The First Aeronautical Institute of Air Force

Xinyang, China

The First Aeronautical Institute of Air Force

Xinyang, China
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Zhao J.,Nanjing University of Aeronautics and Astronautics | Zhao J.,The First Aeronautical Institute of Air Force | Shen M.,Hohai University | Zhu D.,Nanjing University of Aeronautics and Astronautics
Shuju Caiji Yu Chuli/Journal of Data Acquisition and Processing | Year: 2016

Airborne radar with uniform circular array (UCA) antennas has the merits of all-orientation space scanning, joint elevation-azimuth estimation, and good beamform when the beam center deviates from the normal of the array. But the clutter distribution of UCA varied with ranges and received data in different range cells are not independently identically distributed (IID) samples for its geometry specialty, which results in the significant degradation in traditional space time adaptive processing (STAP) method. A new STAP method, namely exponent derivative based updating algorithm, is proposed. In the method, the change of adaptive weight is supposed as an exponential function and the range-dependency of UCA can be effectively reduced by extending the received data vectors. Simulation results verify that the proposed method outperforms significantly both localized processing and range-dependency compensation methods, as well as the traditional derivative-based updating algorithm. © 2016 by Journal of Data Acquisition and Processing.


Dong J.,PLA Air Force Aviation University | Dong J.,The First Aeronautical Institute of Air Force | Zhang G.-J.,PLA Air Force Aviation University | Zhang G.-J.,Xi'an University of Science and Technology | And 2 more authors.
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2013

The function projective synchronization and parameter identification between the fractional-order chaotic system and hyper-chaotic system with uncertain parameters are researched, in which the fractional-order Chen chaotic system and the new fractional-order hyper-chaotic system are as examples. First, based on the fractional theory of stability and nonlinear dynamic theory, the nonlinear controller and parameter identification rules are designed. And by the nonlinear controller the function projective synchronization between the fractional-order 3D chaotic system and 4D hyper-chaotic system with uncertain parameters are realized. At the same time, the uncertain parameters are identified. Second, based on the fractional-order theory of stability the synchronization are proved strictly in mathematics. Finally, by the Predictor-Corrector scheme numerical simulation, the validity of the presented method is verified.


Li R.,PLA Air Force Aviation University | Zhang G.-J.,PLA Air Force Aviation University | Zhu T.,PLA Air Force Aviation University | Wang X.-J.,PLA Air Force Aviation University | Dong J.,The First Aeronautical Institute of Air Force
Applied Mechanics and Materials | Year: 2014

In order to improve the security of secure communication, a novel generalized hybrid dislocated function projective synchronization (GHDFPS) was proposed and GHDFPS of time delay chaotic systems with uncertain parameters were researched in this paper. Due to time delay, the chaotic system can produce multiple positive Lyapunov exponential; this characteristic can enhance security in secure communications noticeably. Based on Lyapunove stability theory and modified hybrid feedback control method, the modified hybrid feedback controller and the parameter updating laws were designed for the GHDFPS between the two time delay chaotic systems with uncertain parameters. The feedback gain can be adjusted automatically according to the synchronization error values. Under the controller, generalized hybrid dislocated function projective synchronization of the two chaotic systems is achieved, and the uncertain parameters of response systems are identified. The chaotic item is added in the function scale factor. The chaotic item in the function scaling factor makes function scaling factor more complex and unpredictable. So this can enhance the features of indeterminism in secure communication. The time delay feedback Lorenz system as an example; by numerical simulations the effectiveness of the proposed method is demonstrated. © (2014) Trans Tech Publications, Switzerland.


Wang Q.,The First Aeronautical Institute of Air Force | Yang F.,The First Aeronautical Institute of Air Force | Nong X.,97455 Army | Huang Y.M.,The First Aeronautical Institute of Air Force
Advanced Materials Research | Year: 2014

This paper introduces the design points of the numerical control all attitude combined gyroscope test turntable. This Test table includes the course and pose angle given system, heading and attitude angle testing system and three weeks of servo system Heading and attitude angle of a given system using ZAZ1413 angle digital conversion module. Heading and attitude angle measurement system using SZZ1413 angle conversion module. © (2014) Trans Tech Publications, Switzerland.


Xu Y.,Xinyang Power Supply Corporation | Xu Y.,The First Aeronautical Institute of Air Force | Jun Z.,Xinyang Power Supply Corporation | Jun Z.,The First Aeronautical Institute of Air Force
Advanced Materials Research | Year: 2013

The 2D spectrum estimation based on uniform linear array is studied in this paper. MUSIC method is firstly introduced into array signal processing to realize the frequency and angle joint estimation. And the modified MUSIC method is then applied for two dim array signal processing to fulfill joint parameters estimation of coherent signal sources. Simulation results show the validity of the proposed method. © (2013) Trans Tech Publications, Switzerland.


Chen M.H.,The first Aeronautical Institute of Air Force | Yang H.C.,The first Aeronautical Institute of Air Force | Du X.W.,The first Aeronautical Institute of Air Force | Yang B.S.,The first Aeronautical Institute of Air Force
Advanced Materials Research | Year: 2014

Titanium alloy Ti-1023 is difficult to machine because of its high strength, chemical reactivity and low thermal conductivity. And it have tool wear and chipping due to its poor machinability. The relationship between milling force, tool life and milling parameters by adopting single-factor experimentation method is studied, The optimized milling parameters are selected, and processing efficiency is improved. The result shows: The appropriate cutting parameters of Titanium alloy Ti1023 are cutting speed Vc=15~20m/min, feed per tooth fz=0.12~0.18mm, depth of cut (DOC) ap=4~7mm; Besides, when the unit positive pressure of the cutting edge surpasses 320N, chipping is likely to happen on the blade. © (2014) Trans Tech Publications, Switzerland.


Xin G.,The First Aeronautical Institute of Air Force | Chen W.,The First Aeronautical Institute of Air Force | Tao J.,The First Aeronautical Institute of Air Force
Advanced Materials Research | Year: 2012

Applying neutral network-sliding model control design methods to large envelope flight control law of aircraft whose model parameter varies greatly with flight condition was studied in this paper. Neural network theory is used to approximately linearize the nonlinear system and cancel the errors brought with approximate inversion, and the residual error is solved by sliding model control. So it can approximate the nonlinear model accurately, and improve robustness and anti-jamming capability of the flight control system. Simulation results show the design neural network - sliding model large envelope flight controller has excellent control performance. © (2012) Trans Tech Publications, Switzerland.


Zhang W.J.,The First Aeronautical Institute of Air force | Ma H.,The First Aeronautical Institute of Air force | Tan D.M.,The First Aeronautical Institute of Air force
Advanced Materials Research | Year: 2014

It can not be avoided that composite blade may be damaged duiring using. The detecting and repairing methods of helicopter composite blade damage, and the experiment after repair are introduced in this paper. The technique problems in detecting and repairing of helicopter composite blade damage are solved. Helicopter blade functions to produce aerodynamics for the flight of helicopter and to change or maintain the flying state of helicopter[1]. It can not be avoided that composite blade may be damaged when helicopter is in use, which will affect the flight performance and safety of helicopter. It is significant to study the testing method of helicopter composite blade damage and the repair method of composite blade to improve helicopter maintenance support and ensure helicopter flight safety. The composite blade, mentioned in this paper, is made of carbon cloth, glass cloth, unidirectional glass fiber strip and filling foam. © (2014) Trans Tech Publications, Switzerland.


Zhou T.,The First Aeronautical Institute of Air Force | Dong J.,The First Aeronautical Institute of Air Force
Applied Mechanics and Materials | Year: 2012

In the system of terrain following, after planning the optimal reference path, the key problem is the design of advanced path tracking system, there were many optimal path tracking schemes presented previously, but, they have the common characteristics of complicated arithmetic and tremendous calculating quantity, so, in the paper, for the sake of attaining simple and precise controller, adopting output predictive control to calculate control instructions and applying fuzzy inference to compensate the controlled quantity make fighter track the planned optimal reference path automatically, plenty of numeral simulation referring to various typical terrains shows that the scheme is feasible. © (2012) Trans Tech Publications, Switzerland.


Wang Q.,The First Aeronautical Institute of Air Force | Yang F.,The First Aeronautical Institute of Air Force | Huang Y.M.,The First Aeronautical Institute of Air Force
Applied Mechanics and Materials | Year: 2014

The article introduced the necessity of the develop for synthetically test-platform system of aero instrument. The form and design of the system was introduced from the view of software and hardware. The adoptive main technique was offered in the process of systemic design. © (2014) Trans Tech Publications, Switzerland.

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