Principles of GPS system positioning.Magnetic gps tracker company.gps tracker for Car supplier

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????The basic principle of GPS positioning is to use the instantaneous position of high-speed moving satellites as known starting data, and use the method of spatial distance resection to determine the position of the test point.

????Assuming that a GPS receiver is placed at the ground test point at time t, the time ? t of the GPS signal reaching the receiver can be determined. In addition, the satellite ephemeris and other data received by the receiver can determine the following four equations:

????The meanings of each parameter in the four equations are as follows:

????x. Y and z are the spatial Cartesian coordinates of the coordinates of the point to be measured.

????Vto is the clock deviation of the receiver.

????C is the propagation speed of GPS signals, that is, the speed of light.

????Di (i=1, 2, 3, 4) is the distance between satellite 1, satellite 2, satellite 3, and satellite 4 to the receiver.

????? ti (i=1, 2, 3, 4) is the time it takes for signals from satellites 1, 2, 3, and 4 to reach the receiver.

????Di=c ? ti (i=1, 2, 3, 4)

????Xi, yi, zi (i=1, 2, 3, 4) are the spatial Cartesian coordinates of satellite 1, satellite 2, satellite 3, and satellite 4 at time t, obtained from satellite navigation messages.

????Vti (i=1, 2, 3, 4) is the clock deviation of satellite clocks for satellites 1, 2, 3, and 4, provided by the satellite ephemeris.

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