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长春光学精密机械与... [39]
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会议论文 [41]
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Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE)
会议论文
OAI收割
2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China
作者:
Li Z.
;
Li Z.
收藏
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浏览/下载:49/0
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提交时间:2013/03/25
Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness
strength and thermal dimensional stability
some factors such as support scheme
materials selection
lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge
influences of gravity
assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively
the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz
which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications
Switzerland.
Longitudinal control law design and simulation of fixed-wing UAV (EI CONFERENCE)
会议论文
OAI收割
2012 International Conference on Measurement, Instrumentation and Automation, ICMIA 2012, September 15, 2012 - September 16, 2012, Guangzhou, China
作者:
Duan Z.
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浏览/下载:30/0
  |  
提交时间:2013/03/25
Taken some fixed-wing UAV as the study object
the aircraft movement was broken down into the longitudinal movement and lateral movement according to the linearized small perturbation principle
the longitudinal control law design method was discussed using root locus which belonged to classical control theory. The six degrees of freedom nonlinear model simulation result shows that: the control parameters designed are reasonable
the simulation profile is fully consistent with the setting profile
the control effect of pitch angle loop and altitude loop meets with the indices requirements
the method is mature and reliable
easy to realize in engineering. (2013) Trans Tech Publications
Switzerland.
STEP Mission: Search for Terrestrial Exo-Planets
会议论文
OAI收割
European Planetary Science Congress 2013,, London, UK, 2013
Chen D.
;
Wu
;
J.
;
Li B.
收藏
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浏览/下载:35/0
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提交时间:2014/04/30
Search for Terrestrial Exo-Planest (hereafter STEP) mission is a latest advanced research project in Chinese Strategic Pioneer Program (SPP) on Space Science. STEP aims at the nearby earth-alike planets detection
comprehensive research on the planetary system and some astrometry research with 0.5 uas precision in the space
which will get the fruitful achievements in the exo-planetary and astrometry research fields. STEP will take the Space Astrometry technique in the optical band. The FOV is 0.44 degree
based on 1.2m primary and focus length is 50m. The special metrology technique will be taken to reach 0.5 uas astrometry precision
which will be idea for terrestrial exo-planets detection. The mission will take the L2 orbit.
Communication synchronization in wireless optical link (EI CONFERENCE)
会议论文
OAI收割
2012 International Conference on Control Engineering and Communication Technology, ICCECT 2012, December 7, 2012 - December 9, 2012, Shenyang, Liaoning, China
作者:
Guo J.
;
Guo J.
;
Wang H.
;
Wang H.
;
Wang H.
收藏
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浏览/下载:36/0
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提交时间:2013/03/25
An FPGA based transceiving synchronization method is demonstrated for Free Space Optical (FSO) communication system
which is discussed separately as the transmitting protocol and the receiving protocol. During the discussion of these two parts
the co-operation of them is also discussed. The transmitting protocol interfaces the outer input data with a parallel port
buffers the input data
encodes the input data stream
serializes the parallel data and outputs the serialized data. It also has an output management unit to manage the activity of each part of the transmitting protocol. The receiving protocol filters and synchronizes the input serial data stream
parallels the serial data stream
decodes the input data
checks received error
handles transmission exception and interfaces the outer receiver with a parallel port. The entire transceiving protocol could be programmed into a single FPGA chip to improve system integrity and reduce the system cost. The presented protocol could be taken as "protocol transparent" for outer interfaces
meaning that when interfacing the presented system to an outer system
users don't have to consider what protocol the outer system transceiving data stream is under
for example
the TCP/IP protocol or anything else
in the case that its I/O interface is a parallel port. Simulation and final experiment prove that the protocol presented is a working solution at a certain bit rate scale. 2012 IEEE.
Analysis of zenith pass problem and tracking strategy design for roll-pitch seeker (EI CONFERENCE)
会议论文
OAI收割
作者:
Jiang H.
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浏览/下载:22/0
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提交时间:2013/03/25
Roll-pitch seeker is currently applied in particular missiles. There is a stubborn problem called zenith pass problem while roll-pitch seeker is used. Analysis of the zenith pass problem which always results in loss of target is presented in this paper. Based on the analysis result
tracking strategy is carried out to deal with zenith pass problem. To prove the validity of tracking strategy
a practical roll-pitch seeker was accomplished. Model identification and common PID controllers for the physical roll-pitch seeker are taken on
after that
both disadvantages derived from zenith pass problem in tracking process and meliorated phenomenons by the tracking strategy are shown. It is concluded that the tracking strategy designed for solving the zenith pass problem is efficient. 2011 Elsevier Masson SAS. All rights reserved.
Classification of hyperspectral image based on SVM optimized by a new particle swarm optimization (EI CONFERENCE)
会议论文
OAI收割
2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2012, June 1, 2012 - June 3, 2012, Nanjing, China
作者:
Gao X.
;
Yu P.
;
Yu P.
收藏
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浏览/下载:26/0
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提交时间:2013/03/25
Support Vector Machine (SVM) is used to classify hyperspectral remote sensing image in this paper. Radial Basis Function (RBF)
which is most widely used
is chosen as the kernel function of SVM. Selection of kernel function parameter is a pivotal factor which influences the performance of SVM. For this reason
Particle Swarm Optimization (PSO) is provided to get a better result. In order to improve the optimization efficiency of kernel function parameter
firstly larger steps of grid search method is used to find the appropriate rang of parameter. Since the PSO tends to be trapped into local optimal solutions
a weight and mutation particle swam optimization algorithm was proposed
in which the weight dynamically changes with a liner rule and the global best particle mutates per iteration to optimize the parameters of RBF-SVM. At last
a 220-bands hyperspectral remote sensing image of AVIRIS is taken as an experiment
which demonstrates that the method this paper proposed is an effective way to search the SVM parameters and is available in improving the performance of SVM classifiers. 2012 IEEE.
The design problems of one kind of chaotic one-way hash function (EI CONFERENCE)
会议论文
OAI收割
2012 4th International Conference on Multimedia and Security, MINES 2012, November 2, 2012 - November 4, 2012, Nanjing, Jiangsu, China
Li P.
;
Zhang M.
;
Shi J.
收藏
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浏览/下载:26/0
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提交时间:2013/03/25
The construction method of one kind of one-way hash function based on 1-D Logistic map is analyzed. The design problem and some collision problems are pointed out. By using the dictionary attack
the collision probability of the arithmetic realized with signal floating point numbers is 2-23
and the collision probability of the arithmetic realized with double floating point numbers is 2-55. The reasons for these design problems are discussed
and some key problems are pointed out which should be taken care of while constructing one-way hash function based on a digital chaotic map. 2012 IEEE.
Use skill of external memory expansion for DSP of TMS320VC5409 (EI CONFERENCE)
会议论文
OAI收割
2012 International Meeting on Opto-Electronics Engineering and Materials Research, OEMR 2012, July 27, 2012 - July 29, 2012, Shenyang, Liaoning, China
作者:
Huang L.
收藏
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浏览/下载:29/0
  |  
提交时间:2013/03/25
This paper proposes the external data memory and program memory using skills for DSP of TMX320VC5409. Firstly
the memory allocation of TMX320VC5409 is described and the its assembly line operation is analyzed. Secondly
the external program memory space memory structure and external data memory and program memory extension using skills are discussed. Finally
the IS61LV12816 is taken as an example to design the external memory expansion of the hardware and software. The practice has proved that the mode has great flexibility and practicality. (2012) trans tech publications
switzerland.
Image quality assessment based on gradient complex matrix (EI CONFERENCE)
会议论文
OAI收割
2012 International Conference on Systems and Informatics, ICSAI 2012, May 19, 2012 - May 20, 2012, Yantai, China
作者:
Wang Y.
;
Wang Y.
;
Wang Y.
;
Wang Y.
;
Wang Y.
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2013/03/25
An image quality assessment model based on gradient complex matrix is proposed. The vertical and horizontal gradient information of grayscale image is calculated. Complex number is used to construct the measuring matrix. Singular value decomposition is performed in order to obtain the main structure information of the image. The singular value feature vectors of the image gradient complex matrices corresponding to the reference image and the distorted image are used to measure the structural similarity of the two images. PSNR is taken as a tool to evaluate the gradient distribution similarity. Their properties are analyzed by using LIVE database and nonlinearity regression function. 2012 IEEE.
Spanwise stretching and collapse motions stabilize leading-edge vortex in slow-flying bats
会议论文
OAI收割
23rd International Congress of Theoretical and Applied Mechanics, 中国北京/Beijing, China, 2012-08-19
作者:
Wang SZ(王士召)
;
He GW(何国威)
;
Zhang X(张星)
收藏
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浏览/下载:26/0
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提交时间:2014/04/02
stretching
stabilize
flying
leading
collapse
vortex
oscillating
stable
slowing
still
simulate
observed
morphology
around
motion
where
taken
method
study