The GPS satellite navigation system is mainly composed of three parts: space segment, control segment and user segment. The second-generation satellite navigation system in the United States uses the signals of four stars received at the same time to obtain the position, speed and time of the measured target, and at the same time it can be used by an unlimited number of users to achieve global navigation, positioning and timing around the clock. It has been widely used in military, nautical, aviation, public transportation and other fields by North America, Europe, Japan and other countries and regions.
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