Modern Defense Technology

An Online Feedback Filtering Algorithm for Hypersonic Vehicle

GAO Chang-sheng, WANG Yue-xin, JING Wu-xing, HU Yu-dong

2021, 49(1): 1-7. doi:10.3969/j.issn.1009-086x.2021.01.001

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Hypersonic vehicle is a new concept vehicle developed by many countries in recent years.Aiming at the problem that it is difficult to track its flight trajectory with high precision,combined with the strong adaptive and self-learning ability of neural network,an online feedback filtering algorithm for hypersonic vehicle is proposed.Based on the current statistical model,BP neural network and Kalman filter are used to design the filter to realize the high-precision tracking of hypersonic vehicle.Finally,the simulation results show that the online feedback filtering algorithm is effective in tracking hypersonic vehicle.

Big Data Management Design Method of Weapon System Based on Hierarchical System

GAO Jian, YANG Fu-xue, WANG Bao-long

2021, 49(1): 8-17. doi:10.3969/j.issn.1009-086x.2021.01.002

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Weapon system requires large amounts of data during the process of test,training and combat.At the same time,a large amount of data will be generated.The tight hinges of these data support the operation of the weapon system,which is the important foundation for modern networked combat.The data characteristics of weapon system are studied.And the data management method based on three-tier system is proposed.The data are stratified into three levels according to the characteristics of the data structure,retrieval frequency,and update frequency.These data are managed by different storage technology and platform.The data transformation relationship among the three layers is also described.Finally,some application results are listed.

Requirement Generation Mechanism in Defense Acquisition Process

ZONG Kai-bin, ZHANG Cheng-long, XUE Chen-xi

2021, 49(1): 18-26. doi:10.3969/j.issn.1009-086x.2021.01.003

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With the mature of the national defense field,the importance of requirement generation is rapidly increasing.By demonstrating the top-level requirements,the effective traction for future development is achieved.As national defense acquisition is a typical complex system,which involves many processes and participates,it is necessary to propose an effective method based on system engineering theory,in order to guide the acquisition process and lead to a successful result.For implementing the requirement generation,the Joint Capability Integration and Development System (JCIDS) has been constructed.By defining a set of unambiguous and executable steps,the framework of requirement generation has been clarified,which transfers the defense acquisition from “threat-based” model to the “capability-based” model.Therefore,elaborating the requirement generation mechanism in defense acquisition is focused,especially for its compositions and operation process,in order to comprehend essentials of the defense acquisition and provide a reference for the related work.

Understanding and Thinking about Security Issues of Deep Sea

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

2021, 49(1): 27-31. doi:10.3969/j.issn.1009-086x.2021.01.004

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Carrying out holistic concept of National security need to concern security not only from traditional field,but also from jumped up field.As a jumped-up and strategic field,researching security of Deep sea have great significance.From the viewpoint of security research,several problems which are valuable to be regarded during the course of Deep sea exploitation are considered.It is hoped to support the research of security,and attract more people to concern Deep sea security and promoted the development of Deep sea exploitation and security more harmoniously.

Research on C⁴ISR System Architecture for Human Computer Fusion

ZHANG Zhao-chen, MAO Xiao-bin, ZHOU Guang-xia

2021, 49(1): 32-39. doi:10.3969/j.issn.1009-086x.2021.01.005

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In the intelligent war,building a “computer brain” that can understand, think and cooperate with human is one of the development directions of the future C⁴ISR system.The design concept of C⁴ISR system architecture for human-computer fusion is proposed,which is the transfer of human intelligence to computer intelligence.The core elements of the system composition such as the game confrontation deduction environment is designed innovatively.The operational mechanisms before and during the war are elaborated.The C⁴ISR system architecture paradigm of human-computer fusion is formed.Finally,taking intelligent target recognition and weapon control as an example, using the Department of Defense Architecture Framework (DoDAF) and the architecture design tool,the application process of the architecture paradigm in the next generation system design is described.

Researh on Electrostatic Discharge Effect of Missile and Application of Protective Device for It

ZHANG Li, ZHANG Jia-jun, LI Xin-yu, SI Xiao-liang

2021, 49(1): 40-46. doi:10.3969/j.issn.1009-086x.2021.01.006

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Electrostatic protection is the rigid requirement of missile development.Described the main ways of electrostatic charge deposition in missile;introduced three typical forms of missile electrostatic discharge;analyzed the different effects of electrostatic discharge current effect and electrostatic discharge electromagnetic pulse effect on the sensor radiation signal and system signal-to-noise ratio of missile;studied the effects of electrostatic dischargers on the safety and functional performance of missile;introduced the typical application of electrostatic dischargers,proved the necessity of installing electrostaic protective device in missile.

Formation Control with Linear Quadratic Regulator and Model Predictive Control

WU Mei-liwen, WANG Xiao-dong, SONG Xun, CHEN Yan-fei

2021, 49(1): 47-52. doi:10.3969/j.issn.1009-086x.2021.01.007

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Multi-agent group combat is an important form in the future battlefield.As a key technology in group operations,formation control has a wide range of application.Focusing on the formation control law,two optimal control methods are applied:linear quadratic regulator (LQR) and model predictive control (MPC).The methods are analyzed in a circular formation scene.Based on the similarity consistency algorithm,utilizes second-order dynamic model to explore the optimal control effect of four agents rotating around the trajectory center in the two-dimension plane.The results show that the model predictive control has larger speed of convergence,higher control stability and smaller side errors than the linear quadratic regulator method.The lateral error of the formation agent following a circular trajectory is greatly reduced by MPC with lateral acceleration compensation.

Study on Guidance System Compensation Method Based on Classical Control

CAO You-liang

2021, 49(1): 53-58. doi:10.3969/j.issn.1009-086x.2021.01.008

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When air-to-air missile strikes a large maneuvering target,the increasing speed of guidance system is needed.Based on the classical control theory,the transient and frequency response can be improved by using the feedback/feed-forward control signal,the performance of the guidance loop can be further improved by introducing the actual acceleration compensation.With these methods,the guidance system compensation algorithm is designed.The performance of the guidance system compensation algorithm is simulated by linearization model,the simulation results show that the guidance system compensation algorithm can reduce the miss distance caused by target maneuvering.Finally,the angle measuring noise of the seeker is added.The performance of the guidance control system before and after the correction algorithmis simulated and compared,and the correction algorithm under the noise enviroment is optimized based on the analysis result.

Design of a Guidance Law which can Achieve Overhead-Attacking with Desired Angle

WU Kun, CHEN Dong-sheng, JIN Yue

2021, 49(1): 59-65. doi:10.3969/j.issn.1009-086x.2021.01.009

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In the design of existing guidance law for small missiles,the range of angle constrainsts is often limited.In order to expand the feasible range of angle constraints and achieve a full range of striking on the target,a guidance law which can achieve overhead attacking based on the principle of double arcs was designed.Firstly,the missile target relative motion model of terminal guidance phase was constructed,and the principle of double arcs curve fitting was proved and the key parameters were deduced.Finally,the guidance law was designed based on the principle,which can strike the target from any angle.The simulation results showed that the range of the feasible angle is greatly expanded,the guidance law even can lead to overhead attacking.Besides,the guidance scheme has a strong ability to control the impact angle,the overload near the hit point of the guidance law is much smaller than the biased PNG,the energy consumed is much less than BPNG,and the guidance scheme can satisfy the miss distance requirements.The significance of engineering is obvious.

Single Axis Rotation IMU/DTU Integrated Navigation Algorithm for Marching Vehicles

CHEN Hong-yue, CHEN Yu, ZHAO Xiao-wei, CAO Quan, SUN Shou-cai

2021, 49(1): 66-74. doi:10.3969/j.issn.1009-086x.2021.01.010

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Heading error of Strapdown inertial navigation system (INS) may be enlarged in some complicated road and vehicle conditions when maneuvering long time.An integrated navigation algorithm based on single INS (SINS) integrated navigation algorithm frame was presented.Integrated navigation was achieved through Kalman filter with 21 error states of the inertial measurement unit/distance transfer unit (IMU/DTU),which selected the difference between the displacement increment obtained respectively from the INS and the DTUas the observation term.Most errors of IMU/DTU integrated navigation system was canceled automatically by way of rotation and Kalman filter,which integrated information from the INS and the DTU.Precise position information and attitude information could be output without special conditions for marching vehicles.Some simulation experiments and vehicular tests were executed,which showed that the algorithm was able to achieve precise heading(attitude) and position.Potential accuracy was discovered.Rapid response capability,environmental adaptability and usability were improved greatly.

Sensor Management Architecture of Naval Formations

DING Chun-shan, HE Jia-zhou

2021, 49(1): 75-83. doi:10.3969/j.issn.1009-086x.2021.01.011

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In the information based maritime battlefield,obtaining information superiority is one of the bases to guarantee the battle victory,and the sensor management is the key link to improve the overall sensor detection efficiency and achieve the information superiority.Firstly,analyzes the management requirements of maritime formation sensors,including the structure,function and management requirements of formation,platform and single sensor.Secondly,the overall architecture of sensor management for maritime formation which adopt a hybrid structure is studied,and the processing flow,input and output,processing principles of planning and real time scheduling,as well as an event driven sensor operational management technical framework are designed,so as to estabilish the top architecture of sensor management for naval formation.

Measurement Method and Error Analysis of Light Screen Target

LU Xiao-fei, YI Cheng-long, ZOU Wei-ke, TU Guo-yong, YANG Hong-bing

2021, 49(1): 84-90. doi:10.3969/j.issn.1009-086x.2021.01.012

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Aiming at the actual requirements of fragment speed measurement,a method for the processing of light screen target measurement data as well as a speed error propagation model are developed.The matching technology of both the target signal waveform and the fragment orbit is studied.Based on the unbiased estimation,the scopes of random error for parameters such as time and distance are determined.And the total error of fragment speed measurement are given with considering the time and distance matching errors.

Research and Testing Verification on Anti Loosening of Locking Thread Technique

HUANG Zhi-qiang, ZHENG Wang-hui, JIN Jing-feng

2021, 49(1): 91-97. doi:10.3969/j.issn.1009-086x.2021.01.013

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Thread joint has serveral advantages such as simple structure, convenient dismounting,various format,reliable joint,good interchangeability,therefore it is widely applied in machinery and engineering equipments.The cause and the anti loosening method of thread joint is researched,And several new anti-Loosening methods of thread are introduced.At the same time,some transverse vibration testing are implemented on a group of thread joints according to the national standard.The result of the test proves the anti loosening effect of several thread joint, and provides some reference for thread selecting in structure design field.

Research on Simulation Training System for Peacekeeping Equipment Support

KANG Jing-yu, LIU Jing, CHEN Zhong, ZHENG Zhen-guo, WANG Hui

2021, 49(1): 98-106. doi:10.3969/j.issn.1009-086x.2021.01.014

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Due to the complex environment of international peacekeeping missions,numerous equipment support has become a key point affecting the achievement of the mission.Strengthening the capacity training system of the support people is a guarantee for effectively carrying out overseas equipment support tasks.Using a variety of simulation,virtual reality and other technologies,with the help of Internet,satellite and other information transmission platforms,a comprehensive simulation training system can be built,which can effectively solve the difficulties on comprehensiveness,sustainability,accessibility and economy.After analyzing the requirements of people training to implement a peacekeeping mission,the overall design of the integrated simulation training system is developed,including system overall architecture,composition,technical architecture, information interaction,etc.The key technologies are refined and analyzed.A comprehensive and effective solution for improving the effectiveness of international peacekeeping equipment support training and buildingis provided.

Mission Planning of Operationally Responsive Space for Solid Launch Vehicle

CAI Ying-zhou, HE Shao-fei, GU Zhen-feng, YAN Guo-wei

2021, 49(1): 107-115. doi:10.3969/j.issn.1009-086x.2021.01.015

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To solve the problem of quick mission elements planning faced during operationally responsive space (ORS) because of the independence of trajectory of solid launch vehicle and microsatellite orbit design,a mission planning method of ORS for solid launch vehicle is proposed.Firstly,the definition of ORS mission planning is summarized.On the basis,the general framework of ORS mission planning based on solid launch vehicle is designed and divided into 6 modules,including factor analysis,orbit design,trajectory design,path planning,project evaluation and simulation.Then the functions are introduced and the information interaction and restrictive correlation between modules are teased out.Finally,the realization methods and working processes of modules are studied.The results of the study can provide reference for the development of ORS mission planning for solid launch vehicle.

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