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The paper explores the shadows created by moving humans in two types of Forward Scatter (FS) systems, which use GPS signals and sound signals. The comparative analysis of results is based on the correlation analysis and focused on establishing of relationships between different types of shadows. The results show whether it is possible to use sound barriers for detection of moving objects.
Recently more attention has been paid to the space debris orbiting the Earth. Until 5 July 2016, the United States Strategic Command tracked a total of 17 729 artificial objects including 1419 operational satellites[1]. Information about the current position of these objects should be taken into consideration while planning space missions. There are various solutions to cope with the problem considered...
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