月基望远镜探测能力的地面标定

徐亮; 赵建科; 薛勋; 刘峰; 胡丹丹

doi:10.3788/OPE.20122005.0972

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月基望远镜探测能力的地面标定

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- 月基望远镜探测能力的地面标定
- Detectability calibration of lunar-based optical telescope on ground
- 光学精密工程 2012年20卷第5期页码：972-978
- 作者机构：
  
  中国科学院西安光学精密机械研究所,陕西西安 710119
- 作者简介：
- 基金信息：
  
  中国探月工程二期项目()
- DOI：10.3788/OPE.20122005.0972
  中图分类号： TN23;TH743
- 收稿日期：2012-02-12，
  
  修回日期：2012-03-02，
  
  网络出版日期：2012-05-10，
  
  纸质出版日期：2012-05-10
- 稿件说明：
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徐亮, 赵建科, 薛勋, 刘峰, 胡丹丹. 月基望远镜探测能力的地面标定[J]. 光学精密工程, 2012,20(5): 972-978

XU Liang, ZHAO Jian-ke, XUE Xun, LIU Feng, HU Dan-dan. Detectability calibration of lunar-based optical telescope on ground[J]. Editorial Office of Optics and Precision Engineering, 2012,20(5): 972-978
徐亮, 赵建科, 薛勋, 刘峰, 胡丹丹. 月基望远镜探测能力的地面标定[J]. 光学精密工程, 2012,20(5): 972-978 DOI： 10.3788/OPE.20122005.0972.

XU Liang, ZHAO Jian-ke, XUE Xun, LIU Feng, HU Dan-dan. Detectability calibration of lunar-based optical telescope on ground[J]. Editorial Office of Optics and Precision Engineering, 2012,20(5): 972-978 DOI： 10.3788/OPE.20122005.0972.

摘要

采用模拟试验在地面测试了月基望远镜(LOT)的星等探测信噪比及弥散斑能量集中度

用以验证望远镜的探测能力。与传统的通过分析CCD各项参数对噪声的影响来获得信噪比的方法不同

本文提出的方法客观、直接地通过图像信息来计算星点目标信噪比

其目标信噪比测试不确定度可优于8%。在测试弥散斑能量集中度时

通过质心算法求其弥散斑能量中心

进而提出了一种星点弥散斑高斯拟合方法来拟合弥散斑能量分布曲线。这种高斯拟合方法可使弥散斑能量集中度的测试精度提高10%。最后

通过试验测试了LOT相机星等探测信噪比及弥散斑能量集中度

验证了LOT相机+15 Mv的探测能力。

Abstract

The Signal-to-noise Ratio (SNR) of star-level detection and the energy concentration of a dispersed spot for an lunar-based Optical Telescope(LOT) are tested by using a simulation experiment on ground to verify its detection capability. Unlike the conventional methods that use the effect of CCD hardware parameters on the noise to test the SNR

the new test method directly uses the observation information to compute the SNRs of star targets and the tested uncertainty of object SNRs can be better than 8%. In the test of energy concentration

the centroid algorithm is used to computer the center of the dispersed spot and a Gaussian fitting method is proposed to fit the curve of the energy distribution. The Gaussian fitting method can significantly improve the detection precision of the energy concentration for the dispersed spot

and the testing precision has been improved by 10%. Finally

the detection capability of +15Mv of the LOT is verified by an experiment on the SNR of star level detection and the energy concentration of dispersed spot for the LOT.

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Keywords

references

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