GPS is a global positioning system that can be applied for navigation where location determination and tracking is required across the globe any where any time. Also precision timing can be produced by the signal of the GPS.
One of the main applications is the timing in the wide area communication networks. So, it is is used for synchronization and timing in large area long distance digital communication systems.
There are many emerging applications for space applications, health applications,
industrial applications, traffic control and autopilots. There are also emerging applications in the agriculture field.
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More GPS applications concern climate change and environment, as the modelisation of water vapour in the atmosphere
Besides GPS, there are three other systems, i.e. GLONASS, Galileo and BeiDou. Together they were called GNSS. The reflection GNSS signal can also be used to retrive the parameters of the sea and land. The positioning results given by GNSS can also be used as a tool of deformation monitoring.
The Global Navigation Satellite System (GNSS) has been used to study the space weather. One of the big challenge is related to ionospheric scintillation. See e.g. http://www2.inpe.br/climaespacial/portal/tec-map-home/
There are others applications as aquifer deformation monitoring by GPS, see http://geodesy.unr.edu.
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