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浏览/检索结果: 共12条，第1-10条 帮助

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Normalized point source sensitivity analysis of large sparse telescopes 期刊论文  OAI收割
Chinese Optics, 2019, 卷号: 12, 期号: 3, 页码: 567-574
作者:  Q.-C.An;  J.-X.Zhang;  F.Yang;  H.-C.Zhao;  H.-F.Cao
  |  收藏  |  浏览/下载：36/0  |  提交时间：2020/08/24
Ritchey-Common sparse-aperture testing of the Giant Steerable Science Mirror 期刊论文  OAI收割
Applied Optics, 2018, 卷号: 57, 期号: 27, 页码: 7764-7769
作者:  An, Q. C.;  Zhang, J. X.;  Yang, F.;  Zhao, H. C.;  Cao, H. F.
  |  收藏  |  浏览/下载：15/0  |  提交时间：2019/09/17
Accuracy synthesis of a 3-RPS parallel robot based on manufacturing costs (EI CONFERENCE) 会议论文  OAI收割
31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China
Yao T.-K.; Xi Z.; Feng Z.; Zhang L.-M.; Yong W.
收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25
Pose accuracy is an important issue for parallel robot being used as mirror supporting system of telescope. One challenging topic is the accuracy synthesis which deals with the optimal design of the manufacturing and assembling tolerances of each component under the given pose accuracy. First  the error model of the 3-RPS parallel robot is built based on total derivation of the kinematic equations. And the error variable of each spherical or rotate joint can be expressed as a single boundary error parameter but not three independent position parameters. Then  the accuracy synthesis model is formulated taking the manufacturing costs as the optimization objective and the accuracy requirements as the constraint condition. Finally  the genetic algorithm is used to solve the optimization problem and a simulation example is given. The results show that the accuracy synthesis method based on manufacturing costs can satisfy the need of pose accuracy and is better for engineering application than the method based on error sensitivity. 2012 Chinese Assoc of Automati.  
Uncertainty analysis of modeled carbon fluxes for a broad-leaved Korean pine mixed forest using a process-based ecosystem model SCI/SSCI论文  OAI收割
2012
作者:  Zhang L.;  Zhang L.
收藏  |  浏览/下载：41/0  |  提交时间：2012/09/04
The Research of real time auto-recognition of the moire fringe (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.; Wu Z.-G.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity  high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black  the angle of the stripes is uniform  the width of the stripes is uniform  the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE)  the closer a series of data is  the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin  180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those  then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe  60 equal angles are divided in the neighborhood of the angle  then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe  we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn  and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise  an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe  and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest  the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method  the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method  and it can achieve with 15 ms  that satisfying the demand of real time. 2011 SPIE.  
Centroid error analysis of Shack-Hartmann wave-front sensor induced by the sensitivity non-uniformity 期刊论文  OAI收割
JOURNAL OF MODERN OPTICS, 2008, 卷号: 55, 期号: 11, 页码: 1739-1748
作者:  Li, Huaqiang;  Song, Helun;  Rao, Xuejun;  Rao, Changhui
收藏  |  浏览/下载：24/0  |  提交时间：2015/09/21
Measurement of a reciprocal four-port transmission line structure using the 16-term error model 期刊论文  iSwitch采集
Microwave and optical technology letters, 2007, 卷号: 49, 期号: 7, 页码: 1511-1515
作者:  
收藏  |  浏览/下载：30/0  |  提交时间：2019/05/12
a perceptual sensitivity based redundant slices coding scheme for error-resilient transmission h.264/avc video 会议论文  OAI收割
4th International Conference on Communications, Circuits and Systems (ICCCAS 2006), Guilin, PEOPLES R CHINA, JUN 25-28,
Xu Jin; Wu Zhimei
  |  收藏  |  浏览/下载：26/0  |  提交时间：2011/07/28
a perceptual sensitivity based redundant slices coding scheme for error-resilient transmission h.264/avc video 会议论文  OAI收割
4th International Conference on Communications, Circuits and Systems (ICCCAS 2006), Guilin, PEOPLES R CHINA, JUN 25-28,
Xu Jin; Wu Zhimei
  |  收藏  |  浏览/下载：15/0  |  提交时间：2011/07/28
An integrated algorithm for estimating regional latent heat flux and daily evapotranspiration EI期刊论文  OAI收割
2006
作者:  Liu C.;  Yu Q.
收藏  |  浏览/下载：21/0  |  提交时间：2012/06/11