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Beijing, China

Feng D.,Anhui University of Technology | Duan D.,Anhui University of Technology | Jiang S.,Anhui University of Technology | Su P.,Anhui University of Technology | And 4 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams

An experiment in view of repetitive frequency electromagnetic pulse (EMP) interference, take the hydrogen thyratron trigger as research object, is carried out to study the interference of the hydrogen thyratron first grid and second grid under the condition of suspension and mutual ground. The results show that the two grids have intense electromagnetic interference (EMI), and the interference is mainly caused by space electromagnetic radiation and coupling of mutual ground. The experiments are separately carried out under the EMP environment with different repetitive frequency quantity and time interval. The results show that the two cases have impact on tube trigger, increasing repetitive frequency EMP quantity and reducing EMP interval both increase the probabilities of false trigger. Comparing with the theoretical analysis and the experiment results, it is concluded that this phenomenon is caused by repetitive frequency accumulation effect and high frequency component strengthen which leads to enhanced coupling. Source

Wang H.,Academy of Equipment Command and Technology | Wang P.,Academy of Equipment Command and Technology | Ren Y.,Academy of Equipment Command and Technology | Chen X.-C.,PLA Unit 63961
Yuhang Xuebao/Journal of Astronautics

Aimed at the interaction problems between accuracy and bandwidth of spacecraft attitude measurement, this paper presents a spacecraft attitude measurement method with high precision and high bandwidth based on magnetically suspended control moment gyroscope (MSCMG). According to the rigid body dynamics and the principle of coordinate transformation, a magnetically suspended rotor radial torque model is established. When the frame is motionless, through real-time detecting magnetic bearing current and rotor displacement, get magnetically suspended rotor radial total torque and radial deflection information, then the magnetically suspended rotor radial torque caused by spacecraft motion is obtained. According to the magnetically suspended rotor radial torque expressions caused by the spacecraft motion, analytical expressions are presented for spacecraft attitude angle velocity and attitude angle acceleration in single direction. Verified by simulation in different bandwidth, the current measurement method can detect spacecraft attitude angle velocity and angle acceleration in single direction, and meet high-precision and high-bandwidth requirements. © 2016, Editorial Dept. of JA. All right reserved. Source

Zhang J.,Nanjing University of Science and Technology | Zhang J.,PLA Unit 63961 | Wang Z.-X.,PLA Unit 63961 | Chen L.,PLA Unit 63961 | And 2 more authors.
Binggong Xuebao/Acta Armamentarii

In antiaircraft weapon-target assignment, the weapon resources could be wasted if all weapons are fully assigned at a time. In view of this situation, a weapon-target assignment model of multiple interception opportunity is proposed. The model is used to screen the weapon groups for multiple interception based on flying time of target approaching to a weapon unit, and the weapon units in the weapon group intercept the target according to the time order. The model not only optimizes the target damage probability, but also considers the consumption of weapon resources. Based on the model, a mixed chaos and discrete particle swarm optimization algorithm is presented to solve the weapon-target assignment problem. The proposed algorithm improves the seeking ability for the global optimal solution so that the local extremum is avoided. Simulation results show the rationality of the weapon-target assignment model and the effectiveness of the proposed mixed optimization algorithm, which is a new thought for antiaircraft weapon-target assignment. ©, 2014, China Ordnance Society. All right reserved. Source

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