Abstract Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) is a tracking technique based on a one-way ground to space Doppler link. For Low Earth Orbit (LEO) satellites, DORIS shows a robust capability in terms of data coverage and availability, due to a wide and well-distributed ground network, where data are made available by the International Doris Service (IDS). However, systematic errors remain in the DORIS data, such as instabilities of the on-board clock due to radiation encountered in space, which limit the accurate determination of station positions. The DORIS on-board clock frequency stability is degraded by the increased radiation found in the region of the South Atlantic Anomaly (SAA) and has been shown to degrade station position estimation. This paper introduces a new model correction to the DORIS data for the frequency of the Jason-2 Ultra Stable Oscillator (USO), derived from the Time Transfer by Laser Link (T2L2) experiment (Belli and Exertier, 2018). We show that a multi-satellite DORIS solution including this T2L2-corrected data applied to the frequency modelling for The DORIS data, improves the estimation of station coordinates. We show the tie residuals with respect to collocated GPS stations are improved by several millimeters. We also demonstrate that the 117-day (Jason-2) draconitic signal in the geophysical parameters is reduced, implying that the origin of this signal is not just solar radiation pressure mis-modeling, but also radiation-induced clock perturbations on the Jason-2 DORIS Ultra-Stable-Oscillator (USO). Finally we demonstrate through comparisons with the International Earth Rotations and Reference Systems Service (IERS) C04 series for Earth Orientation Parameters (EOP), that the estimation of EOP is improved in both a Jason-2 DORIS-only and a multi-satellite DORIS solution for EOP.

中文翻译：

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Jason-2/T2L2 超稳定振荡器频率模型对 DORIS 台站坐标和地球定向参数的影响

摘要 卫星多普勒轨道成像与无线电定位集成（DORIS）是一种基于单向地空多普勒链路的跟踪技术。对于低地球轨道 (LEO) 卫星，由于拥有广泛且分布良好的地面网络，国际多丽丝服务 (IDS) 提供数据，因此 DORIS 在数据覆盖范围和可用性方面表现出强大的能力。然而，DORIS 数据中仍然存在系统误差，例如由于太空中遇到的辐射导致机载时钟不稳定，这限制了站点位置的准确确定。DORIS 机载时钟频率稳定性因在南大西洋异常区 (SAA) 地区发现的辐射增加而降低，并且已被证明会降低站点位置估计。本文介绍了针对 Jason-2 超稳定振荡器 (USO) 频率的 DORIS 数据的新模型校正，该模型源自激光链接时间传递 (T2L2) 实验（Belli 和 Exertier，2018 年）。我们展示了一个多卫星 DORIS 解决方案，包括应用于 DORIS 数据频率建模的 T2L2 校正数据，改进了站点坐标的估计。我们展示了与并置 GPS 站相关的联系残差提高了几毫米。我们还证明地球物理参数中的 117 天 (Jason-2) 龙龙石信号减少，这意味着该信号的起源不仅是太阳辐射压力建模错误，还包括 Jason- 2 DORIS 超稳定振荡器 (USO)。