Interpretation of global positioning system
Never that things like GPS changed human life, can you imagine life without a GPS context? Open GPS, satellites will lock your position in a few minutes, it will tell you the speed of the road, the location of the altitude…… All in all, in be accustomed to, do you think all these is behoove?
The global positioning system (GPS), first by America government and 70’s construction, predecessor is a specially designed for positioning system developed for the military, military considerations, in order to prevent the enemy through the positioning signal intercept American position, positioning system was set for a one-way transmission, i.e. GPS terminals only receive signals from the satellites instead of sending out signals the characteristics, but also lay a foundation for civil fields GPS.