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Plasma edge density fluctuation measurements via lithium beam emission spectroscopy on EAST
期刊论文
OAI收割
PLASMA SCIENCE & TECHNOLOGY, 2022, 卷号: 24
作者:
Wu, Donggui
;
Hu, Guanghai
;
Zoletnik, S.
;
Xu, Guosheng
;
Ding, Siye
  |  
收藏
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浏览/下载:91/0
  |  
提交时间:2022/05/16
Li-BES
new filter
density fluctuation
2D turbulence
Study on infrared transparent radar double band-pass filter (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Mechatronics and Materials Processing, ICMMP 2011, November 18, 2011 - November 20, 2011, Guangzhou, China
Jia H. Y.
;
Feng X. G.
收藏
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浏览/下载:26/0
  |  
提交时间:2013/03/25
To realize the functions of infrared transparent as well as radar double- pass Band
A Y loop and Y slot compound element Frequency Selective Surface (FSS) structure is proposed
which takes an infrared transparent inductive mesh as a substrate. The proposed structure is analyzed based on Galerkin spectral method. The transitivity of infrared (3um-5um) as well as the radar double passed band with two resonance frequencies (31GHz and 54GHz) is discussed. The result reveals that this structure has function of infrared transparent as well as stable radar double-band filter with effective shielding effect on S-band and C-band radar electromagnetic waves. The design with multiple passband is suitable for radar/IR composite guidance and it also offers a kind of new thinking way of design for multi-mode compound guidance systems. 2011 Trans Tech Publications.
The research on adaptive measurement of angular acceleration for photoelectric servo turntable (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
作者:
Guo J.
;
Chen J.
;
Guo J.
收藏
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浏览/下载:26/0
  |  
提交时间:2013/03/25
The paper proposes a new measurement method of angular acceleration for photoelectric servo turntable. Piezoelectric angular acceleration sensor is used to measure angular acceleration directly
Adaptive FIR filter based on LMS algorithm is established on DSP
by which angular acceleration signal can be filtered and corrected errors adaptively
then angular acceleration signals can be measured adaptively. This method avoids measurement errors and calculation noise by computing angular acceleration indirectly
thus improving measurement precision and making measurement results better than traditional methods. The gotten angular acceleration can be sent to servo control mechanism as feed forward control signals to improve control effects of servo turntable significantly. 2011 IEEE.
The application of MATLAB/ embedded IDE Link CC in the design of DSP system (EI CONFERENCE)
会议论文
OAI收割
2011 4th International Conference on Intelligent Computation Technology and Automation, ICICTA 2011, March 28, 2011 - March 29, 2011, Shenzhen, Guangdong, China
Le S.
;
Shu-Mei Z.
;
Xin L.
收藏
  |  
浏览/下载:37/0
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提交时间:2013/03/25
In the development of new digital signal processing algorithms
Designers always use matlab simulation
when the simulation results achieve the expected target
then chang the algorithms into C/C++ languages and debug on hardware DSP. There are some results of deviation because of design
precision etc. Such a repeated process of revising all
will give developers inconvenience. This article takes designing FIR filter as an example to introduce method which use Embedded IDE LinkTM CC tool in Matlab7.6 environment to Debug TMS320F2812 DSP board. 2011 IEEE.
The new approach for infrared target tracking based on the particle filter algorithm (EI CONFERENCE)
会议论文
OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者:
Sun H.
;
Han H.-X.
;
Sun H.
收藏
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浏览/下载:63/0
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提交时间:2013/03/25
Target tracking on the complex background in the infrared image sequence is hot research field. It provides the important basis in some fields such as video monitoring
precision
and video compression human-computer interaction. As a typical algorithms in the target tracking framework based on filtering and data connection
the particle filter with non-parameter estimation characteristic have ability to deal with nonlinear and non-Gaussian problems so it were widely used. There are various forms of density in the particle filter algorithm to make it valid when target occlusion occurred or recover tracking back from failure in track procedure
but in order to capture the change of the state space
it need a certain amount of particles to ensure samples is enough
and this number will increase in accompany with dimension and increase exponentially
this led to the increased amount of calculation is presented. In this paper particle filter algorithm and the Mean shift will be combined. Aiming at deficiencies of the classic mean shift Tracking algorithm easily trapped into local minima and Unable to get global optimal under the complex background. From these two perspectives that "adaptive multiple information fusion" and "with particle filter framework combining"
we expand the classic Mean Shift tracking framework.Based on the previous perspective
we proposed an improved Mean Shift infrared target tracking algorithm based on multiple information fusion. In the analysis of the infrared characteristics of target basis
Algorithm firstly extracted target gray and edge character and Proposed to guide the above two characteristics by the moving of the target information thus we can get new sports guide grayscale characteristics and motion guide border feature. Then proposes a new adaptive fusion mechanism
used these two new information adaptive to integrate into the Mean Shift tracking framework. Finally we designed a kind of automatic target model updating strategy to further improve tracking performance. Experimental results show that this algorithm can compensate shortcoming of the particle filter has too much computation
and can effectively overcome the fault that mean shift is easy to fall into local extreme value instead of global maximum value.Last because of the gray and fusion target motion information
this approach also inhibit interference from the background
ultimately improve the stability and the real-time of the target track. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
Sort optimization algorithm of median filtering based on FPGA (EI CONFERENCE)
会议论文
OAI收割
2010 International Conference on Machine Vision and Human-Machine Interface, MVHI 2010, April 24, 2010 - April 25, 2010, Kaifeng, China
作者:
Li S.
收藏
  |  
浏览/下载:32/0
  |  
提交时间:2013/03/25
The traditional sorting algorithm of median filtering is optimized according to the hardware structure features of FPGA. FPGA is used to acquire the data parallelly for comparing the data of the same column in the median filtering window. Comparing results shared by adjacent filter window are saved temporarily to match the new round of median filtering by using FPGA internal resources. This method can reduce the comparing times from current 21 down to 13
and improve the algorithm efficiency nearly 40%.The experimental results prove that the optimized algorithm can filter a 1K1K gray-level image in about 20ms
which ensure the proposed algorithm can be applied in the real-time image median filtering system. 2010 IEEE.
The research on servo control technology of O-E theodolite based on angular acceleration sensor (EI CONFERENCE)
会议论文
OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Wei L.
;
Jin G.
;
Juan C.
收藏
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浏览/下载:24/0
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提交时间:2013/03/25
A new servo control methods for O-E theodolite is presented in this paper. The methods integrates optimally feed forward and feedback control
and adopts acceleration delay compensation based on velocity delay compensation
then achieves servo control of O-E theodolite effectively. Furthermore
Angular acceleration sensor is applied as information resources
and adaptive filter is formed to provide with feed forward control signal in the methods. For double closed loop servo control system of O-E theodolite
the location correction loop and velocity correction loop are analyzed and designed. Simulation and experimental results show that comparing with traditional methods
this servo control methods can improve significantly tracking precision and stability of O-E theodolite. 2010 IEEE.
Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE)
会议论文
OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者:
Zhang J.
;
Zhang J.
;
Zhang J.
;
Shi G.
;
Zhang X.
收藏
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浏览/下载:28/0
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提交时间:2013/03/25
Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus
which means the system MTF is quite insensitive to defocus
and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However
it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration
especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification
a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm
effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed
in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried
and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.
A 3-axis simulator for spacecraft attitude control research (EI CONFERENCE)
会议论文
OAI收割
2010 IEEE International Conference on Information and Automation, ICIA 2010, June 20, 2010 - June 23, 2010, Harbin, Heilongjiang, China
作者:
Dai L.
收藏
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浏览/下载:33/0
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提交时间:2013/03/25
This article presents the details of a new 3-axis simulator for spacecraft attitude control research and simulation. The air bearing allows the test bed to rotate about three axes with tiny friction. The attitude determination system consists of three fibre optical gyros
an inclinometer and a magnetometer. The actuator of the system consists of three reaction flywheels and four control moment gyros (CMG). Mathematical models of the sensors and actuators are given to help algorithm design. An extended Kalman filter was designed to provide attitude information for controller. Mathematical simulation results prove the attitude determination system can achieve high precision. A coulomb friction model of reaction wheels is given with experimental results. A friction compensation algorithm was developed to raise the pointing accuracy of the control system. The article also describes the details of the hardware structure. A PD stabilizing controller is implemented to test the validation of the whole control system at last. 2010 IEEE.
New phase measurement method for laser rangefinder (EI CONFERENCE)
会议论文
OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者:
Meng Z.
;
Meng Z.
收藏
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浏览/下载:31/0
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提交时间:2013/03/25
A new phase measurement method is designed and presented by using the technique of signal shifting phase and the technique of signal multiplication for laser rangefinder. The intensity of laser light is modulated by cosine circuit signal
at the same time the cosine circuit signal is thansformed sine signal by the shifting phase technique. Two signals mentioned above are multiplied by received signal from the target respectively
then being transmitted into signal processor after passing through low band filter respectively. The result of phase-shift between the received signal and sent signal is calculated by means of signal processor and time-counter with double frequency of modulation signal. The proposed system is composed of four units such as control and count unit
emitting and receiving unit of laser light
signal processing unit and result display unit. The two most advantages of proposed system over others are its ability of proper isolation which reduces crosstalk and its independency thermal drift. Theoretical calculations and experimental results have shown the accuracy better than 2 mm. 2010 Copyright SPIE - The International Society for Optical Engineering.