中国科学院机构知识库网格
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Effect of elevation on photosynthesis of young mango (Mangifera indica L.) trees 期刊论文  OAI收割
PHOTOSYNTHETICA, 2021, 卷号: 59, 期号: 4, 页码: 508-516
作者:  
Wubshet,T. T.;  Wang,Z.;  Yang,J.;  Chen,H.;  Schaefer,D. A.
  |  收藏  |  浏览/下载:38/0  |  提交时间:2022/04/02
Climatic response of three tree species growing at different elevations in the Luliang Mountains of Northern China 期刊论文  OAI收割
DENDROCHRONOLOGIA, 2013, 卷号: 31, 期号: 4(SI), 页码: 311-317
作者:  
Liu, Y (Liu, Yu)[ 1,2 ];  Cai, QF (Cai, Qiufang)[ 1 ]
  |  收藏  |  浏览/下载:21/0  |  提交时间:2018/12/05
Geocentric distance's errors' correction of space cameras based on USGS DEM (EI CONFERENCE) 会议论文  OAI收割
2011 IEEE 3rd International Conference on Communication Software and Networks, ICCSN 2011, May 27, 2011 - May 29, 2011, Xi'an, China
作者:  
Li W.;  Li W.;  Xu S.
收藏  |  浏览/下载:25/0  |  提交时间:2013/03/25
In order to correct the geocentric distance's error of TDI (Time Delay and Integration) CCD space camera in calculation of image motion compensation  the data source of the earth's height above sea level USGS DEM (United States Geological Survey Digital Elevation Model) has been introduced to make digital elevation map  the match error of the forward direction (the integral direction of TDI CCD) has been greatly decreased by correcting the geocentric distance error  and eliminate the influence to the relative error of image motion velocity  and correct the error generated by the different heights above sea level. After correcting  which greatly improves the imaging quality of TDI CCD space camera. 2011 IEEE.  a model of image motion calculation of nadir has been introduced  the calculation and analysis of the model shows that: the maximum error of image motion velocity about 1.72% has been decreased to 0.06%  and the influence of the geocentric distance error to the relative error of image motion velocity has been analyzed with the model  
Non-linear compensation algorithm of LOS locating in aerial remote sensor (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2011, August 12, 2011 - August 14, 2011, Harbin, China
作者:  
Li J.;  Li Y.;  Li Y.;  Li Y.;  Li Y.
收藏  |  浏览/下载:33/0  |  提交时间:2013/03/25
A non-linear light-of-sight(LOS) locating compensation algorithm for certain aerial remote sensor is presented in this paper. The LOS locating system is composed of two main components  which are an inertial reference frame to provide coarse LOS locating and a 2-axis Fast Steering Mirror to remove the frame's residual error. The azimuth and elevation of LOS are both affected by the FSM two-degree-of-freedom rotation  which should be dealt with to raise the accuracy of LOS location. This paper extrapolates LOS locating algorithm of FSM by coordinate transformation  and gives corresponding deviation analysis for different LOS poiting angles. It is found that the angle deviation grows rapidly with range of FSM's travel enlarging  so the deviation must be eliminated. Through the data analysis for deviation  a non-linear compensation algorithm is proved effective to reduce the error of LOS significantly. Taking LOS changing in [-3 deg  3 deg] as an example  two analytic expressions are given  and the LOS locating accuracy rises by 34 times compared with non-linear compensation unused  and the cross coupling of LOS loating is 0.08%. 2011 IEEE.