同波束VLBI在采样返回式多目标探测器精密测轨测位中的应用

发布时间：2018-03-02 09:28

本文关键词： 同波束VLBI 差分相位时延多目标探测器精密定轨重力场探测　出处：《中国科学:物理学力学天文学》2010年06期 　论文类型：期刊论文

【摘要】：同波束VLBI即用射电望远镜的主波束同时观测角距很小的两个探测器发出的巧妙配置的多频点信标,据此得到两探测器在两个测站间的误差为皮秒量级的差分相位时延.在月球卫星SELENE的两个小卫星Rstar和Vstar的测定轨中,利用40多分钟的同波束VLBI和测速测距数据数小时的短弧定轨精度已显著提高,而一年多的定轨结果表明弧长数天的长弧定轨精度已达10m左右,充分证明了同波束VLBI在多目标卫星精密测定轨中的作用.本文在介绍SELENE同波束VLBI观测、多普勒数据处理和定轨结果的基础上,以用于月球采样返回探测任务中的多目标探测器如轨道器、着陆器和返回器为例,给出各探测器搭载电波源的信标设计方案及设计原则,并分析S频段多频点同波束VLBI技术在轨道器和着陆器绕月飞行、着陆器月球软着陆、着陆器月球采样、返回器从月面上升、返回器多次变轨、特别是轨道器和返回器交会对接等各个测控段的高精度测定轨或测定位及月球重力场探测中的应用.
[Abstract]:In the same beam VLBI, the smart multi-frequency beacons emitted by two detectors with small angular distances are simultaneously observed by the main beam of the radio telescope. On the basis of this, the differential phase delay of the two detectors in the order of picosecond between the two stations is obtained. In the determination orbit of the two small satellites Rstar and Vstar of the lunar satellite SELENE, The accuracy of short-arc orbit determination using the same beam VLBI for more than 40 minutes and the ranging data for several hours has been greatly improved, and the orbit determination results of more than one year show that the accuracy of long-arc orbit determination for several days of arc length has reached about 10m. This paper fully proves the role of the same beam VLBI in the precise orbit determination of multi-target satellites. Based on the introduction of the results of SELENE VLBI observation, Doppler data processing and orbit determination, Taking multi-target detectors such as orbiter, lander and returner as examples, the design scheme and design principle of beacons carrying radio wave sources are given. This paper also analyses the S-band multi-frequency point and same beam VLBI technology flying around the moon of orbiter and lander, the lunar soft landing of lander, the lunar sampling of lander, the rise of returner from the lunar surface, and the multiple orbit changes of the returner. Especially, the application of orbit or position measurement and lunar gravity field detection in various measurement and control sections, such as orbiter and returner rendezvous and docking, etc.
【作者单位】：中国科学院上海天文台;日本国立天文台RISE
【基金】：国家自然科学基金(批准号:11043004) 中国科学院百人计划国家高技术研究发展计划(编号:2008AA12A209,2008AA12A210)资助项目
【分类号】：P135

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