GPS is the main system is very much ill-old US-run satellite launch system, contains 27 to continue to send location and time of the altitude of the satellite signal, 24 normal use, three back-up, the average distribution of these satellites orbit in six runs . Generally speaking, on the ground of the GPS receiver can receive 5 to 12 satellite signals, while on the ground in order to obtain location coordinates, GPS navigation needs at least four satellite signals, the three GPS receivers used to determine latitude, longitude and altitude, the fourth time to provide simultaneous correction

电子工程师必备手册gps.pdf

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