中国科学院机构知识库网格系统: 检索

Network Characteristics and Vulnerability Analysis of Chinese Railway Network under Earthquake Disasters 期刊论文 OAI收割
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 2020, 卷号: 9, 期号: 12, 页码: 19
作者: Yin, Lingzhi; Wang, Yafei

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收藏 | 浏览/下载：26/0 | 提交时间：2021/03/15

Chinese railway network complex network linear reference earthquake disasters vulnerability analysis

Network Characteristics and Vulnerability Analysis of Chinese Railway Network under Earthquake Disasters 期刊论文 OAI收割
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION, 2020, 卷号: 9, 期号: 12, 页码: 19
作者: Yin, Lingzhi; Wang, Yafei

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收藏 | 浏览/下载：14/0 | 提交时间：2021/03/15

Chinese railway network complex network linear reference earthquake disasters vulnerability analysis

AN ACTIVE FAULT-TOLERANT CONTROL FRAMEWORK AGAINST ACTUATOR STUCK FAILURES UNDER INPUT SATURATIONS 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF APPLIED MATHEMATICS AND COMPUTER SCIENCE, 2017, 卷号: 27, 期号: 4, 页码: 749-761
作者: He YQ(何玉庆); Qi X(齐欣); Theilliol, Didier; Han JD(韩建达)

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收藏 | 浏览/下载：43/0 | 提交时间：2018/01/25

fault-tolerant control (FTC) actuator stuck failure actuator constraints reference redesign linear matrix inequality (LMI)

Reference selection for hybrid TOA/RSS linear least squares localization 会议论文 OAI收割
2013 IEEE 78th Vehicular Technology Conference, VTC Fall 2013, Las Vegas, NV, United states, September 2, 2013 - September 5, 2013
作者: Wang, Yue; Zheng, Feng; Wiemeler, Michael; Xiong, Weiming; Kaiser, Thomas

收藏 | 浏览/下载：75/0 | 提交时间：2014/04/30

hybrid localization received-signal-strength (RSS) reference selection time-of-arrival (TOA) ultra-wideband (UWB) weighted linear least squares (WLLS)

Non-linear compensation algorithm of LOS locating in aerial remote sensor (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
作者: Li J.; Li Y.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

A non-linear light-of-sight(LOS) locating compensation algorithm for certain aerial remote sensor is presented in this paper. The LOS locating system is composed of two main components which are an inertial reference frame to provide coarse LOS locating and a 2-axis Fast Steering Mirror to remove the frame's residual error. The azimuth and elevation of LOS are both affected by the FSM two-degree-of-freedom rotation which should be dealt with to raise the accuracy of LOS location. This paper extrapolates LOS locating algorithm of FSM by coordinate transformation and gives corresponding deviation analysis for different LOS poiting angles. It is found that the angle deviation grows rapidly with range of FSM's travel enlarging so the deviation must be eliminated. Through the data analysis for deviation a non-linear compensation algorithm is proved effective to reduce the error of LOS significantly. Taking LOS changing in [-3 deg 3 deg] as an example two analytic expressions are given and the LOS locating accuracy rises by 34 times compared with non-linear compensation unused and the cross coupling of LOS loating is 0.08%. 2011 IEEE.

Recommendations for construction of a nonlinear international Terrestrial Reference Frame 期刊论文 OAI收割
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2011, 卷号: 54, 期号: 1, 页码: 164-171
作者: Zhu WenYao; Song ShuLi; He LiNa

收藏 | 浏览/下载：31/0 | 提交时间：2015/08/19

International Terrestrial Reference Frame geocenter motion scale linear to nonlinear definition of ITRF station coordinates the coordinate transformation expression

Method of improving the accuracy of image motion measurement for panoramic aerial cameras (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, April 26, 2010 - April 29, 2010, Dalian, China
作者: Jia P.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

To improve the accuracy of image motion measurement for panoramic aerial cameras the paper proposed a method of real-time image motion measurement based on 2D spatial correlation. An auxiliary area CCD is positioned paralleled to the main linear TDI CCD in the focal plane of the camera. For every frame of the image sequence taken by the auxiliary CCD a prediction on the displacement of the current image in the flight direction is made based on the forward image motion velocity. The current and the reference images are combined together for 2D-correlation which products an image motion vector. By decomposing the vector both the forward and pendulum-swing image motions can be determined. The demanding computational requirements for the real-time 2D-correlation are covered by a joint transform optical correlator. Simulation test results show that the accuracy is improved and the measurement error is within 0.2 pixels for input images with SNR=1 dB. 2010 Copyright SPIE - The International Society for Optical Engineering.

Research on the laboratory radiometric calibration of the thermal imager (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: Wang J.; Liu Y.; Liu Y.; Liu Y.; Sun Q.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

The radiometric calibration of the thermal imager was investigated to build the relationship between the input radiance and the digital output to realize the temperature measurement. The radiometric calibration was implemented in the State Key Laboratory of Applied Optics. A standard black body source was served as radiation source. The response of the thermal imager to the input radiance was tested for different gains. The experimental results show that the average grey level of the output imaging is linear dependence of the input radiance. Because the radiance in the receiving wave range of the thermal imager is linear with the black body's temperature based on Planck's law of radiation the average grey level of the output image is also linear with the black body's temperature after fitting a curve to the experiment data points. Then the relationship of the response and the gain was studied when the black body's temperature kept constant. The preliminary analysis of calibration data shows that the response of the thermal imager is linear and the average grey value of the image is directly proportion to the gain. According to the experimental results the reference gains and the dynamic range of temperature measurement were obtained. Finally the uncertainty influencing the calibration results was analyzed the analysis shows the maximal uncertainty is 5.2% which can meet the calibration requirement less than 10%. 2010 Copyright SPIE - The International Society for Optical Engineering.

Non-uniformity correction in multi-CCD imaging system (EI CONFERENCE) 会议论文 OAI收割
2010 2nd International Conference on Mechanical and Electronics Engineering, ICMEE 2010, August 1, 2010 - August 3, 2010, Kyoto, Japan
Tao M.; Ren J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

The non-uniformity phenomenon exists in each channel of multi-CCD imaging systems. The factors which lead to the problem are complex. The conventional calibrating algorithms can not consider all of these factors and have poor effects. According to the characters of multi-CCD imaging systems a non-uniformity correction method based on the scene was proposed by adopting the traditional two-point correction theories. The correction coefficient of each channel image can be calculated via the linear relation between the two neighboring pixel lines in the two-channel images. Compared with the conventional two-point calibration and multi-point calibration methods contrastive calibrating results were obtained. This method does not need any standard lighted image as reference source which provides a real time way for calibrating the multi-CCD imaging systems in practical applications. 2010 IEEE.

Nonlinear control design for system with mechanical resonance based on two tracking-differentiators (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010, August 4, 2010 - August 7, 2010, Xi'an, China
作者: Li J.; Li Y.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

A nonlinear control strategy for controlling a motion system with mechanical resonance is presented in this paper. A mathematical model of the servo system is derived according to the parameters of an actual system. By using two Tracking-Differentiators reference input and system output are tracked and their differential signals are given simultaneously. A nonlinear PD control law in velocity loop is designed based on non-smooth feedback. The simulation results show that the control law is superior remarkably in performance to linear PD control law and the classical PID control law. Tracking-Differentiator resolves the contradiction between rapidity and overshoot of system response. The nonlinear PD control law improves system dynamic performance and intensifies the ability of disturbance rejection. The control design achieved in this paper makes the servo system more robust. 2010 IEEE.