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Song J.-H.,Harbin Institute of Technology | Song S.-M.,Harbin Institute of Technology | Xu S.-L.,Shanghai Institute of Electro mechanical Engineering
Yuhang Xuebao/Journal of Astronautics | Year: 2016

For the problem of multiple missiles cooperatively intercepting a maneuvering target, based on finite-time consensus theory, a novel cooperative guidance law with impact angle constraints is proposed. Firstly, the multiple-missile cooperative guidance model with impact angle constraints is constructed. We subsequently divide the process of cooperative guidance law design into two stages. In the first stage, with the use of the finite-time consensus theory, integral sliding mode and adaptive control, the acceleration command on the line-of-sight (LOS) direction is developed to guarantee that all missiles simultaneously intercept the maneuvering target in finite time. In the second stage, based on the sliding mode control and the non-homogeneous disturbance observer, the acceleration command on the normal direction of the LOS is designed to guarantee that the LOS angular rate between each missile and the target converges to zero and the LOS angle converges to the desired terminal LOS angle. Finally, simulation results for the interception scenario of three missiles intercepting a maneuvering target are provided to demonstrate the effectiveness and superiority of the proposed cooperative guidance law with impact angle constraints. © 2016, Editorial Dept. of JA. All right reserved.


Tian Y.,Beijing Institute of Technology | Tian Y.,Shanghai Institute of Electro Mechanical Engineering | Tian Y.,Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology | Sun G.,Beijing Institute of Technology | And 7 more authors.
Applied Optics | Year: 2014

The design method of an infrared/millimeter wave mirror array type of beam combiner was investigated. The beam combiner was composed of a support plate, air gap, and mirror array. It had two advantages: one was that the size of the beam combiner could beextended bysplicing more mirrors; the other was that the millimeter wave passband could be tuned by adjusting the thickness of the air gap. The millimeter wave and infrared structure was designed by using transmission line theory and optimized by a simplex Nelder-Mead method. In order to analyze the influence of deformation on performance, the mechanical characteristics of the mirrors and support plate were analyzed by the finite element method. The relationship between the millimeter wave transmission characteristics and the air gap was also analyzed by transmission line theory. The scattered field caused by pillars was computed by the multilevel fast multipole method. In addition, the effect of edge diffraction on the near field uniformity was analyzed by the aperture field integration method. In order to validate the mirror array splicing principle and the infrared imaging performance, a prototype of the mirror array was fabricated and tested. Finally, the infrared images reflected by the mirror array were obtained and analyzed. The simulation and experiment results validated the feasibility of the mirror array beam combiner. © 2014 Optical Society of America.


Xiao H.,Harbin Institute of Technology | Zuo B.,Harbin Institute of Technology | Tian Y.,Beijing Institute of Technology | Tian Y.,Shanghai Institute of Electro mechanical Engineering | And 7 more authors.
Applied Optics | Year: 2012

We investigated the joint influences exerted by the nonuniform aerodynamic flow field surrounding the optical dome and the aerodynamic heating of the dome on imaging quality degradation of an airborne optical system. The Spalart-Allmaras model provided by FLUENT was used for flow computations. The fourth-order Runge-Kutta algorithm based ray tracing program was used to simulate optical transmission through the aerodynamic flow field and the dome. Four kinds of imaging quality evaluation parameters were presented: wave aberration of the exit pupil, point spread function, encircled energy, and modulation transfer function. The results show that the aero-optical disturbance of the aerodynamic flow field and the aerodynamic heating of the dome significantly affect the imaging quality of an airborne optical system. © 2012 Optical Society of America.


Tian Y.,Beijing Institute of Technology | Tian Y.,Shanghai Institute of Electro Mechanical Engineering | Li Q.,Shanghai Institute of Electro Mechanical Engineering | Zhang L.,Shanghai Institute of Electro Mechanical Engineering | Li Z.,Beijing Institute of Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

In order to meet high temperature, high dynamic range, high resolution requirements of infrared imaging guidance seeker to target simulator in the hardware-in-the-loop, a new infrared space light modulator was proposed, based on the narrow band, high extinction ratio, and high dynamic range characteristics of one-dimensional photonic crystal. The optics transfer characteristics of one-dimensional photonic crystal was analyzed and simulated. The relation between transmittance and normalized frequency and the effect of changing layer number, periodical optical path and optical index on the band gap were analyzed in detail. The optics transfer characteristics of one-dimensional photonic crystal with center defect was aslo analyzed and simulated. The results of calculation provide theoretical support for the new technology.


Tian Y.,Beijing Institute of Technology | Tian Y.,Shanghai Institute of Electro mechanical Engineering | Xu R.,Beijing Institute of Technology | Shi R.,Beijing Institute of Technology | And 4 more authors.
Applied Optics | Year: 2013

We investigated the design, optimization, and evaluation method of an infrared (IR)/microwave (MW) multilayered dielectric plate type of beam combiner. The MW multilayered dielectrics design theory and IR film design theory were unified using transmission line theory. The principles in designing the initial structure of a beam combiner were presented. An objective function was presented in optimizing the beam combiner. Six evaluation indices were constructed to evaluate the performance of the beam combiner. To verify the feasibility of the proposed method an example was given. The results showed that the method could meet the joint design, optimization, and evaluation requirements of a beam combiner's IR and MWcharacteristics. Finally, the design, optimization, and evaluation procedure was summarized. © 2013 Optical Society of America.


Tian Y.,Beijing Institute of Technology | Tian Y.,Shanghai Institute of Electro Mechanical Engineering | Lv L.,Beijing Institute of Technology | Jiang L.,Beijing Institute of Technology | And 7 more authors.
Applied Optics | Year: 2013

We investigated the design method of an infrared (IR)/microwave (MW) micromirror array type of beam combiner. The size of micromirror is in microscopic levels and comparable toMWwavelengths, so that the MWwill not react in these dimensions, whereas the much shorter optical wavelengths will be reflected by them. Hence, theMWmultilayered substrate was simplified and designed using transmission line theory. The beam combiner used an IR wavefront-division imaging technique to reflect the IR radiation image to the unit under test (UUT)'s pupil in a parallel light path. In addition, the boresight error detected by phase monopulse radar was analyzed using a moment-of method (MoM) and multilevel fast multipole method (MLFMM) acceleration technique. The boresight error introduced by the finite size of the beam combiner was less than 1°. Finally, in order to verify the wavefront-division imaging technique, a prototype of a micromirror array was fabricated, and IR images were tested. The IR images obtained by the thermal imager verified the correctness of the wavefront-division imaging technique. © 2013 Optical Society of America.


Chen G.,Nanjing University of Science and Technology | Xu L.,Shanghai Institute of Electro Mechanical Engineering | Su Z.,Nanjing University of Science and Technology
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2016

There are still some issues existing in current path planning of UAV, such as planning result simulation verification and 3D visualization. To solve the problems, a 3D real-time visualization and simulation platform for collaborative path planning of UAV was proposed. The target area was divided and calculated. The reconnaissance beam of UAV was modeled with virtual camera, the intersection points obtained quickly based on graphics hardware. The terrain mesh was calculated by scan-line polygon filling algorithm, reconnaissance information was recorded and analyzed, and the color temperature maps were given. Through the actual operation by the simulation platform, simulation results verify that the simulation platform provides a practical means of visualization simulation and verification for traditional collaborative path planning. © 2016, The Editorial Board of Journal of System Simulation. All right reserved.


Wang X.,Nanjing University of Science and Technology | Xu L.,Shanghai Institute of Electro Mechanical Engineering | Su Z.,Nanjing University of Science and Technology
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2016

To satisfy the need of air defense combat in the future, the concept of cooperative combat of new laser weapons and traditional anti-aircraft weapons was proposed. The simulation system based on HLA aimed to improve the performance of the system of traditional anti-aircraft weapons. The whole system was mainly divided into three parts: simulation platform, equipment simulation and three-dimensional simulation. Firstly, the object class and interaction class were designed according to federal members and federal integration. Then the important part was the three-dimensional modeling and simulation work of every weapon system. Finally, the air defense simulation system was realized on distributed simulation development platform DTS and OSG. The system was tested, and the process of system operation was showed. © 2016, The Editorial Board of Journal of System Simulation. All right reserved.


Li F.,Shanghai Institute of Electro Mechanical Engineering | Geng X.,Shanghai Institute of Electro Mechanical Engineering | Dong X.,Shanghai Institute of Electro Mechanical Engineering | Hong Z.,Shanghai Institute of Electro Mechanical Engineering
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

In order to improve the evaluation precision of countermeasure of IR guidance systems, a new method was proposed. The principle of multi-level fuzzy comprehension evaluation was analyzed, and a four level fuzzy comprehension evaluation was established. The result of the example under different simulation conditions shows its effectiveness. ©, 2015, Chinese Association for System Simulation. All right reserved.


Zhang L.,Shanghai Institute of Electro Mechanical Engineering | Tian Y.,Shanghai Institute of Electro Mechanical Engineering | Li Q.,Shanghai Institute of Electro Mechanical Engineering
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

In recent years, considerable progress has been made in the dynamic infrared scene projector at home and abroad. As a core part of hardware-in-the-loop system, the technical performance of dynamic infrared scene projector limits the performance of the whole simulation platform. The research status of dynamic infrared scene projector at home and abroad was summarized in this paper. The technical requirement of new type of dynamic infrared scene projector matching the infrared imaging precision-guided technology was prospected. In view of the development level of dynamic infrared scene projector, it's needed to explore hybrid infrared projection technology and intensify the research of new projector to solve the limitation on current projector.

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