Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 47, Issue 19, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL089647
Keywords
Global Navigation Satellite System; COVID-19; interferometric reflectometry; multipath signal
Categories
Funding
- German Federal Ministry of Education and Research (BMBF)
- Ministry of Culture and Science of the State of North Rhine-Westphalia (MKW) as part of the Excellence Strategy of the federal and state governments
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The ongoing coronavirus disease 2019 (COVID-19) pandemic has imposed tight mobility restrictions in urban areas, causing substantial reduction in roadway traffic. Many public parking lots are nearly vacant as people across the world have gone on lockdown since mid-March. This environmental change may have impacts on Global Navigation Satellite System (GNSS) sensors installed on roof of buildings. Here, we use a monitoring site in Boston to exemplify a likely sensitivity of precise GNSS sensors to their nearby dynamic environments including parked vehicles in parking lots. We show that reduced number of parked vehicles since 23 March has decreased the reflector roughness, resulting in an increase in the reflected signal power whose amplitude is quantified by GNSS interferometric reflectometry technique. The uncertainty of retrieved GNSS antenna height drops with beginning of lockdown, allowing more accurate estimate of reflector height, which could have a general implication for better understanding of the fundamental limitations of the technique.
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