中国科学院机构知识库网格系统: 检索

An Improved Method for Correcting the Eccentricity Error of Circular Projection in the Binocular Visual System 会议论文 OAI收割
Changzhou, China, September 24-26,. 2021
作者: Xia ZY(夏中原); Zhao JB(赵吉宾); Xia RB(夏仁波)

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收藏 | 浏览/下载：24/0 | 提交时间：2021/12/13

eccentricity error correction binocular visual system distortion error deviation error

Experimental study on location accuracy of a 3D VHF lightning-radiation-source locating network 期刊论文 iSwitch采集
SCIENCE CHINA-EARTH SCIENCES, 2015, 卷号: 58, 期号: 11, 页码: 2034-2048
作者: Zhang GuangShu; Li YaJun; Wang YanHui; Zhang Tong; Wu Bin

收藏 | 浏览/下载：42/0 | 提交时间：2019/10/09

3D lightning-radiation-source locating network location accuracy standard deviation geometric model theoretical error

ERROR ASSESSMENT IN MODELING WITH FRACTAL BROWNIAN MOTIONS 期刊论文 OAI收割
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY, 2013, 卷号: 21, 期号: 3-4
作者: Qiao, Bingqiang; Liu, Siming

收藏 | 浏览/下载：19/0 | 提交时间：2016/09/23

Fractal Brownian Motion Error Assessment Hurst Exponent Standard Deviation Time Series

An appraisal method of dynamic interpolation error for high precision encoder (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
作者: Wan Q.-H.; Liu C.-X.; Liu C.-X.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

This paper introduces an appraisal method of the dynamic interpolation error for the high precision encoder (Lissajou pattern calculation method). When the encoder is rolling two groups of fine photoelectric signals whose phase difference are /2 can be collected using data collected car. The shape and position deviation can be obtained through the comparison between Lissajou charts and the standard circle. Then dynamic interpolation error can be calculated out directly. This method is immune to the influence of encoder's speed and has no rigid demand to the test circumstances and test devices. The experimental results indicate that this method is feasible and important to the encoder's dynamic interpolation error checking. 2011 IEEE.

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：28/0 | 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.

Orientation error analysis of alt-alt photoelectric telescope (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Wu X.-X.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to ascertain the effects of main errors of alt-alt photoelectric telescope on measurement accuracy orientation error is analyzed.For analyzing optical mechanical and electrical errors from measured target to telescope picture we construct 7 coordinates such as:the earth's core coordinate alt-alt coordinate etc. carry through 21 times coordinate transformation form measuring equation with 26 variables. and we utilize Monte Carlo method to calculate the orientation error analyze the effects of errors upon pointing. The result indicates that the measuring error standard deviation of alt-alt telescope is minimum value about 10? at the zenith zone. and the deviation increases with the rotation angles of longitude and latitude axes. The model and the method not only can analyze and synthesize the main errors but also provide a reference to the whole design. 2009 SPIE.

Modeling of satellite borne TDI CCD pitching imaging image motion velocity vector (EI CONFERENCE) 会议论文 OAI收割
2009 IEEE International Conference on Automation and Logistics, ICAL 2009, August 5, 2009 - August 7, 2009, Shenyang, China
作者: Zhang L.; Li S.; Zhang L.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

In order to obtain three-dimensional observation effect with single satellite borne time delay and integrate charge coupled device (TDI-CCD) pitching imaging is required. More accurate real-time image motion velocity vector computational model of space camera is also necessary to make the imaging perfect. Imaging motion velocity vector computation model must be set up on image plane at pitching imaging. According to the geometric relationship between the pitching imaging space camera and the Earth's rotation motion satellite borne TDI CCD pitching imaging motion velocity vector model is derived by mapping the ground speed to the image plane and using coordinate transformation method. The numerical simulation results show that the image velocity model can reduce deviation angle error about 33' and about 30% image motion speed error compared to traditional ground velocity model. 2009 IEEE.

The deviation of color matching algorithm in the field of full-color LED display (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Congress on Image and Signal Processing, CISP'09, October 17, 2009 - October 19, 2009, Tianjin, China
作者: Wang Y.; Chen Y.; Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

In this paper a color gamut transformation method which transformed the different color gamut into a same one has been proposed. In the transforming process the deviation which was arose from the quantization error and the truncation error were existing. If the deviation was out of the color tolerance the uniformity of the screen color will be deteriorated. Firstly the color tolerance of vision was calculated by the color-difference formula. Secondly in the full-color LED display experiments it was analyzed that the tri -color tolerance values are respectively 2.5 2.8 and 1.3. According to the tri -color tolerance values and the color difference formula the express of the quantization precision gray value and the color difference was set up. Finally the gray-scale range of the color uniformity was analyzed by the collected data it was concluded that the uniformity of the display was satisfied the requirement of the visual when the range of the gray level was [11 14] and when the range was [1 11] the value of the color difference was also reduced significantly. 2009 IEEE.

Study and calibration of azimuth effect in multi-position strap-down north seeking system (EI CONFERENCE) 会议论文 OAI收割
7th World Congress on Intelligent Control and Automation, WCICA'08, June 25, 2008 - June 27, 2008, Chongqing, China
作者: Wang Z.; Zhao J.; Wang Z.

收藏 | 浏览/下载：9/0 | 提交时间：2013/03/25

In order to reduce the influence of azimuth effect in multi-position strap-down north seeking system its cause of formation is studied based on the precession principle of the dynamically tuned gyro. A detecting system composed by true north prism two Leica theodolites and benchmark prism fixed in the strap-down north seeking system was designed to calibrate the azimuth effect. By two steps many measurements are gone on in every position to eliminate the random error. According to the homologous between the error and the position a sinusoid is made a fit as compensate curve after the error of twelve positions is measured. Then the azimuth effect of the arbitrary position can be corrected by the curve. The experiment result shows that the seeking north standard deviation is only 11.77 after compensation which is considerably less than the 87.75 without correction. 2008 IEEE.

Study on technology of orientation and north-finding based on fiber optic gyroscope (EI CONFERENCE) 会议论文 OAI收割
2007 IEEE International Conference on Mechatronics and Automation, ICMA 2007, August 5, 2007 - August 8, 2007, Harbin, China
Zhang Z.; Sun J.; Wu K.

收藏 | 浏览/下载：14/0 | 提交时间：2013/03/25

North-finding system provides true north azimuth information to all kinds of ground-based equipment. A dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG) is presented in this paper. In this scheme the sine output signal of the FOG was sampled and disposed and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the platform base tilt was compensated by an accelerator Allan standard deviation is used to analyze the random drift of FOG and establish the random error mode of FOG. The FOG north-finding and laser collimation theodolite are assembled to achieve orientation and aiming integral which lays foundation for switching to project application. 2007 IEEE.