共查询到20条相似文献，搜索用时 125 毫秒
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天籁实验抛物柱面天线阵结构设计与力学分析 总被引：1，自引：0，他引：1
为了满足大面积天区的射电巡天观测,完成对大尺度结构的精确测量和对暗能量的探测,需要设计可安装大量馈源单元的大规模射电干涉阵列天线。抛物柱面的结构形式能较好满足工作需求,对抛物柱面天线阵进行了结构的选型设计。基于有限元方法及有限元分析软件,建立了用于暗能量射电探测的抛物柱面天线阵结构的有限元模型,计算分析了在重力、冰雪和风力等载荷作用时反射面的变形情况。仿真计算分析结果表明:设计的用于暗能量射电探测的天线结构在各种工况下反射面变形量较小,能满足各项设计技术指标要求,从而验证了天线阵结构的合理性、稳定性和可靠性。 相似文献
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观测控制系统是为LAMOST(大天区面积多目标光纤光谱天文望远镜)开发的基于网络的、自动运行观测流程的软件系统。在研究观测控制系统的实际网络拓扑结构和通信协议的基础上,利用网络模拟软件NS2对其进行模拟和分析,并对网络性能进行了实测。网络模拟和实测的结果证明,目前开发的观测控制系统在现有的网络结构和通信协议下能够稳定工作。同时,本研究也为观测控制系统的网络故障诊断提供了方法。 相似文献
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本文用团分析法分别对距离类D＝5及D＝6的Abell－ACO团的二维分布进行了分析．分析的目的是探讨星系团分布中可能存在的超大尺度结构．分析结果表明：富星系团分布中的确存在尺度≥100h-1Mpc的超大尺度结构．本文的分析为超大尺度结构的存在提供了又一支持． 相似文献
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本介绍了VLBI的SOLVK软件系统的结构，并对其进行了三个方面的改进工作；1、编制了Make-Process程序；2、改进了CALC软件中的相对论时延；3、建立了残差件。 相似文献
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云台厚片CCD光谱系统自建立以来,基本上还只是一个封闭的系统:储存在5吋软盘中的数据只能在该系统的计算机中读出和简单处理,但该系统的计算机硬件和软件均不能满足现代光谱处理的要求。本文在将厚片CCD光谱资料转换到VAX计算机的基础上,对资料转换及其必要性以及该光谱系统的硬、软件配置进行了初步的分析与讨论。 相似文献
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王广利 《中国科学院上海天文台年刊》1996,(17):332-337
本文通过对MK3数据库的结构分析以及与NGS文件的比较，描述了从MK3数据库格式转化到NGS格式的格式转换程序DB2NGS的开发思想，并给出了一个示范结果。通过在微机上的KVLBI软件的运行证明了转换是成功的。 相似文献
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脉冲星发射的辐射信号经过星际介质到达观测天线的过程中,存在色散效应。该效应导致有一定带宽脉冲信号的不同频率成份到达天线时间有延迟,影响对脉冲星的观测。消色散技术是脉冲星观测的关键技术,它对脉冲星观测系统的灵敏度和观测精度至关重要。脉冲星相干消色散过程是:通过对观测信号进行Nyquist采样,对采样数据做傅立叶变换,变换后的频域信号与星际介质Chirp函数乘积,然后再做逆傅立叶变换回时域,得到消色散后的时域信号。乌鲁木齐天文站依托现有的南山25m射电望远镜和VLBI记录终端MK5A系统,自行开发的相干消色散处理软件(Linux操作系统下C语言调用MPI库)和4节点机群系统,建立了脉冲星相干消色散观测系统。 相似文献
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《New Astronomy Reviews》1999,43(8-10):523-526
The VLBA Data Recording System was designed to support a peak aggregate data rate of 512 Megabits per second initially, and be expandable to peak aggregate rates of 1024 Megabits per second (“1 Gbps”). Budgetary constraints prevented even the planned initial capability from being completed as part of the VLBA construction project, and it is only now nearing completion. In the meantime, while the VLBA was being completed, Haystack Observatory developed and partially implemented the design of the Mark 4 recording system, a further development beyond the Mark 3A system upon which the VLBA system design was based. Mark 4 can record at aggregate data rates up to 1 Gbps. To maintain the VLBA's competitiveness in terms of sensitivity, and in particular to be ready for the ARISE Space VLBI mission's wideband data downlink, it is time now to exercise the expansion option designed into the VLBA Data Recording System. This paper describes current plans within NRAO for such a development. Besides the Gbps implementation originally foreseen for the VLBA Data Recording System, development of the Mark 4 system has made possible as alternative implementation. The relative merits of these two implementations are discussed. 相似文献
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The paper describes the design and the realization of a multiple-function photoelectric photometer made by Trieste Observatory
for Torino Observatory. The system design shows a two-beam, sequential multiband photon counting and analog photoelectric
photometer configuration based on a PDP8/E computer for the control and data acquisition and elaboration. The actual realization
of the system and the use of it in the one-beam configuration operating now at torino Observatory shows the advantages of
such a solution and the easiness in modifying and determining the system functions by software programs rather than by hardware
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Work supported by Consiglio Nazionale delle Ricerche, Gruppo Nazionale di Astronomia, Settore Tecnologie Astronomiche. The
realization of the machine was fully supported by Torino Observatory. Trieste Observatory-Instruments and Data Processing
Group (5/76). 相似文献
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We propose a cooperative observational project of using the photo-electric astrolabe Mark I of Shaanxi Observatory in Irkutsk. As the instrument will be equipped with a Z = 45° angle prism, it will have no blind zone when used at latitude (φ = 52°. Important contribution can be expected to the establishing of fundamental reference system and the maintenance of the Hipparcos Catalogue system. 相似文献
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2009年11月,云南天文台射电天文研究团组采用40 m射电望远镜以及基于DBBC(Digital Base Band Conveter)和Mark 5B的VLBI记录系统对PSR J0835-4510和PSRJ0332+5434进行了观测。观测选用S波段右旋圆极化信号,起始频率为2 206.99 MHz,总带宽为32 MHz。对数据进行相干消色散和平均后,得到PSR J0332+5434的单脉冲图像和两颗脉冲星的平均脉冲轮廓。由平均轮廓的展宽随时间的变化关系,对脉冲星的视周期作了一定修正后,得到信噪比更高的平均轮廓图。最后对轮廓的信噪比随时间的变化作了初步分析,由此可了解整个系统在观测时的稳定性。 相似文献
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2009年11月,云南天文台射电天文研究团组采用40m射电望远镜以及基于DBBC（Digital Base Band Conveter）和Mark5B的VLBI记录系统对PSRJ08354510和PSRJ0332＋5434进行了观测。观测选用S波段右旋圆极化信号,起始频率为2206．99MHz,总带宽为32MHz。对数据进行相干消色散和平均后,得到PSRJ0332＋5434的单脉冲图像和两颗脉冲星的平均脉冲轮廓。由平均轮廓的展宽随时间的变化关系,对脉冲星的视周期作了一定修正后,得到信噪比更高的平均轮廓图。最后对轮廓的信噪比随时间的变化作了初步分析,由此可了解整个系统在观测时的稳定性。 相似文献
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本语文介绍了由南京大学天文系和紫金山天文台研究人员共同开发的ＨαＣＣＤ图像实时采集和处理系统。给出该系统硬件结构、软件各部分的功能、图像文件格式以及使用方法。 相似文献
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I. B. Vavilova L. K. Pakulyak A. A. Shlyapnikov Yu. I. Protsyuk V. E. Savanevich I. L. Andronov V. N. Andruk N. N. Kondrashova A. V. Baklanov A. V. Golovin P. N. Fedorov V. S. Akhmetov I. I. Isak A. E. Mazhaev V. V. Golovnya N. V. Virun A. V. Zolotukhina L. V. Kazantseva N. A. Virnina V. V. Breus S. G. Kashuba L. L. Chinarova L. S. Kudashkina V. P. Epishev 《Kinematics and Physics of Celestial Bodies》2012,28(2):85-102
This paper reviews the most important components of the national project of the Ukrainian Virtual Observatory (UkrVO). Among them, there is the establishment of a Joint Digital Archive (JDA) of observational data, which has been obtained at Ukrainian observatories since the 1890s, including an astronegative JDA (more than 200 thousand plates). Since this task requires VO-oriented software, such issues as content verification software, integrity and administration of the JDA, compliance of image formats with the IVOA standards, and photometric and astrometric calibration of images are considered as the most important directions of software development, which carried out by members of the UkrVO. The scientific projects using local data archives of the UkrVO are discussed, namely: an analysis of a long observational series of active galactic nuclei, the study of solar flares and solar active regions based on spectral observational archives, research and discovery of variable stars, and the study of stellar fields in the vicinity of gamma-ray bursts. Particular attention is devoted to the CoLiTec Program that permits us to increase a number of observed solar system bodies and allows us to discover new bodies; for example, the C/2010 (Elenin) and P/2011 N01 comets were discovered using this program at the ISON-NM Observatory. The paper notes the creation of the UkrVO JDA prototype that provides access to the databases of the Main Astronomical Observatory, National Academy of Sciences of Ukraine (MAO NAS of Ukraine); Nikolaev Astronomical Observatory (NAO); and Lvov Astronomical Observatory. 相似文献