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浏览/检索结果: 共16条，第1-10条 帮助

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COVID-19 and risk spillovers of China?s major financial markets: Evidence from time-varying variance decomposition and wavelet coherence analysis 期刊论文  OAI收割
FINANCE RESEARCH LETTERS, 2023, 卷号: 52, 页码: 9
作者:  Xie, Qiwei;  Cheng, Lu;  Liu, Ranran;  Zheng, Xiaolong;  Li, Jingyu
  |  收藏  |  浏览/下载：39/0  |  提交时间：2023/02/22
Applications of differential barometric altimeter in ground cellular communication positioning network 期刊论文  OAI收割
IET SCIENCE MEASUREMENT & TECHNOLOGY, 2020, 卷号: 14, 期号: 3, 页码: 322-331
作者:  Hu, Zhengqun;  Zhang, Lirong;  Ji, Yuanfa
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/12/06
cellular radio  height measurement  measurement errors  Global Positioning System  altimeters  barometers  least squares approximations  Kalman filters  surface fitting  spread spectrum communication  compensation  matrix algebra  GPS  signal message structure  power spectrum  spread spectrum ranging signal  fitting parameters  least-square solution  calibration compensation  system noise variance matrix  measurement noise variance matrix  multibase station correction  height information correction calculation  DBA system  systematic performance  differential barometric altimeter  ground cellular communication positioning network  measurement datum distribution  altitude positioning error  Global Positioning System  differential barometric altimetry system  systematic implementation level  continuous altitude measurement  precise altitude measurement  DBA systematic implementation aspect  two dimensional curved surface fitting function  sensor measurement correction  filtering effect  Kalman filter  measuring station  multiBSs  navigation fusion  
Using Allan Variance Based Semi-Parameter Model to Calibrate Pointing Errors of Alt-az Telescopes 期刊论文  OAI收割
APPLIED SCIENCES-BASEL, 2018, 卷号: 8, 期号: 4, 页码: 614
作者:  Lingjie Yan;  Yongmei Huang;  Yahui Zhang
  |  收藏  |  浏览/下载：34/0  |  提交时间：2019/08/23
Assessment of pollutant mean concentrations in the Yangtze estuary based on MSN theory 期刊论文  OAI收割
MARINE POLLUTION BULLETIN, 2016, 卷号: 113, 期号: 1-2, 页码: 216-223
作者:  Ren, Jing;  Gao, Bing-Bo;  Fan, Hai-Mei;  Zhang, Zhi-Hong;  Zhang, Yao
  |  收藏  |  浏览/下载：75/0  |  提交时间：2019/09/26
Assessment of pollutant mean concentrations in the Yangtze estuary based on MSN theory 期刊论文  OAI收割
MARINE POLLUTION BULLETIN, 2016, 卷号: 113, 期号: 1-2, 页码: 216-223
作者:  Ren, Jing;  Gao, Bing-Bo;  Fan, Hai-Mei;  Zhang, Zhi-Hong;  Zhang, Yao
  |  收藏  |  浏览/下载：24/0  |  提交时间：2019/09/26
Assessment of pollutant mean concentrations in the Yangtze estuary based on MSN theory 期刊论文  OAI收割
MARINE POLLUTION BULLETIN, 2016, 卷号: 113, 期号: 1-2, 页码: 216-223
作者:  Ren, Jing;  Gao, Bing-Bo;  Fan, Hai-Mei;  Zhang, Zhi-Hong;  Zhang, Yao
  |  收藏  |  浏览/下载：21/0  |  提交时间：2019/09/26
Testing inequality constraints in a linear regression model with spherically symmetric disturbances 期刊论文  OAI收割
JOURNAL OF SYSTEMS SCIENCE & COMPLEXITY, 2014, 卷号: 27, 期号: 6, 页码: 1204-1212
作者:  Zhu Rong;  Zhou Sherry Z F
  |  收藏  |  浏览/下载：14/0  |  提交时间：2021/01/14
Analysis on the influence of random vibration on MEMS gyro precision and error compensation (EI CONFERENCE) 会议论文  OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
作者:  Li M.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
In order to improve its precision in dynamic environment  a Kalman filter was designed. Firstly  two sets of random drift data of MEMS gyro were respectively analysed  and it was found that the variance of random drift under random vibration significantly increased and its mean also changed. Then calculation results show that attitude angle error under random vibration is 2.6  while in the static test it is 0.25. Analysis on the characteristics of random drift was carried out  and it is found that it can be treated as stable  normally distributed random signal. Finally  a corresponding Kalman filter was designed. The results indicated that after filtering the variance of random drift is reduced to 0.0282  26.4% of pre-filtering and the attitude angle error is reduced to 1.5  57.7% of pre-filtering. The above method can effectively compensate for the attitude angle error of MEMS gyro caused by random vibration. This study can be a reference to the application of low-cost MEMS gyro in aircraft navigation. (2012) Trans Tech Publications  Switzerland.  
Estimating the error variance after a pre-test for an interval restriction on the coefficients 期刊论文  OAI收割
COMPUTATIONAL STATISTICS & DATA ANALYSIS, 2011, 卷号: 55, 期号: 7, 页码: 2312-2323
作者:  Zhu, Rong;  Zhou, Sherry Z. F.
  |  收藏  |  浏览/下载：18/0  |  提交时间：2018/07/30
Phase error estimation with broadband white light by Phase Diversity (EI CONFERENCE) 会议论文  OAI收割
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
作者:  Wang Z.;  Wang B.;  Zhang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25
The technique of Phase Diversity (PD) is widely adopted to measure the wavefront error caused by atmosphere turbulence and system error. PD solves the Zernike coefficients of the wavefront by utilizing two images obtained with different defocus value. In this paper  we propose a method to restore the image and estimate the wavefront error of an imaging system. And we use present white noises to verify the robustness of the algorithm. We design an experiment system and implement it in our laboratory. The proposed algorithm is validated by computer simulations and experimental results. To use a broadband white object in experimental system a reasonable simplification for the system model is done. Our results show that the robustness against Gaussian white noises of the method is better then the case when the variance value is 0.03. The proposed method can be used as a wavefront sensor and restore the degradative images by photoelectric image system. 2010 SPIE.