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arXiv 0908.1905physics.space-phphysics.ao-ph
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电离层扰动对GPS时间和频率传递的影响

Influence of ionospheric perturbations in GPS time and frequency transfer

Sophie Pireaux, Pascale Defraigne, Laurence Wauters, Nicolas Bergeot, Quentin Baire, Carine Bruyninx

摘要:

全球定位系统时间和频率传递的稳定性受到全球定位系统信号穿过电离层这一事实的限制。在高精度大地时间传递(即基于代码和载波相位全球定位系统数据的精确建模)中,在两个频率上进行的代码和载波相位测量的所谓无电离层组合被用来消除一阶电离层效应。在本文中,我们调查剩余的二阶和三阶电离层效应的影响大地时间传递解决方案,即远程原子钟比较的基础上GPS测量,使用ATOMIUM软件开发的比利时皇家天文台(ROB)。三阶电离层效应的影响被证明可以忽略不计,而对于二阶效应,在不同时间环节和不同时期进行的测试表明,在平静的一天,影响很小,约为几皮秒,在电离层活动频繁的情况下,影响可达10皮秒以上。2003年10月30日的地磁暴被用来说明空间天气产品如何与理解大地测量时间和频率转移中的扰动相关。

英文摘要:

The stability of GPS time and frequency transfer is limited by the fact that GPS signals travel through the ionosphere. In high precision geodetic time transfer (i.e. based on precise modeling of code and carrier phase GPS data), the so-called ionosphere-free combination of the code and carrier phase measurements made on the two frequencies is used to remove the first-order ionospheric effect. In this paper, we investigate the impact of residual second- and third-order ionospheric effects on geodetic time transfer solutions i.e. remote atomic clock comparisons based on GPS measurements, using the ATOMIUM software developed at the Royal Observatory of Belgium (ROB). The impact of third-order ionospheric effects was shown to be negligible, while for second-order effects, the tests performed on different time links and at different epochs show a small impact of the order of some picoseconds, on a quiet day, and up to more than 10 picoseconds in case of high ionospheric activity. The geomagnetic storm of the 30th October 2003 is used to illustrate how space weather products are relevant to understand perturbations in geodetic time and frequency transfer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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