What can be expected from GNSS tracking of satellite constellations for temporal gravity field model determination?
What can be expected from GNSS tracking of satellite constellations for temporal gravity field model determination?
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通过 GNSS 跟踪卫星星座来确定时间重力场模型可以期待什么？
DOI：
10.1093/gji/ggaa177
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发表时间：
2020-07
影响因子：
2.8
通讯作者：
Wei Min
中科院分区：
文献类型：
--
作者：
Zhou Hao;Zhou Zebing;Luo Zhicai;Wang Kang;Wei Min
本文的目标是通过一对夫妇的高低卫星到卫星跟踪（HLSST）任务的时间重力场测定的预期改善。利用GRACEGPS跟踪数据确定月重力场模型，对模拟系统进行了验证。检索到的解决方案和其他官方机构开发的解决方案之间的一般一致性表明我们的软件的良好性能。然后，使用包括所有误差分量的全误差源进行5年全尺寸模拟。对各误差分量的分析表明，轨道误差是影响HLSST重力场模型误差的主要因素。因此，当轨道精度提高一个数量级时，月解的噪声水平预计将在海洋上空的RMSE方面降低90%。至于目前的HLSST使命，包括一个现有的全球导航卫星系统接收器和一个加速度计（敏感轴和非敏感轴的噪声分别为10−10和10−9 m s-2），预计将以约1300公里（或2000公里）的空间分辨率观测每月（或每周）的重力解。至于卫星星座，通过增加倾角为70°的第二颗卫星和倾角为50°的第三颗卫星，预计将有重大改进。当使用两个（或三个）HLSST任务的观测值时，累积大地水准面高度误差方面的噪声减少约为51%（或62%）。此外，与一次HLSST使命相比，三次（或两次）HLSST任务的每周解的准确性预计将提高40- 70%（或27- 59%）。由于费用低廉，建立一个HLSST卫星星座是值得的，以填补专用的时间重力场探测任务之间可能存在的差距。
The goal of this contribution is to investigate the expected improvement of temporal gravity field determination via a couple of high-low satellite-to-satellite tracking (HLSST) missions. The simulation system is firstly validated by determining monthly gravity field models within situ GRACE GPS tracking data. The general consistency between the retrieved solutions and those developed by other official agencies indicates the good performance of our software. A 5-yr full-scale simulation is then performed using the full error sources including all error components. Analysis of each error component indicates that orbit error is the main contributor to the overall HLSST-derived gravity field model error. The noise level of monthly solution is therefore expected to reduce 90 per cent in terms of RMSE over ocean when the orbit accuracy improves for a magnitude of one order. As for the current HLSST mission consisting of a current GNSS receiver and an accelerometer (10−10 and 10−9 m s–2 noise for sensitive and non-sensitive axes), it is expected to observe monthly (or weekly) gravity solution at the spatial resolution of about 1300 km (or 2000 km). As for satellite constellations, a significant improvement is expected by adding the second satellite with the inclination of 70° and the third satellite with the inclination of 50°. The noise reduction in terms of cumulative geoid height error is approximately 51 per cent (or 62 per cent) when the observations of two (or three) HLSST missions are used. Moreover, the accuracy of weekly solution is expected to improve 40–70 per cent (or 27–59 per cent) for three (or two) HLSST missions when compared to one HLSST mission. Due to the low financial costs, it is worthy to build a satellite constellation of HLSST missions to fill the possible gaps between the dedicated temporal gravity field detecting missions.
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影响因子：
4.4
作者：
M. Weigelt;M. Sideris;N. Sneeuw
通讯作者：
M. Weigelt;M. Sideris;N. Sneeuw
不同运动学经验参数处理策略对时间重力场模型确定的影响
DOI：
10.1029/2018jb015556
发表时间：
2018-11
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
Hao Zhou;Zhicai Luo;Zebing Zhou;Qiong Li;Bo Zhong;Biao Lu;Houze Hsu
通讯作者：
Houze Hsu
影响因子：
2.8
作者：
U. Meyer;A. Jäggi;Yoomin Jean;G. Beutler
通讯作者：
U. Meyer;A. Jäggi;Yoomin Jean;G. Beutler
影响因子：
8.2
作者：
C. Hwang;Ting-Jung Lin;T. Tseng;B. Chao
通讯作者：
C. Hwang;Ting-Jung Lin;T. Tseng;B. Chao
影响因子：
1.9
作者：
Schreiter, Lucas;Arnold, Daniel;Jaggi, Adrian
通讯作者：
Jaggi, Adrian