![]() South Campus Dr., Salt Lake City, UT 84112. ![]() Continuing Education at the University of Utah. how to use dampyo calculator liberty university. Karegar and Jürgen Kusche: Imprints of COVID-19 lockdown on GNSS observations: An initial demonstration using GNSS interferometric reflectometry, Geophysical Research Letters DOI: 10.Coolmathgamwa Extreme pamplona cool math games powmr 5000w hybrid inverter manual. "Our study recommends that we should try to avoid installation of GNNS sensors next to parking lots." "Precise GNSS sensors are often installed in urban areas to support positioning services for engineering and surveying applications, and eventually for scientific applications such as deformation studies and natural hazards assessment," says Karegar. In the past, GNSS stations were preferably installed in sparsely populated regions, but this has changed in recent years. "During the lockdown, however, there were almost no vehicles parked in the vicinity of the antenna this improved the accuracy to about two centimeters." A decisive leap: The more reliable the values, the smaller the elevation fluctuations that can be detected in the upper soil layers. "Before the pandemic, measurements of antenna height had an average accuracy of about four centimeters due to the higher level of noise," says Karegar. This not only reduces the signal intensity, but also the information that can be extracted from it: It's "noisy." In addition, because the "pattern" of parked cars changes from day to day, these data can not be easily corrected. In their analysis, the researchers were able to show that parked cars significantly reduce the quality of the elevation data: Parked vehicles scatter the satellite signal and cause it to be reflected several times before it reaches the antenna, like a cracked mirror. "And they are often surrounded by large parking lots - as is the case with the antenna we investigated in Boston." "But many GNSS receivers are mounted on buildings in cities or in industrial zones," explains Prof. This method works well if the surrounding ground is flat, like the surface of a mirror. To calculate the risk of flooding in low-elevation coastal areas, it is important to know this change - and thus the subsidence of the Earth surface - precisely. The can be used to calculate the distance between the antenna and the ground surface which can change over time. When superimposed on the directly received signal, it forms certain patterns called interference. This reflected part therefore travels a longer path to the antenna. Part of the signal is reflected by the nearby environment and objects and reaches the GNSS antenna with some delays. The measuring method is based on the fact that the antenna does not only pick up the direct satellite signal. Researchers, for instance, can measure the wave-like propagation of an earthquake and the rise or fall of a coastal area. Makan Karegar from the Institute of Geodesy and Geoinformation at the University of Bonn. "This has recently allowed our research group to measure elevation changes in the uppermost of soil layers, without installing additional equipment," explains Dr. For some years now, it has also been possible to measure the distance between the antenna and the ground surface using a new method. They do this using the US GPS satellites and their Russian counterparts, GLONASS. GNSS receivers can determine their positions to an accuracy of a few mm. The study, which was carried out by geodesists from the University of Bonn, investigated the location of a precise GNSS antenna in Boston (Massachusetts) as an example. At least that is what the study now published in the Geophysical Research Letters shows. Geodesy, a branch of the Earth Science to study Earth's gravity field and its shape, on the other hand, has benefited from the drastic reduction in human activity. Many of those affected by the lockdown suffered negative economic and social consequences. The journal Geophysical Research Letters now reports on this.Ī number of countries went into politically decreed late hibernation at the onset of the Covid-19 pandemic. ![]() More precise geodetic data are important for assessing flood risks and for improving earthquake early warning systems. The results show which factors should be considered in the future when installing GPS antennas. A study by the University of Bonn now shows that the quality of these measurements may have improved significantly during the pandemic, at least at some stations. view moreĮmerging use of Global Navigation Satellite System (GNSS) makes it possible to continuously measure shallow changes in elevation of Earth surface. Image: The parking lot at a supermarket in Boston where the measurements were taken.
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