模拟对北斗和伽利略卫星的 L 波段 VLBI 观测,以实现帧绑定

IF 0.9 Q4 REMOTE SENSING
David Schunck, Lucia McCallum, G. Calves
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引用次数: 0

摘要

利用甚长基线干涉测量(VLBI)技术观测地球轨道卫星是建立框架联系的一个日益受到关注的课题。我们介绍了对北斗和伽利略卫星进行 L 波段 VLBI 观测的模拟研究,以调查 VLBI 和全球导航卫星系统(GNSS)之间技术间帧联系的准确性。我们采用了一个由 16 个天线组成的全球网络,这些天线配备了专用的 L 波段接收器,能够观测北斗的 B1 和 B3 导航信号以及伽利略的 E1 和 E6 导航信号。通过大量蒙特卡罗模拟,我们模拟了 24 小时的会话,以确定卫星与类星体扫描的最佳比例。最佳时间表使用了大约 80-90% 的卫星信号源。我们发现,10-20% 的类星体源观测可以改善对流层的估计,从而改善天线位置的估计。结合七个 24 小时时段的正态方程,我们得出了一个 7 天解决方案。天线位置的平均重复性为 7.3 毫米。我们将结果的局限性归结为对流层湍流、卫星轨道确定的不准确性以及缺乏分布更均匀的全球网络。这项模拟研究有助于人们理解利用 VLBI 观测与全球导航卫星系统卫星建立框架联系这一主题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simulating VLBI observations to BeiDou and Galileo satellites in L-band for frame ties
Using the very long baseline interferometry (VLBI) technique to observe Earth-orbiting satellites is a topic of increasing interest for the establishment of frame ties. We present a simulation study on VLBI observations to BeiDou and Galileo satellites in L-band to investigate the accuracy of inter-technique frame ties between VLBI and global navigation satellite system (GNSS). We employ a global network of 16 antennas equipped with dedicated L-band receivers capable of observing BeiDou’s B1 and B3 navigation signals and Galileo’s E1 and E6 navigation signals. Through extensive Monte Carlo simulations, we simulate 24-h sessions to determine the optimal ratio of satellite to quasar scans. The optimal schedule uses about 80–90% satellite sources. We find that the 10–20% observations of quasar sources improve the estimation of the troposphere and, consequently, the estimation of the antenna position. Combining the normal equations from seven 24-h sessions, we derive a 7-day solution. The average antenna position repeatability is 7.3 mm. We identify the limitations of the results as the tropospheric turbulence, inaccuracies in the satellite orbit determination, and the lack of a more homogeneously distributed global network. This simulation study supports the understanding in the topic of building a frame tie using VLBI observations to GNSS satellites.
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来源期刊
Journal of Geodetic Science
Journal of Geodetic Science REMOTE SENSING-
CiteScore
1.90
自引率
7.70%
发文量
3
审稿时长
14 weeks
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