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自然资源要素综合观测指标体系探讨 期刊论文  OAI收割
资源科学, 2020, 卷号: 42, 期号: 10, 页码: 1883
作者:  张贺;  王绍强;  王梁;  程书波;  姜正龙
  |  收藏  |  浏览/下载：11/0  |  提交时间：2021/03/15
Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT 期刊论文  OAI收割
Astrophysics and Space Science, 2020, 卷号: 365, 页码: 158
作者:  HXMT
  |  收藏  |  浏览/下载：48/0  |  提交时间：2022/02/08
Insight-HXMT  Geant4 simulation  Background observation  Astrophysics  - Instrumentation and Methods for Astrophysics  Abstract: Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreements are shown for all three telescopes. For HE, (1) the deviation of the simulated background rate after two years of operation in space is 5 % from the observation  (2) the total background spectrum and the relative abundance of the 67 keV line show long-term increases both in simulations and observations. For ME, (1) the deviation of simulated background rate is within 15 % from the observation, and (2) there are no obvious long-term increase features in the background spectra of simulations and observations. For LE, the background level given by simulations is also consistent with observations. The consistencies of these comparisons validate that the Insight-HXMT mass model, i.e., space environment components and models adopted, physics processes selected, and detector constructions built, is reasonable. However, the line features at 7.5 and 8.0 keV, which are obvious in the observed spectra of LE, are not evident in simulations. This might result from uncertainties in the LE constructions.  
In-orbit Demonstration of X-Ray Pulsar Navigation with the Insight-HXMT Satellite 期刊论文  OAI收割
The Astrophysical Journal Supplement Series, 2019, 卷号: 244, 页码: 1
作者:  HXMT
  |  收藏  |  浏览/下载：13/0  |  提交时间：2022/02/08
pulsars: general  techniques: miscellaneous  Astrophysics -  Instrumentation and Methods for Astrophysics  Abstract: In this work, we report the in-orbit demonstration of X-ray pulsar navigation with Insight-Hard X-ray Modulation Telescope (Insight-HXMT) Satellite, which was launched on 2017 June 15. The new pulsar navigation method Significance Enhancement of Pulse-profile with Orbit-dynamics is adopted to determine the orbit with observations of only one pulsar. In this test, the Crab pulsar is chosen and observed by Insight-HXMT from 2017 August 31 to September 5. Using the five-day long observation data, the orbit of Insight-HXMT is determined successfully with the three telescopes onboard: High Energy X-ray Telescope, Medium Energy X-ray Telescope, and Low Energy X-ray Telescope, respectively. By combining all the data, the position and velocity of the Insight-HXMT are pinpointed to within 10 km (3ҩ and 10 m s-1 (3ҩ, respectively.  
Automatic Solar Seeing Observations at Mt. Wumingshan in Western China 期刊论文  OAI收割
SOLAR PHYSICS, 2018, 卷号: 293, 期号: 2
作者:  Song TF(宋腾飞);  Wen, Y. M.;  Liu Y(刘煜);  Elmhamdi, A.;  Kordi, A. S.
  |  收藏  |  浏览/下载：61/0  |  提交时间：2018/04/03
Gnomon shadow lengths recorded in the Zhoubi Suanjing: the earliest meridian observations in China? 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2009, 卷号: 9, 期号: 12, 页码: 1377-1386
作者:  Li, Yong;  Sun, Xiao-Chun
收藏  |  浏览/下载：21/0  |  提交时间：2017/04/27
Gnomon shadow lengths recorded in the Zhoubi Suanjing: the earliest meridian observations in China? 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2009, 卷号: 9, 期号: 12, 页码: 1377-1386
作者:  Li, Yong;  Sun, Xiao-Chun
  |  收藏  |  浏览/下载：19/0  |  提交时间：2022/07/01
Design of GPS/INS integrated navigation system based on multisensor information fusion (EI CONFERENCE) 会议论文  OAI收割
6th World Congress on Intelligent Control and Automation, WCICA 2006, June 21, 2006 - June 23, 2006, Dalian, China
Chunmei H.; Yantao T.; Wanxin S.; Mao L.
收藏  |  浏览/下载：37/0  |  提交时间：2013/03/25
Two kinds of design methods of GPS/INS integrated navigation system are presented  that is GPS/INS integrative system and integrated navigation system based on information fusion. By analyzing mathematics model of the first system error  we found that inertia velocity error would cause code loop track error. Consequently  the pseudo range meterage error is interrelated with inertia velocity error  which is complex to calculate. If this relativity is ignored in the state equation and observation equation of this system  it must affect the estimated precision of the kalman filter and maybe the system is unstable. Therefore  the second integrated navigation method is introduced. It adopts information fusion  federal kalman filter and covariance. And consider the above pertinence to analyze the navigation performance of the integration system. Then it gives the flow of federal kalman filter algorithm. By analyzing  the conclusion is that velocity error of integrated navigation system drops from 0.5m/s to below 0.05m/s  and improves the precision and reliability of the navigation system effectively  well continuity and real-time capability. It provides an effective way for data analysis and process of fusion navigation system. 2006 IEEE.  
A test of some luminosity functions of quasars 期刊论文  OAI收割
ASTRONOMY & ASTROPHYSICS, 1998, 卷号: 339, 期号: 1, 页码: 15-18
作者:  Tan YP(覃一平);  Xie GZ(谢光中);  Zheng, XT
收藏  |  浏览/下载：18/0  |  提交时间：2016/04/12