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本文通过对天体测量仪器光子计数模拟资料的处理,比较了13种不同的平滑模型和两种定心算法对最终精度的影响;提出了利用频率域滤波和修正矩方法相结合的最佳处理方法;并对比较结果进行了多方面的讨论。 相似文献
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1 ＩｎｔｒｏｄｕｃｔｉｏｎＳｉＯ ,Ｈ2 ＯａｎｄＯＨｍａｓｅｒｅｍｉｓｓｉｏｎｓａｒｅｃｏｍｍｏｎｐｈｅｎｏｍｅｎａａｓｓｏｃｉａｔｅｄｗｉｔｈｔｈｅｃｉｒｃｕｍｓｔｅｌｌａｒｓｈｅｌｌｓｏｆｌａｔｅｔｙｐｅｓｔａｒｓ .ＳｉＯｍａｓｅｒｅｍｉｓｓｉｏｎｓｈａｖｅｂｅｅｎｄｅｔｅｃｔｅｄｆｒｏｍｓｅｖｅｒａｌｈｕｎｄｒｅｄｓｏｆｌａｔｅｔｙｐｅｓｔａｒｓｏｆｓｐｅｃｔｒａｌｔｙｐｅＭ 4ｏｒｌａｔｅｒ.ＳｉＯｍａｓｅｒｉｓｃｏｎｓｉｄｅｒｅｄｔｈｅｍｏｓｔｐｒｅｖａｌｅｎｔｍａｓｅｒｉｎｌａｔｅｔｙｐ… 相似文献
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Agegraphic dark energy (ADE) and New-ADE models have been introduced as two candidates for dark energy to explain the accelerated expansion phase of the Universe. In spite of a few suitable features of these models some studies have shown that there are several drawbacks in them. Therefore in this investigation a new version of ADE and New-ADE are studied which can improve such drawbacks appearing in the ordinary ADE and New-ADE scenario. In fact we consider an interacting model of scalar field with matter and after re-deriving some cosmological parameters of the model, we find out the best fit for the model. Actually by finding the best fitting for free parameters of the model, we show that our theoretical results are in a good agreement with observational data. 相似文献
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本工作是为今后在1.2米望远镜上利用商用CCD配备录像机进行人卫快速精密定位观测所做的初步试验,其目的是在实验室里模拟检测商用CCD配备录像机后对星像的绝对及相对定位精度。通过使用不同图像板及录像带在不同幅度的CCD视频信号情况下的分组试验,得到了满足人卫观测的结果,CCD对绝对位置及相对位置的定位误差均小于±0.5个象元。本文还对误差产生的原因进行了初步分析。 相似文献
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Yunfang Cai Zhi Xu Zhenggang Li Yongyuan Xiang Yuchao Chen Yu Fu Kaifan Ji 《Solar physics》2017,292(10):150
We present a precise and complete procedure for processing spectral data observed by the one-meter New Vacuum Solar Telescope (NVST). The procedure is suitable for both sit-and-stare and raster-scan spectra. In this work, the geometric distortions of the spectra are first corrected for subsequent processes. Then, considering the temporal changes and the remnants of spectral lines in the flat-field, the original flat-field matrix is split into four independent components to ensure a high-precision flat-fielding correction, consisting of the continuum gradient matrix, slit non-uniform matrix, CCD dust matrix, and interference fringe matrix. Subsequently, the spectral line drifts and intensity fluctuations of the science data are further corrected. After precise reduction with this procedure, the measuring accuracies of the Doppler velocities for different spectral lines and of the oscillation curves of the chromosphere and photosphere are measured. The results show that the highest measuring accuracy of the Doppler velocity is within \(100~\mbox{m}\,\mbox{s}^{-1}\), which indicates that the characteristics of the photosphere and chromosphere can be studied cospatially and cotemporally with the reduced spectra of the NVST. 相似文献
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天文选址是天文研究的重要组成部分。在野外无人环境下,如何最大程度地确保望远镜正常工作是当前天文选址的迫切需求。实现了一套可以应用于野外天文定点选址情况下通过网络进行远程电源开关控制的电源控制系统,并可以根据需要实现视频图像的采集与现场状态监控。系统采用低功耗、低成本、高性能的S3C2440处理器为核心的ARM9开发,内嵌Linux操作系统,采用RS485总线与电源开关电路控制模块通信;通过OV9655的COMS摄像头采集视频。系统基于B/S构架,直接使用浏览器进行远程控制与监控,实现远程设备供电、断电复位、紧急情况强切,远端现场状态监控。此外,系统在自主望远镜维护上也有较好的应用价值。 相似文献