The GPS system is a malicious and unpredictable satellite system, which contains 27 continuous altitude and time signals The satellites, 24 normal USES, three spare, the satellites run on six orbits on average. Generally speaking, GPS on the ground The receiver can receive 5 ~ 12 satellite signals, and in order to obtain the location coordinates on the ground, GPS navigation requires at least 4 satellite signals, three of which are used To determine the latitude, longitude and altitude of the GPS receiver, the fourth provides synchronization correction time. The global positioning system is made up of three parts: the space satellite part: the 24 orbiting satellites, which are divided into six orbits and run around 20,200 kilometers into orbit around earth About 12 hours. Each satellite continues to launch radio waves that carry satellite orbital data and time, providing a variety of receivers on earth To use.

GPSdesign.pdf

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