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The In-Flight Realtime Trigger and Localization Software of GECAM

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Research in Astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： Xiao-Yun Zhao Shao-lin Xiong Xiang-Yang Wen Xin-Qiao li Ce Cai Shuo Xiao Qi Luo Wen-Xi Peng Dong-Ya Guo Zheng-Hua An {2. Gong Jin-Yuan liao Yan-Qiu Zhang Yue Huang Lu li Xing Wen Fei Zhang Jing Duan Chen-Wei Wang Dong-li Shi Peng Zhang Qi-Bin Yi Chao-Yang li Yan-Bing Xu Xiao-Hua liang Ya-Qing liu Da-li Zhang Xi-Lei Sun Fan Zhang Gang Chen Huan-Yu Wang Sheng Yang Xiao-Jing liu Min Gao Mao-Shun li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong liu Xing-Bo Han Jin-ling Qi Jia Huang {2.-{2. Zhang Can Chen Xiong-Tao Yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang Ma Xiao-Bo li Ping Wang Xin-Ying Song li-Ming Song Shi-Jie Zheng Bing li Hong-Mei Zhang Yue Zhu Wei Chen Jian-Jian He Zhen Zhang Jin Hou Hong-jun Wang Yan-Chao Hao Xiang-Yu Wang Zong-Yuan Yang Zhi-Long Wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan Yan-Guo li Gang li Xu-Fang li Fang-jun Lu Hong Lu Bin Meng Feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei Yang Xue-Juan Yang Shuang-Nan Zhang Chao-Yue Zhang Cheng-Mo Zhang Zhi-Cheng Tang Cheng Cheng key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of chinese Academy of sciences Chinese Academy of SciencesBeijing 100049China School of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and Space Science College China West Normal UniversityNanchong 637002China Department of Astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun University of Science and Technology Changchun 130022China chinese Academy of sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2.2. December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

A GRB Follow-up System at the Xinglong observatory and Detection of the High-Redshift GRB 06092.

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chinese Journal of Astronomy and Astrophysics 2008年第6期8卷 693-699页

作者： Wei-Kang Zheng Jin-Song Deng Meng Zhai li-Ping Xin Yu-Lei Qiu Jing Wang Xiao-Meng Lu Jian-Yan Wei Jing-Yao Hu national astronomical {2. Chinese Academy of Sciences Beijing 100012 China Graduate School of chinese Academy of sciences Beijing 100049 China

A gamma-ray burst （GRB） optical photometric follow-up system at the Xinglong observatory of national {2. observatories of china （NAOC） has been constructed. It uses the 0.8-m Tsinghua-NAOC Telescope （TNT） and the 1-m EST telescope, and can au- tomatically respond to GRB Coordinates Network （GCN） alerts. Both telescopes slew relatively fast, being able to point to a new target field within - 1 min upon a request. Whenever available, the 2.16-m NAOC telescope is also used. In 2.06 the system responded to 15 GRBs and detected seven early afterglows. In 2.07 six GRBs have been detected among 18 follow- up observations. TNT observations of the second most distant GRB 06092. （z = 5.5） are shown, which started as early as 91 s after the GRB trigger. The afterglow was detected in the combined image of the first 19 × 2. s unfiltered exposures. This GRB follow-up system has joined the East-Asia GRB Follow-up Observation Network （EAFON）.

关键词： gamma-rays: bursts gamma-rays: observations telescopes

Design of the CAPS Navigation and Communication Incorporated Terminals

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Design of the CAPS Navigation and Communication Incorporated...

Machine Learning-based Identification of Contaminated Images in light Curve Data Preprocessing

第三届中国卫星导航学术年会

作者： li shengming 1, 2., Hou jinshuang 1 , Wang zhaorui 1 , Fan jiangtao 1, 2.1 {2. astronomical observatories, chinese Academy of sciences, Beijing 100012. china 2.Graduate University of chinese Academy of sciences, Beijing 100049, china

Based on the chinese Area Positioning System （CAPS）, the paper gives a solution of terminal which incorporate satellite positioning and bi-direction message communication functions. With the small beam shaped antenna, the terminal can send back the kinetic carrier position and realize bi-direction communicate without track the satellite. The software and hardware of the terminal and the system signal structure of CAPS are also introduced. Analysis on the carborne experiments positioning and communication data shows that the designed terminal is suitable to the navigation and communication applications of moving vehicles, which support a new approach for the monitor and communication of ships and vehicles.

关键词： chinese Area Positioning System Navigation and Communication Incorporated Terminal Message Communication Signal Structure

来源： cnki会议评论

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cnki会议

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Research in Astronomy and Astrophysics 2024年第4期24卷 287-295页

作者： Hui li Rong-Wang li Peng Shu Yu-Qiang li yunnan observatories Chinese Academy of SciencesKunming 650216China University of chinese Academy of sciences Beijing 100049China key Laboratory of Space Object and Debris Observation Chinese Academy of SciencesNanjing 210023China

Attitude is one of the crucial parameters for space objects and plays a vital role in collision prediction and debris *** light curves to determine attitude is the most commonly used *** photometric observations,outliers may exist in the obtained light curves due to various ***,preprocessing is required to remove these outliers to obtain high quality light *** statistical analysis,the reasons leading to outliers can be categorized into two main types:first,the brightness of the object significantly increases due to the passage of a star nearby,referred to as“stellar contamination,”and second,the brightness markedly decreases due to cloudy cover,referred to as“cloudy contamination.”The traditional approach of manually inspecting images for contamination is time-consuming and ***,we propose the utilization of machine learning methods as a *** Neural Networks and SVMs are employed to identify cases of stellar contamination and cloudy contamination,achieving F1 scores of 1.00 and 0.98 on a test set,*** also explore other machine learning methods such as ResNet-18 and light Gradient Boosting Machine,then conduct comparative analyses of the results.

关键词： techniques:image processing methods:data analysis light pollution

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用月龄历谱法求解西周既望历日及其年代

天文学报 2002年第3期43卷 333-340页

作者：李勇中国科学院国家天文台北京100012

利用“月龄历谱法”求解16条西周既望材料,1)得出部分西周王年和既望历日的公历日期;2.推论武王克商年的上限为BC1040;3)指出西周既望的月龄并不固定,多在16-2.日间,其时历法行丑正.

关键词：月龄历谱法西周年代历书公历日期夏商周断代工程既望历日

The global image of the Moon obtained by the Chang'E-1:Data processing and lunar cartography

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Science china Earth sciences 2010年第8期53卷 1091-1102页

作者： li ChunLai1, liU Jian{2.1, REN Xin1, MOU lingli1, ZOU Yongliao1, ZHANG HongBo1, Lü Chang1, liU JianZhong1, ZUO Wei1, SU Yan1, WEN WeiBin1, BIAN Wei1, ZHAO BaoChang2. YANG JianFeng2. ZOU XiaoDuan1, WANG Min1, XU Chun1, KONG DeQing1, WANG XiaoQian1, WANG Fang1, GENG liang1, ZHANG ZhouBin1, ZHENG Lei1, ZHU XinYing1, li {2.Duo1 & OUYANG ZiYuan11 national astronomical {12., chinese Academy of sciences, Beijing 100012. china 2.Xi’an Institute of Optics and Precision Mechanics, chinese Academy of sciences, Xi’an 710119, china 1. national astronomical {2. Chinese Academy of Sciences Beijing 100012 China2. Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119 China

The global lunar image of the first phase of chinese Lunar Exploration Program is the first image that covered all over the surface of the Moon. It will serve as a critical foundation for succeeding exploration and scientific research. In this paper, the acquisition, characteristics, and data quality of Chang'E-1 CCD image data are described in detail. Also described are the methodology and procedure of data processing. According to rule of planetary cartography, the image data have been processed, geometrically corrected, and then mosaic{2.d and merged in a scale of 1:2.5 million. The results of data processing and charting show that the image data of Chang'E-1 CCD and their geometric precision meet the demand of charting a map in the scale of 1:2.5 million. The relative geometric positioning precision of the global image is better than 2.0 m, and the absolute geometric positioning precision is slightly better than that of the ULCN2.05 and Clementine lunar basemap (V2.0). The plane positioning precision is approximately 100-1500 m. This global image proves to be the best global image of the Moon so far in terms of space coverage, image quality, and positioning precision.

关键词： Chang’E-1 lunar CCD data processing lunar image position lunar global image

Laser altimetry data of Chang'E-1 and the global lunar DEM model

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Science china Earth sciences 2010年第11期53卷 1582-1593页

作者： li ChunLai1, REN Xin1, liU Jian{2.1, ZOU XiaoDuan1, MU lingli1, WANG JianYu2. SHU Rong2. ZOU Yongliao1, ZHANG HongBo1, Lü Chang1, liU JianZhong1, ZUO Wei1, SU Yan1, WEN WeiBin1, BIAN Wei1, WANG Min1, XU Chun1, KONG DeQing1, WANG XiaoQian1, WANG Fang1, GENG liang1, ZHANG ZhouBin1, ZHENG Lei1, ZHU XinYing1, li {2.Duo1 & OUYANG ZiYuan1 1 national astronomical {12., chinese Academy of sciences, Beijing 100012. china 2.Shanghai Institute of Technical Physics, chinese Academy of sciences, Shanghai 2.0083, china 1. national astronomical {2. Chinese Academy of Sciences Beijing 100012 China2. Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China

The Laser AltiMeter (LAM), as one of the main payloads of Chang'E-1 probe, is used to measure the topography of the lunar surface. It performed the first measurement at 02.2. on November 2.th, 2.07. Up to December 4th 2.08, the total number of measurements was approximately 9.12.million, covering the whole surface of the Moon. Using the LAM data, we constructed a global lunar Digtal Elevation Model (DEM) with 3 km spatial resolution. The model shows pronounced morphological characteristics, legible and vivid details of the lunar surface. The plane positioning accuracy of the DEM is 445 m (1σ), and the vertical accuracy is 60 m (1σ). From this DEM model, we measured the full range of the altitude difference on the lunar sur-face, which is about 19.807 km. The highest point is 10.62. km high, on a peak between crater Korolev and crater Dirichlet-Jackson at (158.656°W, 5.441°N) and the lowest point is -9.178 km in height, inside crater Antoniadi (172.413°W, 70.368°S) in the South Pole-Aitken Basin. By comparison, the DEM model of Chang'E-1 is better than the USA ULCN2.05 in accuracy and resolution and is probably identical to the DEM of Japan SELENE, but the DEM of Chang'E-1 reveals a new lowest point, clearly lower than that of SELENE.

关键词： Chang’E-1 laser altimetry lunar DEM topographic tops of the Moon

All-sky Guide Star Catalog for CSST

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Research in Astronomy and Astrophysics 2024年第4期24卷 35-59页

作者： Hui-Mei Feng Zi-Huang Cao Man I Lam Ran li Hao Tian Da-Yi Yin Yuan-Yu Yang Xin Zhang Dong-Wei Fan Yi-Qiao Dong Xin-Feng li Wei Wang Long li Hugh RAJones Yi-Han Tao Jia-Lu Nie Pei-Pei Wang Mao-Yuan liu He-jun Yang Chao liu key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China national astronomical {2. Chinese Academy of SciencesBeijing 100101China University of chineseAcademy of sciences Beijing 100049China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai200083China Technology and Engineering Center for Space Utilization.chinese Academy of {2. Beijing 100094China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Centre for Astrophysics University of HertfordshireHatfieldUK Beijing University of Technology Beijing 100124China

The china Space Station Telescope(CSST)is a two-meter space telescope with multiple back-end *** Fine Guidance Sensor(FGS)is an essential subsystem of the CSST Precision Image Stability System to ensure the required absolute pointing accuracy and line-of-sight *** this study,we construct the Main Guide Star Catalog for *** accomplish this,we utilize the information about the FGS and object information from the Gaia Data Release *** provide an FGS instrument magnitude and exclude variables,binaries,and high proper motion stars from the catalog to ensure uniform FGS guidance ***,we generate a HEALPix index,which provides a hierarchical tessellation of the celestial sphere,and employ the Voronoi algorithm to achieve a homogeneous distribution of stars across the *** distribution ensures adequate coverage and sampling of the *** performance of the CSST guide star catalog was assessed by simulating the field of view of the FGS according to the CSST mock survey strategy *** analysis of the results indicates that this catalog provides adequate coverage and *** catalog's performance meets the FGS requirements,ensuring the functioning of the FGS and its guidance capabilities.

关键词： catalogs astrometry instrumentation:detectors

OH/IR Stars with Carbon-rich Envelope

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天文研究与技术 1999年第S1期 339-343页

作者： Chen P. S., Wang X. H., He J. H. (yunnan observatory & United Laboratory of Optical Astronomy CAS) ({2. astronomical observatories, CAS, china)

candidates of OH/IR stars with SiC circumstellar envelope are given in this paper. It is shown from further study that among them 4 sources are indeed, 2.are possible both carbon stars with SiC feature and OH/IR stars... 详细信息

关键词： OH/IR Stars with Carbon-rich Envelope AS ROM IR