Modern Defense Technology

Overall Design of a Joint Wing Stratospheric Airship

HAN Qing, QIAO Liang, QIN Qi

2020, 48(1): 1-10. doi:10.3969/j.issn.1009-086x.2020.01.001

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Comparing and analyzing the existing stratospheric airships, a joint-type stratospheric airship with a conventional streamlined lift boat and intermediate wing is proposed. The concept, key components and digital model are designed. Through aerodynamic feasibility and parameter sensitivity analyzing, the feasibility of the preliminary scheme is proposed. The airship can maintain long-term life in the vicinity of the space, enabling remote reconnaissance, intelligence detection, land survey, disaster acquisition, and communication. The low cost and other advantages have reference value for future spacecraft design.

New Type of UAV Defense and Control System for Key Areas

ZHANG Jin, XUE De-xin, WANG Feng-jia

2020, 48(1): 11-18. doi:10.3969/j.issn.1009-086x.2020.01.002

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With the great amelioration of unmanned aerial vehicle (UAV) technology and the gradual opening of low-altitude airspace authorized by national policies, low-altitude and low-speed UAV increasingly intimidates the security of key areas. On the basis of the advantages and disadvantages of domestic and overseas defense and control systems (fixed and mobile types), a new type of UAV defense and control system, integrating the two subsystems through wireless network technology, is proposed to fully compensate for their respective weaknesses, and achieve several key technologies such as multi-objective cooperative attack, remote assisting attack, etc. Then, a pilot application of the new UAV defense and control system was carried out at Shapotou Airport, Zhongwei, Ningxia. In the process, strong capabilities of the multi-target cooperative attack and remote assisting attack performed by the new UAV defense and control system were fully substantiated. The construction of this new UAV defense and control system is an important exploration of anti-UAV systems, which inspires the further development of new anti-UAV strategies.

An Aerial Target Track Clustering Method

LIANG Fu-tai, LI Hong-quan, MENG Qing-wen, CAI Li

2020, 48(1): 19-25. doi:10.3969/j.issn.1009-086x.2020.01.003

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Aiming at the shortcomings of the traditional track clustering methods, an aerial target track clustering method is proposed. Firstly, an adaptive track fitting algorithm is proposed to extract the track features of the air target. Then, based on the extracted track features, a track clustering method based on k-means algorithm is proposed. By clustering the track feature points and fitting curve coefficients, the same kind of tracks are clustered to form similar track clusters. Finally, the effectiveness of the clustering method is verified by simulations.

Some Problems in the Design of Fuze Warhead System for Eccentric Priming Directional Warhead

FU Si-qin, JI Cong-sheng, JI Jun-peng

2020, 48(1): 26-31. doi:10.3969/j.issn.1009-086x.2020.01.004

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Based on the features of eccentric priming directional warhead for engineering applications, the key considerations of designing the fuze warhead system are proposed. The applicable technical solutions and solvations for fuze warhead system are discussed from four directions: target orientation recognition, division of the warhead orientation, selection of safety actuator mechanism, and the synchronization of multipoint initiations. This research can provide the reference for overall design of the fuze warhead system.

Spacecraft Attitude Control Using Pulse-Width Pulse-Frequency Modulator

TIAN Yuan, WANG Jun-bo, XIU Jing-ya

2020, 48(1): 32-37. doi:10.3969/j.issn.1009-086x.2020.01.005

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A modular design method is proposed for the spacecraft which employs constant thrust on-off jets as actuators. The attitude controller is divided into two sub-controllers based on their functions: a continuous controller for the spacecraft and a pulse-width pulse-frequency (PWPF) modulator for the on-off actuators. The on-off command for the jets is generated by the PWPF modulator which employs the command from the continuous controller as its input. There are eight parameters existing in the attitude controller to be designed. The phase plane method is utilized to analyze the attitude control system and a parameter tuning method is proposed based on the characteristics of the phase locus. This method has the advantage of simplifying the complex non-continuous control system design through combining the continuous controller and the PWPF modulator. Simulation results show that the attitude controller possesses the advantages, such as effectiveness, reliability and good perspective of engineering application.

Chaos Modeling and Analysising of Command Decision Making for Ship′s Gun Fire Commander

YANG Shao-qing, TAO Zhong-tao, HUANG Yi

2020, 48(1): 38-43. doi:10.3969/j.issn.1009-086x.2020.01.006

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Many models of decision making is a loop to people. Making decisions is a loop to the commander who is in charge of naval gun shooting in general. Making decisions is also psychological. A chaotic model based on Lefebvre model is built, the chaotic phenomenon in making decisions is analyzed, also some advices on the training of the commander are proposed. There is a certain reference value to the training of the commanders and the study of the simulation of people in loop system.

Emitter Individual Identification Method Based on the New Intelligent Feature Set

WANG Shang-yue, WANG Yue, GAO Lu, LIU Xin, QIN Peng, CAO Yang

2020, 48(1): 44-51. doi:10.3969/j.issn.1009-086x.2020.01.007

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The difference in the structure of radar transmitters and the use of electronic devices determine the uniqueness of the radiation source. The emitter individual identification method based on new intelligent feature set is proposed. Firstly, the received signals are transformed in time-domain, frequency-domain, time-frequency domain, polarization domain, and the features are extracted, secondly, the new intelligent feature set of each radiation source is constructed. In order to improve the computing speed and remove redundant information, master feature of the new intelligent feature set are extracted using principal component analysis, and then by choosing the optimal RBF kernel function with support vector machine (SVM), the individual identification is realized. By simulating and verifying the signals of three radiation sources, the radiation source can be characterized uniquely with the new intelligent feature set. Under low SNR, the radiation source individual can be identified quickly and effectively, by simulating the CW,BPSK,LFM signal respectively, more than 85% recognition rate can be reached in more than 3 db SNR, which verifies the validity and feasibility of the method.

Analysis of the Aircraft Selection of Radar Precision Flight Test

ZHENG Quan-pu, ZHENG Guang-yong, ZHAO Wen-jie, HUO Shuo-shuo, XIE Ting-ting

2020, 48(1): 52-56. doi:10.3969/j.issn.1009-086x.2020.01.008

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In the radar precision flight test, the size, shape and radar cross section (RCS) etc. of the test aircraft will have an impact on the test data. The impact of different test aircraft on radar accuracy flight test data is analyzed from three aspects: azimuth error, distance error and height error. By analyzing and calculating the error of the two kinds of aircrafts on the test data, it is proposed to use different aircraft for radar test. The principle method of precision test can be used to guide the selection of aircraft for radar accuracy test.

Passive Location and Error Analysis Based on Change Rate of Phase Difference

JIANG Zhi-qiang, SHAN Shi-hao, ZHANG Heng, HUANG Feng

2020, 48(1): 57-61. doi:10.3969/j.issn.1009-086x.2020.01.009

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The model of direction finding error and ranging error were established based on the principle and method of two-dimensional passive location. The analysis of error model show that, phase difference change rate error was the main influence factor of location error. In addition, not only the influence of relative position of target and observation station on azimuth error, but also the influence of direction finding error and phase difference rate error on distance measurement were analyzed. Finally, the relative ranging error of the ranging data was realized by using extended Kalman filter (EKF), which effectively improves the passive positioning accuracy of the moving observation station to the fixed target.

Jamming Method of Radar RF Cover

SHEN Yi-long, WANG Kun, JIN Hao, HUAI Yang

2020, 48(1): 62-67. doi:10.3969/j.issn.1009-086x.2020.01.010

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First of all,the deficiencies of noise interference and coherent interference based on drop edge trigger in radar radio frequency(RF) cover are analyzed, the research is focused on the interference response time and frequency agility signal adaptability. It is pointed out that the response time of coherent interference based on drop edge trigger is long, which is easy to be recognized by the operator and impossible to adapt to frequency agility signal. Therefore, the jamming method based on pulse cluster identification is proposed. The advantage of this method in anti-radar RF cover is analyzed, and its effectiveness is verified.

Summary of the Response of Solid Rocket Motor Under Storage and Transportation Condition

LI Tian-peng, LIU Yue-long, AN Zhen-tao

2020, 48(1): 68-73. doi:10.3969/j.issn.1009-086x.2020.01.011

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During the process of storage and transportation, the solid rocket motor (SRM) mainly bearing temperature and random vibration loads. The safety of the rocket grain is possibly affected by the stress-strain concentration in the instantaneous action and the performance degradation of the propellant in the long-term dynamic loads. The characteristics and rules of the response of SRM under different temperature loads, such as solidification and cooling, low temperature and the cycling temperature loads are analyzed. Also that under different vibration loads, such as ship borne vibration and suspension flight loads are summarized. Finally, an advise to research the response of solid rocket motor under storage and transportation conditions is proposed as the reference in researching the structural integrity at the corresponding conditions.

Surface-to-Air Missiles′ Depot Maintenance and Support Capability Evaluation Based on Contractor

CHEN Jia-xi, YUAN Yan-bin, YUE Xiao-rui

2020, 48(1): 74-79. doi:10.3969/j.issn.1009-086x.2020.01.012

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The depot maintenance and support is one of the important guarantees of weapon effectiveness. As sophisticated equipment, the depot maintenance and support of the surface-to-air missiles. The main missions and the evaluation parameters of the surface-to-air missiles′ depot maintenance and support capability are analyzed and classified. The access permissions of contractor are listed, and a method based on mission evaluation matrix model and contractor support is proposed for evaluating the depot maintenance and support capability which provide useful reference for military selection and evaluation. Finally a case application of this evaluation method is given.

RMS Requirements Demonstration and Evaluation Technology of Complex Equipment System

FAN Yong-xin, PAN Xing, WANG Ke, ZHANG Yan-mei, GUO Xiao-feng

2020, 48(1): 80-88. doi:10.3969/j.issn.1009-086x.2020.01.013

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Aiming at the demonstration and evaluation characteristics of systematic reliability,maintainability and supportability (RMS) requirements on complex equipment systems,through the research on RMS requirements, capability analysis, architecture analysis,simulation and evaluation of equipment system, the procedures and techniques for demonstrating and evaluating the RMS requirements of complex equipment systems are proposed. The idea of software platform architecture based on the above technology is given, which provides ideas and methods for carrying out the demonstration and evaluation of the RMS requirements of the complex equipment system that emphasizes systemization and actualization.

Supportability Evaluation Model of Radar Equipment Based on Improved Catastrophe Progression Method

SHI Duan-yang, HU Bing, CHEN Jia-xun, DONG Xing-yang

2020, 48(1): 89-94. doi:10.3969/j.issn.1009-086x.2020.01.014

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In view of the factors affecting the supportability of radar equipment are numerous and hierarchical, according to the requirement of radar equipment supportability, an index system of supportability evaluation of radar equipment is constructed. The comprehensive adjustment method is used to adjust the initial comprehensive value, so as to improve the problem that the overall comprehensive evaluation value in the catastrophe progression method is close to one, thus more intuitively reflect the size and level of the evaluation value. A supportability evaluation model of radar equipment based on improved catastrophe progression method is designed. The example shows that this method can evaluate the supportability level of the radar equipment scientifically and effectively.

Design Method of Improving the Near Field Measurement Isolation

SHEN Xiao-ling, FENG Xiao-bin, ZHANG Da-kai, LIU Yin-kai, ZHANG Yun, FENG Yu

2020, 48(1): 95-99. doi:10.3969/j.issn.1009-086x.2020.01.015

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In the measurement of near field electromagnetic scattering characteristics, the transmitter′s high-power signal enters the receiver directly or after reflection, which is easy to cause the receiver block. After power amplifier, emission signal waveform changed and got a long tail, the tail and the target scattering echo signal enter into the receiver at the same time, the echo signal will be seriously affected by the trailing. Above problem will lead to the insufficient of receiver dynamic range and the measuring capability of the system is influenced. A method with time domain filtering and optimization design of antenna is proposed, which improves the receiver isolation of the near-field electromagnetic scattering characteristics of measuring and the low radar cross-section (RCS) measurement.

Preliminary Exploration on Application of Parallel System Theory in Systemic Confrontation Training

XIE Tang-tao, YI Fang, MEI Guang-kun

2020, 48(1): 100-106. doi:10.3969/j.issn.1009-086x.2020.01.016

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The necessity of systemic confrontation training is sketched, and the artificial system construction, computing experiments and parallel implement in systemic confrontation training are preliminary modeled and analyzed through the artificial systems, computing experiments, parallel implement (ACP) methods of parallel system theory. The result shows that the elements of actual system should be projected to virtual battle space to construct artificial system (natural elements and troops should be projected via digital twin technology and agent based simulation method respectively), so that warlike operations effect can be projected easily. Solutions to construct practicable systemic confrontation training system are given from preliminary exploration on how to carry out computing experiments and how to execute parallel implement in systemic confrontation training.

Improved Swarm Intelligence Algorithm for Multi-Objective Jamming Decision

CHEN Yi-qi

2020, 48(1): 107-112. doi:10.3969/j.issn.1009-086x.2020.01.017

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How to use limited resources to obtain maximum benefits is one of the focuses in electronic warfare. For multi-target collaborative electronic countermeasures, an optimism assignment method of jamming resource is put forward, to solve the problem that jamming resource is generally not equal to the radar number. Aiming at the detection probability and positioning accuracy of the netted radar, a jamming decision task model based on multi-objective optimization is established. To solve the problem that the convenience rates of traditional artificial bee colony algorithm and ant colony algorithm are slow, crossover operation with optimal solution to current iteration is adaptively added, the general improvement strategy is put forward, and through the simulation experiment, the better rate of convergence of the algorithm is proved.

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