gps vehicle tracker.Satellite TV signal and GPS locator satellite system difference

　　In the streets of the city, on the roofs of rural farmhouses, we can often see large and small "POTS". Do not underestimate these "POTS", the local people watch TV on it, it is actually an antenna, used to receive satellite TV signals. However, the same is to receive satellite signals, mobile phones and GPS locator why do not need this "pot"?

　　The principle of the GPS positioning satellite system is as follows: it obtains the distance between the receiver and the satellite by measuring the round-trip time between the receiver and the satellite that has been clearly located, and then obtains the accurate position of the receiver through the data of 4 or more satellites for positioning and navigation. Because satellite TV signals are transmitted by specific and geosynchronous satellites, and far from the Earth, the transmission of data is more complicated, so TV users need to "pot" to get enough signal to make the TV picture clear output. The GPS satellite is closer to the Earth, and the transmission of data is simple, so there is no need to use "pot".

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