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浏览/检索结果: 共18条，第1-10条 帮助

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中国南海自由生活海洋线虫Sabatieria Rouville,1903的三个新纪录种 CNKI期刊论文  OAI收割
2019
作者:  孙静;  黄冕;  黄勇
  |  收藏  |  浏览/下载：4/0  |  提交时间：2024/12/18
Warm season heavy rainfall events over the Huaihe River Valley and their linkage with wintertime thermal condition of the tropical oceans SCI/SSCI论文  OAI收割
2016
作者:  Li L. F.;  Li, W. H.;  Tang, Q. H.;  Zhang, P. F.;  Liu, Y. M.
  |  收藏  |  浏览/下载：40/0  |  提交时间：2017/11/09
数值积分和数据融合在单位矢量法中的应用 期刊论文  OAI收割
天文学报, 2012, 卷号: 53, 期号: 1, 页码: 94-95
掌静
收藏  |  浏览/下载：25/0  |  提交时间：2013/01/31
大功率TEA CO_2激光器开关电机侧电场干扰测试 期刊论文  OAI收割
光机电信息, 2011, 期号: 01, 页码: 36-38
作者:  孟范江
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/11
Determining factors in potential evapotranspiration changes over China in the period 1971-2008 SCI/SSCI论文  OAI收割
2010
Yin Y. H.; Wu S. H.; Dai E. F.
收藏  |  浏览/下载：47/0  |  提交时间：2012/06/08
Trend in pan evaporation and its attribution over the past 50 years in China SCI/SSCI论文  OAI收割
2010
Liu M.; Shen Y. J.; Zeng Y.; Liu C. M.
收藏  |  浏览/下载：31/0  |  提交时间：2012/06/08
Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination (EI CONFERENCE) 会议论文  OAI收割
Advanced Sensor Systems and Applications III, November 12, 2007 - November 14, 2007, Beijing, China
Lu D.; Guang J.; Shaoju W.; Tao C.
收藏  |  浏览/下载：36/0  |  提交时间：2013/03/25
The paper deals with the spacecraft attitude determination problem using a new kind of star tracker with large FOV based on CMOS APS. Star tracker has been developed since 1970s and proved to be the most accurate sensor ever used in the spacecraft attitude determination systems. But the traditional CCD star tracker also has some disadvantages  such as small FOV  high power consumption  low sample rate and low working angular rate limit which prevent the use of CCD star tracker in attitude large angle maneuvering process. The new kind of star tracker based on CMOS APS has no such disadvantages and is more applicable on modern low-cost agile small satellites. Its higher sample rate and working angular rate limit over traditional CCD star tracker make it more adapt for spacecraft angular velocity determination. Because of the large FOV of the star tracker  the mathematical model of traditional CCD star tracker with a small FOV is not appropriate. So a new mathematical model was quoted to fit the star tracker with a large FOV. An alternative adaptive algorithm was also introduced in the paper. It can help the EKF algorithm work lacking of accurate covariance of the observation noise. An optimal estimation algorithm was used to estimate the angular velocity directly from the star tracker measurements. Mathematic simulation results indicate the CMOS APS star tracker can give accurate attitude information and estimated angular rate. The method can be used as the chief attitude determination system design of low-cost satellite without gyros  or be used as a backup strategy in the event of gyro failures to enhance the reliability of the attitude determination system.  
基于湖库沉积剖面^137Cs变化的流域表层侵蚀速率计算模型 期刊论文  OAI收割
自然科学进展, 2005, 卷号: 15.0, 期号: 004, 页码: 495-498
作者:  贺秀斌;  张信宝;  DEWalling
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/03/01
《国家时间服务技术标准》制定与加入WTO 期刊论文  OAI收割
中国标准化, 2002, 期号: 12, 页码: 45-46
陈洪卿; 郭庆生; 窦忠
收藏  |  浏览/下载：28/0  |  提交时间：2012/07/01
对改善环境的经济动力的探讨 期刊论文  OAI收割
科学学与科学技术管理, 1996, 期号: 02, 页码: 452-459
作者:  李法云,范志平
  |  收藏  |  浏览/下载：16/0  |  提交时间：2011/05/05