Gravity Field Recovery Using High-Precision, High-Low Inter-Satellite Links
Gravity Field Recovery Using High-Precision, High-Low Inter-Satellite Links
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DOI：
10.3390/rs11050537
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
M. Hauk;R. Pail
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文献类型：
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作者：
M. Hauk;R. Pail
来自重力恢复和气候实验（GRACE）的过去的时间重力场解以及来自GRACE后续的当前解由于待恢复的信号的欠采样而遭受时间混叠误差（例如，水文学），这是由南北观测方向引起的条纹。本文研究了通过高低星间链路（移动的）使命建立的质量变化观测系统的潜力。我们量化的仪器误差的主要传感器（星间链路和加速度计）和高频潮汐和非潮汐重力信号的时间重力场反演的可实现的性能的影响。具有径向分量的强优势的移动的概念的多方向观测几何结构导致接近各向同性的误差行为，并且检索的重力场解决方案显示与低-低卫星对配置相比，非潮汐以及潮汐质量变化信号的时间混叠误差至少降低30%。移动的距离观测的质量使得能够应用扩展的替代处理方法，从而进一步减少时间混叠误差。结果表明，这样一项使命有助于更好地了解地球系统的不同组成部分。
Past temporal gravity field solutions from the Gravity Recovery and Climate Experiment (GRACE), as well as current solutions from GRACE Follow-On, suffer from temporal aliasing errors due to undersampling of the signal to be recovered (e.g., hydrology), which arise in terms of stripes caused by the north–south observation direction. In this paper, we investigate the potential of the proposed mass variation observing system by high–low inter-satellite links (MOBILE) mission. We quantify the impact of instrument errors of the main sensors (inter-satellite link and accelerometer) and high-frequency tidal and non-tidal gravity signals on achievable performance of the temporal gravity field retrieval. The multi-directional observation geometry of the MOBILE concept with a strong dominance of the radial component result in a close-to-isotropic error behavior, and the retrieved gravity field solutions show reduced temporal aliasing errors of at least 30% for non-tidal, as well as tidal, mass variation signals compared to a low–low satellite pair configuration. The quality of the MOBILE range observations enables the application of extended alternative processing methods leading to further reduction of temporal aliasing errors. The results demonstrate that such a mission can help to get an improved understanding of different components of the Earth system.