中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
机构
采集方式
内容类型
发表日期
学科主题
筛选

浏览/检索结果: 共11条，第1-10条 帮助

条数/页： 排序方式：
Two-stage frequency compensation for Doppler shift on BPSK transceiver with LDPC codes for free-space optical communication systems 期刊论文  OAI收割
FRONTIERS IN PHYSICS, 2023, 卷号: 11
作者:  
  |  收藏  |  浏览/下载：32/0  |  提交时间：2023/04/07
Performance of Multi-GNSS Precise Point Positioning Time and Frequency Transfer with Clock Modeling 期刊论文  OAI收割
REMOTE SENSING, 2019, 卷号: 11, 期号: 3, 页码: 21
作者:  Ge, Yulong;  Dai, Peipei;  Qin, Weijin;  Yang, Xuhai;  Zhou, Feng
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/11/29
Enhancing real-time precise point positioning time and frequency transfer with receiver clock modeling 期刊论文  OAI收割
GPS SOLUTIONS, 2019, 卷号: 23, 期号: 1, 页码: 14
作者:  Ge, Yulong;  Zhou, Feng;  Liu, Tianjun;  Qin, WeiJin;  Wang, Shengli
  |  收藏  |  浏览/下载：18/0  |  提交时间：2021/11/29
Review of the key techniques on short-offset electromagnetic detection 期刊论文  OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2018, 卷号: 61, 期号: 1, 页码: 1-8
作者:  He JiShan;  Xue GuoQiang
  |  收藏  |  浏览/下载：36/0  |  提交时间：2018/09/26
Review of the key techniques on short-offset electromagnetic detection 期刊论文  OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2018, 卷号: 61, 期号: 1, 页码: 1-8
作者:  He JiShan;  Xue GuoQiang
  |  收藏  |  浏览/下载：26/0  |  提交时间：2018/09/26
A DIRECT EVALUATION OF MONO-COMPONENTS BY INSTANTANEOUS FREQUENCY 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF WAVELETS MULTIRESOLUTION AND INFORMATION PROCESSING, 2012, 卷号: 10, 期号: 3
作者:  Niu, Kaifu;  Peng, Lizhong;  Peng, Silong
收藏  |  浏览/下载：30/0  |  提交时间：2015/08/12
Image mosaic technique based on the information of edge (EI CONFERENCE) 会议论文  OAI收割
2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012, July 31, 2012 - August 2, 2012, Guilin, Guangxi, China
作者:  Wang Y.-Q.
收藏  |  浏览/下载：34/0  |  提交时间：2013/03/25
Image mosaic is an important branch in the field of image processing. This paper designs and realizes an image mosaic technique based on the information of edge. The technology is suitable for engineering application. First of all  two images of the adjoining frames are processed by convolution operation  get the edge images. And then we cut edge image into pieces and compute their spatial frequency. According to the value of the spatial frequency select reasonable registration model group. We compute correlation strength and the value of movement offset which are the model group and the current frame edge image. We can complete image mosaic by them. We use video sequence which of the resolution is 1024 * 768 do the experiment. The results show that the method has good effect and strong adaptability. Algorithm is high efficiency which running time is 24 ms. It is suitable for real-time processing requirements of the application. This method is an effective mosaic technique which is suitable for engineering application. 2012 IEEE.  
Chip design of linear CCD drive pulse generator and control interface (EI CONFERENCE) 会议论文  OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies - Advanced Optical Manufacturing and Testing Technologies, November 2, 2005 - November 5, 2005, Xian, China
作者:  Sun H.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25
CCD noises and their causes are analyzed. Methods to control these noises  such as Correlated Double Sampling (CDS)  filtering  cooling  clamping  and calibration are proposed. To improve CCD sensor's performances  the IC  called Analog Front End (AFE)  integration of CDS  clamping  Programmable Gain Amplifier (PGA)  offset  and ADC  which can fulfill the CDS and analog-to-digital conversion  is employed to process the output signal of CCD. Based on the noise control approaches  the idea of chip design of linear CCD drive pulse generator and control interface is introduced. The chip designed is playing the role of (1) drive pulse generator  for both CCD and AFE  and (2) interface  helping to analysis and transfer control command and status information between MCU controller and drive pulse generator  or between global control unit in the chip and CCD/AFE. There are 6 function blocks in the chip designed  such as clock generator for CCD and AFE  MCU interface  AFE serial interface  output interface  CCD antiblooming parameter register and global control logic unit. These functions are implemented in a CPLD chip  Xilinx XC2C256-6-VQ100  with 20MHz pixel frequency  and 16-bit high resolution. This chip with the AFE can eliminate CCD noise largely and improve the SNR of CCD camera. At last  the design result is presented.  
Study of removing striping noise in CCD image (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  Liu H.;  Liu H.;  Liu H.
收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25
Striping noise is the common system noise during formation of image using linear array CCD and has the character of periodicity  directivity and banding distributing. It can be caused by errors in internal calibration devices  or by slight gain/offset differences among the elements that conform the array of detectors. Striping noise covers up useful information in CCD image and brings adverse effect to image interpretation. On the basis of analyzing wavelet decomposed coefficient  the regularities of distribution about striping noise in wavelet coefficient is found  thereby the method of wavelet threshold selection which is suitable to striping noise distribution is put forward. According to Donoho's method about denoising using wavelet  the image including striping noise is processed. Comparing the power spectrum of processed image with the one of original image polluted by striping noise in frequency field  we find pulse brought by striping noise is removed and the goal which reserves image details and reduces stripes is achieved.  
A new algorithm for the frequency offset in Doppler data 期刊论文  OAI收割
CHINESE ASTRONOMY AND ASTROPHYSICS, 2001, 卷号: 25, 期号: 2, 页码: 259-265
作者:  Jia, PZ;  Wu, LD
收藏  |  浏览/下载：20/0  |  提交时间：2013/01/31