The general recognition of GPS is to use it as navigation, so what is navigation? Navigation is defined as "the science of getting a vehicle or person from one place to another". In our daily life, we are exposed to the concept of navigation all the time, from our commuting to get off work to taking transportation, whether it is our experience or the stop sign of a station, if there is no concept of "navigation" in it, then we Can't get from one place to another.

　　Navigation services using large systems did not actually start with GPS systems. To put it simply, we can divide the devices of the navigation system into two types: land-based and satellite-based. The former navigation system device is designed on land, and the device with higher operating frequency has high positioning accuracy but will be subject to "line of sight" (obscuring objects). ), and the device with lower operating frequency has lower positioning accuracy, so it is generally suitable for positioning objects with low dynamics (low moving speed).

　　The GPS system has been conceived in the 1960s, and the meridian system was built in 1964, which is suitable for low dynamic objects. After the gradual improvement and modification of the satellite navigation technology, the GPS system was born.

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