QQ客服 官方微博 反馈留言

浏览/检索结果: 共7条，第1-7条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 Resolving Horizontal Rupture Directivity of Moderate Crustal Earthquake in Sparse Network With Ambient Noise Location 期刊论文 JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2018, 卷号: 123, 期号: 1, 页码: 533-552 作者:  He, X.;  Ni, S. 收藏  |  浏览/下载：19/0  |  提交时间：2018/12/29 rupture directivity  ambient noise  centroid location  sparse network   Distributed Parallel Super-Block-Based Star Detection and Centroid Calculation 会议论文 IEEE SENSORS JOURNAL, 2018-10-01 作者:  Wang, Zhen;  Jiang, Jie;  Zhang, Guangjun 收藏  |  浏览/下载：7/0  |  提交时间：2019/12/30 Distributed parallel  star detection  centroid location  star tracker  distributed shared memory  image sensors application   Distributed Parallel Super-Block-Based Star Detection and Centroid Calculation 期刊论文 IEEE SENSORS JOURNAL, 2018, 卷号: 18, 页码: 8096-8107 作者:  Wang, Zhen;  Jiang, Jie;  Zhang, Guangjun 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/30 Distributed parallel  star detection  centroid location  star tracker  distributed shared memory  image sensors application   Centroid localization algorithm based on bicubic interpolation gray square weighted (EI CONFERENCE) 会议论文 2012 3rd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2012, December 22, 2012 - December 23, 2012, Beihai, China Zhou J.; Chen X.-L.; Li S.-J.; Huang D.-Y.; Ma G.-Z. 收藏  |  浏览/下载：143/0  |  提交时间：2013/03/25 The 3D coordinates of measured point is embodied in 2D image coordinate of the optical characteristic point via the visual measurement system. Based on the gray square weighted centroid localization algorithm  the paper presents bicubic interpolation gray square weighted centroid localization algorithm  increases the number of effective pixels around the optical characteristic point imaging center  and reduces noise error via the gray square weighted  improves the imaging center location accuracy of optical characteristic point  realizes the accurate location of the optical characteristic points. Results indicate application of the proposed algorithm to location  the standard tolerance along the direction of x is 0.0022 Pixel  the standard tolerance along the direction of y is 0.0023 Pixel  compared with the others  the standard tolerance is minimum and discrete to a lesser degree distancing ideal image point  that is  the proposed algorithm has higher location accuracy. The maximum tolerance along the direction of x is 0.008 Pixel  the one along the direction of y is 0.007 Pixel  compared with the other two algorithms  the maximum tolerance is minimum.Results indicate that the stability of the proposed algorithm is better. (2013) Trans Tech Publications  Switzerland.   ZigBee indoor positioning system precision parameter study based on BP neural network 会议论文 International Conference on Computer, Networks and Communication Engineering (ICCNCE), Beijing, PEOPLES R CHINA, MAY 23-24, 2013 Zeng Wenxiao; Wang Yanen; Wang Meng; Guo Ye 收藏  |  浏览/下载：19/0  |  提交时间：2014/11/10 CC2431  Zigbee location  BP Neural Network  Euclidian distance centroid algorithm  multi-target detection indoor   An improved weighted centroid location algorithm 期刊论文 Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University, 2010, 卷号: 44, 期号: [db:dc_citation_issue], 页码: 1-4 作者:  Yang, Xinyu;  Kong, Qingru;  Dai, Xiangjun 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/10 Anchor nodes  Centroid  Location algorithms  Location precision  Real systems  Received signal strength indication  Signal strengths  Weighted centroid   Active pixel sensor geometrical characteristic effects on star image subdivided locating accuracy for star tracker (EI CONFERENCE) 会议论文 ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China Li J.; Liu J.; Hao Z. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 Active pixel sensor (APS) star tracker becomes an investigated hotspot because of its technical advantages. And centroid algorithm is a subpixel method proper to star position calculation because of its high accuracy and simplicity. When centroid algorithm is applied on APS star tracker  APS pixel geometrical characteristics might effect on star image position accuracy. Because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area  the Fill Factor is less than 100%. Moreover  the active sensitive area has a certain geometrical shape  such as square  rectangle and L shape. The Fill Factor of pixel influences on star image subdivided locating accuracy when using centioid algorithm. In this paper  we have analyzed all pixel geometrical characteristics influence on the star position accuracy. From simulation experiments  we can conclude that Fill factor and pixel geometric shape influence on star position accuracy. The star locating error increased when Fill Factor decreased  and different geometrical shape of active sensitive area of pixel can make different influence on star location accuracy  the symmetrical sensitive area in x or y axis have symmetrical location error in the same axis.