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Fu B.-B.,Science Research Institute of China North Industries Group Corporation | Lei J.-M.,Beijing Institute of Technology | Wang D.-M.,China North System Engineering Institute
Binggong Xuebao/Acta Armamentarii | Year: 2010

On the base of theoretic analysis of gliding extended range, a mathematic model for exterior ballistics of gliding extended range guided munitions (ERGM) was established, and the maximum lift-to-drag ratio trajectory was simulated to obtain the ideal trajectory and actual trajectory. The simulation results were analyzed, and the improvement measures for the controlling system and the canard rudder surface shape were put forward to solve the oscillation problems of attack and attitude angles, thus assure the ERGM's stabilization of gliding flight.


Li R.,Unit 63961 | Lu G.-S.,Unit 63961 | Wang J.-F.,Science Research Institute of China North Industries Group Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

In order to enhance the precise attack ability and plan the development scheme of equipment for the army, the requirements were analyzed, and the system composition of the ground precise attack equipments was studied. The development trend was proposed according to status of some typical precise attack equipment of foreign army, such as tactical ballistic missile, precision guided munitions and antitank missile. Some suggestions on the development of ground precise attack equipments for our army are given on the basis of the analysis above.


Tang R.,Science Research Institute of China North Industries Group Corporation | Liu C.-Y.,China North System Engineering Institute | Zhang J.,Science Research Institute of China North Industries Group Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

It expounds the relationship between precise attack firepower system and future battlefield reinforcement support system and analyzes some key factors which can affect the firepower system. By analyzing their close relationship, it can be concluded that the development of precise attack firepower system should be focused on, and the coordinate development of multiple systems should also be paid attention to, in order to maximize the combat and operation effectiveness.


Shao Z.Y.,Beijing Institute of Technology | Feng Y.,Science Research Institute of China North Industries Group Corporation | Jin J.,Academy of Armored force Engineering | Bian J.N.,Beijing Institute of Technology
Advanced Materials Research | Year: 2014

The Unmanned Underwater Vehicle (UUV) is used more and more widely in military and non-military areas. Since UUV's navigation and motion control system is highly complex, a Hardware-In-the-Loop Simulation (HILS) system is designed and implemented to help research and development of its navigation and motion control system. The HILS system is mainly composed of real-time simulation computer, main control compute, GPS/Beidou satellite signal simulator, three-axis turntable, actuator load simulator, water pressure simulator, acceleration simulation unit, visual computer and interface devices. Performance specifications are allocated to each components of the HILS system according to dynamic characteristics of the UUV under complicated disturbances. Proximity between the results of the UUV's HILS and sea trial demonstrates the validity of the HILS system elementarily. © (2014) Trans Tech Publications, Switzerland.


Yu J.-Y.,China Academy of Space Technology | Huang D.,Science Research Institute of China North Industries Group Corporation | Liang C.-C.,China Academy of Space Technology | Wang B.,China Academy of Space Technology | And 2 more authors.
2016 IEEE International Conference on Mechatronics and Automation, IEEE ICMA 2016 | Year: 2016

An effective method is proposed for calculating the on-board real-time path planning of large-scale space redundant manipulators. Firstly, the 7-DOF manipulator kinematics model is described and analyzed, and the main computational process of path planning is presented. The homogeneous transformation matrices of various degrees of freedom are obtained through the telemetry joint angle, and is used to calculate the Jacobian matrix and the pseudo inverse for the angular velocity of each joint. Then, according to the theoretical analysis, the on-board hardware design structure based on FPGA computing is deduced, and the parallel matrix multiplication and inversion implementation structures are depicted, and the path planning computing data flow are given based on FPGA implementation. Finally, the path planning hardware implementation based on the FPGA is tested and the results are compared with the previous design. Compared to the previous design computing resources, speed and error, the proposed method with fewer resources occupied, fast calculation speed, and error can meet the on-board calculation and the experimental results show the effectiveness of the design. © 2016 IEEE.


Hu C.,Beijing Institute of Technology | Liu Z.-P.,Beijing Institute of Technology | Zeng T.,Beijing Institute of Technology | Fu B.-B.,Science Research Institute of China North Industries Group Corporation | Zhu Y.,China Academy of Space Technology
Binggong Xuebao/Acta Armamentarii | Year: 2010

The geosynchronous earth orbit synthetic aperture radar (GEO SAR) running in high orbit can capture high resolution radar image in hundreds or thousands of kilometers and offer a very effective way for target reconnaissance and accurate attack in wide swath. The large orbit height brings a lot of advantages, and causes a lot of imaging difficulties for GEO SAR. The conventional lower orbit SAR secondary range compression algorithms are based on the linear trajectory model or the Fresnel approximation. It will cause high order phase error of hundreds radians and result in severe spatial-variance in range direction when it is used in GEO SAR, thus the accurate focusing is difficult to be implemented under the conditions of long synthetic aperture time and large scene. An improved secondary range compression (SRC) algorithm to adapt the GEO SAR imaging requirements at perigee was proposed. Based on the accurate satellite curve trajectory model, the chirp rate of azimuth reference function was analytically derived, and its variance was adaptively compensated and the spatial-variance in range direction was overcome. Under the conditions of 100 seconds in synthetic aperture time and 40 km in distance, the simulation results verify the effectiveness of the algorithm proposed in this paper, and the highly accurate imaging can be implemented in GEO SAR.


Yu J.,China Academy of Space Technology | Huang D.,Science Research Institute of China North Industries Group Corporation | Zhao S.,China Academy of Space Technology | Pei N.,China Academy of Space Technology | And 2 more authors.
WIT Transactions on Engineering Sciences | Year: 2014

A real-time Stirling formula algorithm based on hardware acceleration is proposed. The large number is represented by the extended floating-point in the hardware design, and the hardware logic implementation for the Stirling formula is derived. By calculating the base 2 logarithm of the integer part and the fractional part, the result of the Stirling formula is divided into exponent and mantissa. The logarithm is derived by CORDIC, and the Taylor series is used to calculate the fractional power of 2. The proposed algorithm is implemented in FPGA, while the hardware block diagram and resources costs are deduced. The factorial results calculated by Matlab and FPGA based on the Stirling formula are compared and analyzed, while the proposed provides high accuracy and computing efficiency. © 2013 WIT Press.


Feng Y.,Beijing Institute of Technology | Feng Y.,Science Research Institute of China North Industries Group Corporation | Tao R.,Beijing Institute of Technology | Wang Y.,Beijing Institute of Technology
Science China Information Sciences | Year: 2012

The signal feature of propeller cavitation noise during acceleration or deceleration procedure can be used to passively detect and classify moving vessels and underwater vehicles in the port regions. By analyzing the chirp periodicity of the variation of propeller wake velocity under acceleration situation, this paper presents a time domain expression of the modulation envelope signal of the accelerating propeller noise, treating the signal as a Gaussian-shaped chirp periodic pulse train with increasing trend and fluctuating pulse amplitude. The paper investigates the characteristics of simplified fractional Fourier transform (SFRFT) spectrum of the chirp periodic signal, and thus obtains the relation between the chirp periodic signal and its chirp harmonics under the conditions of underwater passive detection. Furthermore, the experimental data of the cavitation tunnel satisfy the results obtained by simulation, which verifies the correctness of the proposed signal model. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.


Zhiyu S.,Beijing Institute of Technology | Yuan F.,Science Research Institute of China North Industries Group Corporation | Dongyang F.,Beijing Institute of Technology | Shunshan F.,Beijing Institute of Technology
Advanced Science Letters | Year: 2012

Small cylindrical object navigating near free-surface is subject to wave disturbance. Wave disturbance can dramatically influence the depth control of the near-surface navigating object. In order to diminish the wave disturbance, a self-regulating fuzzy depth control method based on the adaptive fuzzy control theory is proposed to keep the small cylindrical object navigate at the expected depth under free-surface. The near-surface dynamic model of the cylindrical object is introduced with the first and second order wave forces, and the fuzzy depth control model is presented. Hardware-in-loop simulation is designed to testify the validity of the control method. The results obtained by a series of hardware-in-loop simulations demonstrate that the self-tuning fuzzy depth control method performs well in stabilizing the near-surface navigating small cylindrical object and in keeping it in the expected depth under free-surface disturbances. © 2012 American Scientific Publishers All rights reserved.


Yao W.-J.,Science Research Institute of China North Industries Group Corporation | Chen L.,Science Research Institute of China North Industries Group Corporation
Binggong Xuebao/Acta Armamentarii | Year: 2010

The equipment system construction of airborne force is vital significant for improving its combat abilities. Based on the analysis and discussion of status and development trend of foreign airborne force, the differences and problems of native airborne force equipments are point out. Some suggestions on their system construction are proposed.

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