A GPS system helped my aunt and I return safely back to Texas on the right roads the next couple of days. Many people in America and all over the world today use GPS Systems in their vehicles, boats, or handheld devices to help them get safely to their destinations. This is one of the many examples of why global positioning systems exist and are helpful to society today. The thought for global positioning systems originated from the use of networked ground-based radio navigation systems. In 1957, United States scientist started to track the launch of Russia’s spacecraft Sputnik, which was the first artificial satellite that orbited Earth. Within time scientist observed that the frequency of the radio signal that was transferred by the Russian satellite, Sputnik increased as the satellite neared and lesser as it moved away from Earth, this all happening because of the Doppler Effect. The Doppler Effect is the change in a frequency of a wave concurring to the relative movement of the source of the wave and the observer. Today the United States have a network of U.S. Satellites in space called, Navstar. They provide global positioning systems (GPS) services, with at least 24 satellites in orbit, which both military and civilians use for navigation. There
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