination are becoming increasingly prominent and constantly promoting the evolution of future air combat to new forms.Firstly analyzes the foreign development status of air combat,analyzes and judges the future development of air combat technology,proposes the multi-weapon cross-domain intelligent coordinated air-to-air combat operational scenario.Then expounds the application and key technologies.Finally,summarizes and forecasts the development of intelligent air combat,and promotes the application of artificial intelligence technology in air combat weapon systems.

Impact Analysis of Structure Characteristics of Cluster Bombs on Separation Characteristics

HUANG Yang-yang, JIANG Yi, LI Yu-long, ZHANG Man-man, YANG Chang-zhi

2021, 49(2): 35-42. doi:10.3969/j.issn.1009-086x.2021.02.006

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The separation process of submunitions under supersonic velocity is a typical multi-body separation problem including multi-body motion boundary and complex aerodynamic flow field interference.Based on the nested grid technique,the equations of convection physics and the equations of 6 degrees of freedom of rigid body dynamics are coupled,influence of the structure characteristics (such as number,missile wings,arrangement,etc.) of the submunition on the flow field characteristics in the separation process is emphatically studied.Results show that the method of overset grids can well simulate the complex aerodynamics flow condition of multiple missiles.Under certain circumstances,more bullets will bring stronger aerodynamic coupling effect in;Missile wings can greatly improve the static stability of bullets;Compared with “circular” distribution,“central circular” distribution tends to accelerate the separation of projectile bodies.

Mechanism Analysis of Inlet with Different Suction Slots Layout by Numerical Simulation

LIU Bo

2021, 49(2): 43-48. doi:10.3969/j.issn.1009-086x.2021.02.007

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Mechanism analysis of supersonic inlet with two suction slot layout using standard k-ω SST turbulence model with numerical calculation method.The results show that:Mach number increased due to interaction with reflected shock wave and expansion wave caused by the leading edge of the suction slot;A circulate eddy is formed in the suction slot and multiple reflected in model-1.The Mach number increases to 3.6.and then decreased in the;A subsonic region is formed in the suction slot of model-2 due to shear layer,and a strong compression wave is formed at the rear edge of the suction slot,which intersect with the reflected shock wave many times.Upper wall pressure of model-2 is larger than model-1 with the overall trend.

Study on Cooperative Mission Planning Algorithm for Multi-Base and Multi-Target UAV

PAN Nan, LIU Hai-shi, CHEN Qi-yong, YAN Li-xian, GUO Xiao-jue

2021, 49(2): 49-56. doi:10.3969/j.issn.1009-086x.2021.02.008

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In the multi-objective optimization and decision-making problem of multi-objective and multi-unmanned aerial vehicle (UAV),which has many constraints,complex and coupling,the traditional particle swarm optimization (PSO) algorithm is easy to fall into the local optimal in the optimization.Therefore,a hybrid particle swarm optimization algorithm based on simulated annealing (SA-PSO) is proposed.Based on the background of the attack task,comprehensively considers the physical performance constraints of the UAV,builds the minimum fitness function of the track length and the minimum fitness function of the threat cost to construct the objective function.First,use the Voronoi diagram and the Dijkstra algorithm for path planning,then a hybrid particle swarm optimization algorithm based on simulated annealing is used for task assignment.The simulation results show that the proposed algorithm combines the advantages of simulated annealing algorithm (SA) and particle PSO,which can quickly solve the approximate optimal solution of UAV task planning and is compatible with PSO algorithm.Compared with the SA algorithm,better results is obtained when there are enough evolution times.

Air Joint Networking Parameters Configuration Optimization Algorithm of Flexible Nets

JIA Yan-xiang, QIU Xu-yang, BIAN Wei-wei, LIU Liang

2021, 49(2): 57-63. doi:10.3969/j.issn.1009-086x.2021.02.009

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Aiming at the short-time,high dynamic and nonlinear characteristics of the flexible networking in the process of intercepting unmanned aerial vehicle (UAV) target by joint nets,the mechanical model of flexible net and the dynamic model of air joint networking are established.Combined with the constraints that need to be considered in the process of intercepting target,the evaluation indexes for the performance of the networking acquisition method are proposed.The multi-objective optimization algorithm based on decomposition is used to optimize the launch parameters of the joint combination of multi flexible nets.The optimal configuration parameters of two flexible nets joint launch,three flexible nets joint launch and four flexible nets joint launch are obtained through simulation test.The results show that the algorithm is reasonable and effective.It can provide a theoretical reference for the design of key parameters of flexible nets in air joint networking.

Analysis of Double Overlapping Signals and Improvement of IFM System

WANG Hong-xun, WANG Lian-he, WANG Jian, WANG Shi-yan, WANG Hong-lei

2021, 49(2): 64-71. doi:10.3969/j.issn.1009-086x.2021.02.010

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RWR (radar-warning receiver)/ESM (electronic warfare support measure) system usually uses traditional instantaneous frequency measure (IFM) technology to detect the frequency of signals in real time,but it can only estimate one frequency when it receives overlapping signals,and easily create frequency measurement errors.But in complex electromagnetic environment of the modern battle,pulses overlapping probability increase.So analyzing the influence of overlapping signals to IFM system is particularly important.Through the basic principle of IFM,analyzed each node response of IFM microwave phase discriminator in the case of double overlapping signals,built mathematical model of output U_I,U_Q and put forward a new algorithm—U_I,U_Q calculation algorithm that can estimate the frequency of double overlapping signals.Simulation results show that the algorithm can estimate the frequency of overlapping signals and keep advantages of original IFM.

Progressive Optimization Algorithm for Beam Optimization of Phased Array Antenna Array

MA Xiao-meng, HE Min, ZHNAG Chang-ge

2021, 49(2): 72-77. doi:10.3969/j.issn.1009-086x.2021.02.011

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Aiming at the influence of errors and interference in the phased array seeker on the array beam,proposes a progressive algorithm combining weight approximation and genetic algorithm to achieve the maximum optimization of the beam.The algorithm comprehensively considers the interference of the mutual coupling effect of the array on the beam and the quantization error.Based on the approximate weights,the sidelobe level,zero depth and beam width of the array beam are used as optimization indicators,and genetic algorithms are introduced to continuously approach the realization of the beam Optimization.The progressive algorithm is optimized on the basis of approximate weights,which further improves the performance of the beam and has strong flexibility.

Study on the Key Problem of Long-Range MMW High Resolution Radar System

WANG Yang, ZHANG Yu, LIU Dan, JIN Sheng

2021, 49(2): 78-85. doi:10.3969/j.issn.1009-086x.2021.02.012

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The characteristics of millimeter wave radar,including working frequency band,target detection and imaging ability,weather transmission characteristics,are numerically simulated and analyzed.Based on the analysis of the indicators and technical characteristics of typical millimeter wave (MMW) radars in western countries,the development trend of MMW radars is given.In view of China’s space target detection requirements,overall problem of long-range MMW radar technologies are studied.The key technologies that restrict the design of radar system are analyzed,and the technical solutions are proposed.

Reliability and Maintenance Cost Evaluation of Long-Period Service System

ZHU Hua-yuan, LI Jun-liang, WANG Li-ming, WANG Zheng, LIU Jian-chao

2021, 49(2): 86-94. doi:10.3969/j.issn.1009-086x.2021.02.013

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Military aircraft and other weapon equipment systems are becoming more and more complex,and the failure rules of complex equipment systems are also becoming more and more complicated.Maintenance is an important means to maintain the quality characteristics of equipment.Reasonable measurement of the effective of maintenance behavior on reliability and maintenance costs are important for equipment support,reliability predicting and support effectiveness.A reliability model for complex equipment is fitted by Gamma distribution based on service data,and through the actual maintenance process of the equipment,a service life regression model based on the normal distribution is designed to measure the random maintenance effect of the equipment.Then cost model of equipment maintenance for preventive maintenance and opportunistic maintenance are constructed.Taking an aircraft carrier information detection as an example,the built life distribution model,imperfect maintenance model and maintenance cost model are verified respectively.The results show that the presented method can reflect the reliability and maintainability of the equipment in the real service environment more realistically.Research methods and results can provide decision-making methods and basis for the design,service and support evaluation of complex equipment.

The Camouflage Countermeasures of Self-Propelled Artillery Under Visible Light Reconnaissance

WEI Jia-nan, ZHANG Zhen-you, WANG Shu-xin

2021, 49(2): 95-100. doi:10.3969/j.issn.1009-086x.2021.02.014

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To solve the problem of camouflage under visible light reconnaissance,discusses its detection probability and countermeasures,by calculating the detection probability of self-propelled artillery,according to the formula and function of image,puts forward some countermeasures,studies the measures of camouflage from different angles.It can provide reference for improving self-propelled artillery camouflage ability.

Research on Missile Remote Test System Design Based on Network Technology

ZHU Jing-lai, FENG Meng-qi, GU Bin-bin, MA Xiao-dong

2021, 49(2): 101-105. doi:10.3969/j.issn.1009-086x.2021.02.015

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Missile test is used to evaluate the electrical performance of missile by applying excitation and acquisition of feedback signals.To meet the needs of high efficiency and deep analysis of data in missile research and development,a remote missile test system based on network technology is proposed,which integrate data from missile system in test site and in research and development center.It realizes a new pattern of missile test,which allows the test equipment in front and the interpretation of data in the rear.The practical application of the system shows that the efficiency is improved and the use of data is effectively,which meets the missile test need.

Design of Ku-Band Power Division Amplification 3D-MCM

ZHAO Yu-meng, FAN Shou-tao, HAN Yu, WANG Chuan

2021, 49(2): 106-110. doi:10.3969/j.issn.1009-086x.2021.02.016

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The multi-chip module (MCM) plays an important role in microwave products. Its level of integration directly affect the miniaturization and lightweight of products.So far the vast majority of MCM in the military field still adopt the traditional two-dimensional multi-chip module (2D-MCM) form.For higher integration density,MCM should be transformed into the three-dimensional multi-chip module (3D-MCM) form.The microwave vertical interconnection process,which is the basis for 3D-MCM,is a key technology to realize the miniaturization and light weight of microwave products.But it has greater design complexity in the transmission and matching of microwave signals in the Ku band.On the basis of 3D-MCM simulation,a Ku band power division amplification is designed.Under the same performance index,the volume can be reduced by more than 40% compared with the products adopting traditional 2D-MCM.

Design and Implementation of Intelligence Information Simulation Software for Sea-Aero Targets

GONG Bo-wen

2021, 49(2): 111-117. doi:10.3969/j.issn.1009-086x.2021.02.017

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Aiming at the problem that it is difficult to carry out functional tests such as fusion data processing and situation fusion display due to the lack of sea-aero target intelligence data before the intelligence processing system is put into use,the demand for simulation environment of the intelligence processing system during the test command process is analyzed,and the overall design idea of the architecture and function model of the sea-aero target intelligence software system is proposed.It adopts the technical method of moving track simulation based on target characteristics and using noise processing to compensate the error of the generated information,which realizes the target track simulation and makes the simulation information more fit the detection equipment to the target observation in the real environment.The practical application verifies the feasibility of the technical method and the flexible applicability of software simulation.

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