为整个GOCE任务重新处理了精确的科学轨道和重力场恢复
Daniel Arnold1, Thomas Grombein1,2, Lucas Schreiter1,3
1Astronomical Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.
Journal of geodesy
|July 3, 2023
概括
重新加工的GOCE精确科学轨道 (PSO) 显著减少了电离层工件,改善了地球.
科学领域:
- 地质测量和地球观测
- 卫星轨道的确定
- 重力场建模 重力场建模
背景情况:
- 欧洲航天局的重力场和稳定状态海洋循环探测器 (GOCE) 任务旨在确定地球的静态重力场.
- 精确科学轨道 (PSO) 对于GOCE的重力场确定至关重要,但受到文物的影响.
- 2018年开始对GOCE1b级数据进行再处理,以解决这些缺陷,特别是梯度计数据.
研究的目的:
- 使用改进的方法重新计算GOCE的减少动态和动态公共服务义务.
- 在动力轨道和随后的重力场模型中减轻电离层诱导的工件.
- 评估再加工的PSO对静态和时间变化的重力场解决方案的影响.
主要方法:
- 采用精确的轨道确定方法,重点关注工件减轻,特别是对电离层效应.
- 重新计算的GOCE减少动态和动态公共服务条款.
- 在基于GPS的重力场测定中应用数据权重策略.
主要成果:
- 重新处理的PSO显示了与GPS数据 (8-9%) 的更好的一致性和减少轨道重叠 (31%).
- 显著改善了重力场系数 (10-40度),减少了电离层人工物.
- 与以前的GOCE基于GPS的重力场相比,地形高度差异减少了43%.
- 成功恢复长波长时间变化的重力信号 (高达10度).
结论:
- 再处理的GOCE PSO在轨道准确性和重力场建模方面提供了实质性的改进.
- 缓解电离层诱导的人工物对于高质量的重力场测定至关重要.
- 再处理的PSO能够恢复静态和时间可变的重力场信息.
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