差分VLBI技术在采样返回任务中的应用

发布时间：2018-03-07 14:57

本文选题：深空探测　切入点：差分VLBI　出处：《天文学进展》2012年02期 　论文类型：期刊论文

【摘要】：针对采样返回任务中多探测器精密短弧定轨问题,研究了甚长基线干涉测量(Very Long Baseline Interferometry,VLBI)技术在两探测器间的交替观测模式、2π模糊度解算方法和数据差分处理方法,给出了星载信标的设计原则和方案。利用日本SELENE探月卫星的两个小卫星R-star和V-star的同波束VLBI相关相位生成了交替VLBI相位观测量,对其进行了差分处理求解差分时延,然后利用差分时延和测速测距数据进行定轨计算。对差分时延的分析表明,交替VLBI差分群时延RMS值为46 mm,测量精度与同波束VLBI差分群时延相当;交替VLBI差分相时延RMS值为1.6 mm,测量精度与同波束VLBI差分相时延相当。定轨结果表明,交替VLBI在进行多探测器的短弧定轨时能达到同波束VLBI相当的精度。
[Abstract]:In order to solve the problem of precise short-arc orbit determination of multi-detector in sampling return mission, the very long baseline interferometry (very Long Baseline Interferometric VLBII) technique in alternating observation mode between two detectors is studied in this paper. The ambiguity resolution method and data difference processing method between two detectors are also studied. The design principle and scheme of spaceborne beacons are presented. Alternating VLBI phase observations are generated by using the same beam VLBI correlation phases of two small satellites of Japanese SELENE lunar probe satellites R-star and V-star, and the differential delay is solved by differential processing. Then the orbit determination is calculated by using the data of differential delay and velocity-ranging. The analysis of differential delay shows that the RMS of alternating VLBI differential group is 46mm, and the measurement accuracy is equivalent to that of VLBI differential group with the same beam. The RMS value of alternating VLBI differential phase delay is 1.6 mm, and the measurement accuracy is equivalent to that of the same beam VLBI differential phase delay. The results of orbit determination show that the alternating VLBI can achieve the same precision as the same beam VLBI in the short arc orbit determination of multiple detectors.
【作者单位】：中国科学院上海天文台;
【基金】：中国科学院百人计划国家自然科学基金(11073048) 浦江人才计划(10PJ1411700) 863计划(SS2012AA121203)
【分类号】：P111

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