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Research on Missile Equipment Health Management System for After-Sales Support
Haijin HUANG, Han JI, Xiaojia LIU, Bo YANG, Ning WANG
Modern Defense Technology    2023, 51 (1): 75-85.   DOI: 10.3969/j.issn.1009-086x.2023.01.010
Abstract6277)   HTML337)    PDF (3068KB)(254)       Save

With the continuous improvement of war informatization, systematization and intelligence, the demand of military users for missile equipment support has changed from post maintenance and regular maintenance to condition-based maintenance and intelligent support, which puts forward higher requirements for missile equipment health management. Through the demand analysis of missile equipment health management system, this paper puts forward the overall system architecture for missile equipment support, the system physical architecture for complex application scenarios in military plants and the system technical architecture based on micro-service, and carries out the system function modules by using structural design method, describes the key technologies of the system, constructes and applies the first phase of the system for the pilot equipment. The application results show the feasibility of this study, which can provide reference for the health management of other types of equipment.

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Frequency Shift Interference Suppression Method Based on Frequency Estimation and Signal Reconstruction
Shan-shan JIN, Xin LI, Chen LIU
Modern Defense Technology    2022, 50 (6): 97-102.   DOI: 10.3969/j.issn.1009-086x.2022.06.012
Abstract4248)   HTML213)    PDF (928KB)(231)       Save

Frequency shift interference can produce high fidelity false targets for the range-Doppler coupling characteristic of LFM signal. According to the peak characteristics of pulse echo by compression and the principle of dechirp, the interference suppression method based on signal reconstruction and cancellation is proposed. Firstly, the frequency of the signal by dechirp is estimated, and the dechirp interference signal is reconstructed. Secondly, the normalized average detection threshold is defined for the dechirp signal, and the minimum threshold is used as the objective function of interference suppression. Finally, the interference suppression factors corresponding to the minimum normalized average monitoring threshold are calculated by global search, and interference suppression is realized by cancellation. The simulation shows that the energy of residual interference component is more than 20 dB lower than that of target echo in the output signals by pulse compression, which shows the proposed method can suppress multi-frequency shift interference effectively.

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Reentry Attitude Control Based on Fault Adaptive Sliding Mode Control
HAN Jia-jun, WANG Xiao-hu, WU Xu-zhong
Modern Defense Technology    2018, 46 (6): 51-56.   DOI: 10.3969/j.issn.1009-086x.2018.06.008
Abstract210)      PDF (996KB)(950)       Save
In order to satisfy the requirements of reentry vehicle attitude control under the uncertain fault and improve the robustness and adaptability of reentry control, a fault detection strategy and a attitude control method with actuator fault are introduced.For the dynamic model of reentry vehicle in fault case, a fault detection scheme is proposed by designing a nonlinear fault detection observer.An active tolerant tracking strategy is presented by making use of both adaptive control and sliding mode control techniques.Finally, simulation results are given to demonstrate the effectives of the developed fault tolerant control scheme.
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Early Warning Information Generation Method for High Orbit Early Warning Satellite
ZHOU Tong, ZHANG Ya-sheng, ZHOU Hai-jun, HAN Jing-bin
Modern Defense Technology    2018, 46 (6): 15-23.   DOI: 10.3969/j.issn.1009-086x.2018.06.003
Abstract801)      PDF (2328KB)(1327)       Save
Aiming at the process of transition between high orbit early warning satellites and long range early warning radars in the course of missile defense, two issues were investigated: ballistic error propagation and missile warning information representation. The calculation process of ballistic error propagation using CADET was described. For the results of the error propagation, four kinds of early warning information models, which included the probability ellipsoid model, the probability spherical model, the uniform ellipsoid model, and the uniform sphere model were proposed. The missile warning information of different granularities was calculated using the four models. The simulation results showed that the early warning information models established described the missile state more fully.
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