Human migration-induced impacts on noise in GNSS position time series
Human migration-induced impacts on noise in GNSS position time series
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DOI：
10.1080/27669645.2022.2045698
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发表时间：
2022-12-31
期刊：
影响因子：
1.3
通讯作者：
Ding，Yihang
中科院分区：
文献类型：
--
作者：
Yao，Chaolong;Shum，C. K.;Ding，Yihang
The accuracy of (Global Navigation Satellite System) GNSS site coordinates is known have been impacted by human activities, especially for sites located in or near populated or urban areas. A better understanding of these human-originated noise sources would benefit GNSS research and applications. However, much less such studies have elucidated the error sources originated by human-induced environmental and mobility or migration effects, and their respective adverse impacts on GNSS positioning accuracy. Here we investigate the level of human originated noise reduction of GNSS site coordinate time series over mainland China during the ongoing coronavirus (COVID-19) pandemic from two main sources: the reductions of human-generated migration ground vibrations, and electromagnetic signal delays from the orbiting GNSS satellites to ground stations. We processed the GNSS height time series at selected 154 sites located in 110 cities in mainland China from 1 January 2017 to 25 March 2020, including the COVID-19 pandemic time period, to quantify the improved noise levels of GNSS displacement time series, and identified their correlations with the human migrations. We concluded the human-induced signal in continuous GNSS coordinate time series can be used as a real-time metric of regional human activity or migration intensity during COVID-19 episodes.
