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题名:
地月系L2点中继星激光测距成功率的估算
其他题名: Estimates of the success probability for relay satellite laser ranging around EM L2 point
作者: 李春晓1,2; 高清鹏1,2; 李语强1; 李祝莲1
刊名: 天文研究与技术(Astronomical Research & Technology)
出版日期: 2018-07
DOI: 10.14005/j.cnki.issn1672-7673.20180703.001
分类号: P171.3 ; P228.5
学科分类: 天文学::天体测量学
产权排序: 第1完成单位
收录类别: CSCD
关键词: 中继星激光测距 ; L2点晕轨道 ; 测距成功率
中文摘要: 为了确定月球与即将发射到地月系L2点的中继星之间的位置关系进而估算中继星激光测距的成功率,按照晕轨道周期为14天左右的要求对中继星所在的晕轨道进行了计算,并建立了一个综合考虑望远镜抖动、大气抖动和预报轨道横向偏离的模型。从数值上给出了一条轨道周期为14.78天,X方向(地月连线方向)的振幅为12493km,Y方向为34596km,Z方向(垂直于地月轨道平面方向)为11916km的周期轨道。由于晕轨道的最小振幅远大于月球遮挡的临界振幅4000km,因此月球对中继星不存在遮挡问题。基于上面建立的测距成功率模型,根据昆明站(国际编号:7820)的激光测距系统对运行在该晕轨道上的中继星进行测距成功率分析,结果表明:测距成功率随着中继星横向轨道标准差的增大呈现快速降低的趋势。对于中继星到测站的平均距离而言,当中继星没有横向偏离时,探测器产生的光电子数为0.151,成功率为14.07%;横向偏离2km时,光电子数降为0.035,成功率降为3.46%。对比最近距离与最远距离的情况,无横向偏移的情况下,探测器产生的光电子数从0.174降为0.139,成功率从16.01%降为13.02%。根据上面所有的计算结果,为后续云南天文台1.2m望远镜实现中继星激光测距提供参考。
英文摘要: In order to identify the positional relationship between the Moon and the incoming relay satellite on a halo orbit around L2 of the Earth-Moon system, and then to evaluate the laser ranging success probability, in this paper we make a computation on the halo orbit with a request of about 14 days in its period, and establish a model given the tremble of the telescope, of the atmosphere and the transverse deviation from the predicted orbit. A numerical halo orbit is given with the period of 14.78 days, the amplitude of 24986km in X(along the line of Earth and Moon), 69192km in Y, 23832km in Z(orthogonal to the orbit plane of Earth and Moon). The minimum amplitude of the calculated halo orbit goes far beyond the Moon-sheltered critical amplitude which is generally 4000km, thus no shade from the Moon on the relay satellite is existed. Based on the model of laser ranging success probability established previously, we make an analysis on the success probability according the laser ranging system at KUNL station(International ID:7820), the results indicating that the laser ranging success probability rapidly drops down with the increase of the orbit transverse standard deviation. For the average distance from the station to the relay satellite, the detector produces about 0.151 photoelectrons within a single pulse and the corresponding success probability is 14.07% when there is no deviation from the predicted orbit; the number of photoelectrons drops down to 0.035 and the corresponding success probability down to 3.46% when the relay satellite transversely deviates 2km from the predicted orbit. Comparing between the nearest distance and the furthermost distance, with no deviation, the number of photoelectrons declines to 0.139 from 0.174 and the corresponding success probability down to 13.02% from 16.01%. All of the above results provide a reference for the realization of the relay satellite laser ranging with 1.2m telescope at Yunnan Observatory in the following days.
项目资助者: 国家自然科学天文联合基金(U1631134)
语种: 中文
ISSN号: 1672-7673
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12368
Appears in Collections:应用天文研究组_期刊论文

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作者单位: 1.中国科学院云南天文台,云南,昆明,650011
2.中国科学院大学,北京,100049

Recommended Citation:
李春晓,高清鹏,李语强,等. 地月系L2点中继星激光测距成功率的估算[J]. 天文研究与技术(Astronomical Research & Technology),2018.
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文件名: 地月系L2点中继星激光测距成功率的估算_李春晓.pdf
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