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调查香港GNSS观测到的季节性地变形的表面负荷影响

Hongli Lv¹, Xiaoxing He², Shunqiang Hu^3,4

¹School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China.

Scientific reports

|January 21, 2025

概括

表面负荷效应,包括大气,水文和非潮海洋负荷 (AHNL),在GNSS时间序列中显著影响季节性振荡. 对AHNL的计算通过减少噪音和揭示关键周期信号来提高GNSS的准确性.

科学领域:

地质测量是指地质测量.
地球系统科学地球系统科学
地质物理监测地质物理监测

背景情况:

全球导航卫星系统 (GNSS) 时间序列中的季节性振荡受地表负载效应的影响.
了解这些影响对于提高GNSS准确性和数据解释至关重要.

研究的目的:

调查大气,水文和非潮海洋负荷 (AHNL) 对香港GNSS垂直时间序列季节性振荡的贡献.
量化AHNL对GNSS观测的影响,并评估信号分离方法.

主要方法:

来自香港9个站的每日垂直GNSS时间序列的分析.
对大气,水文和非潮海洋负荷 (AHNL) 变形的计算和相关性分析.
独立组件分析 (ICA) 和交叉波段转换 (XWT) 的应用,用于信号提取和相位关系分析.

主要成果:

在AHNL变形和GNSS垂直时间序列之间发现了显著的相关性 (平均系数为0.5),具有相同的振幅和相位.
消除AHNL变形使GNSS垂直时间序列的平方根平均值 (RMS) 平均减少了15%.
国际航空公司有效地分离了与AHNL相关的季节性信号 (Lin相关性>0.6),XWT证实了AHNL对年度振荡的主要贡献.

结论:

表面负荷,特别是AHNL,是香港GNSS观测季节性振荡的主要驱动因素.
对AHNL的计算对于提高GNSS测量的精度和理解非线性波动至关重要.
像ICA和XWT这样的先进信号处理技术在隔离和分析地理数据中负载效应方面是有效的.

关键词:

在 AHNL 找 AHNL 在GNSS中使用GNSS.美国国际航空公司 (ICA) ICA ICA 表面负荷的表面负荷.一个XWTXWTXWT

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