A: First, you need to understand how the GPS system works; The GPS positioning system has a total of 24 artificial satellites distributed in six operating orbits, each orbit at a 120 degree Angle, so that GPS users can receive satellite signals at any time and place to locate.

2, because it is outer space, the signal is generally run at the shortest distance between two points - a straight line, so 4g long standby asset tracker will be affected by weather, terrain, buildings, and it is difficult to receive GPS satellite signals indoors and in buses.

3. Weather. Bad weather, such as heavy rain, can seriously affect the satellite's signal, but it does not affect the positioning function.

4. Electromagnetic interference. Like a subway tunnel.

5, GPS jammer or GPS blocker.

6, car windshield, metal shield, heat insulation paper and so on. (Will reduce the satellite reception signal, but does not affect the positioning function)

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