Gps speed limiter.What is GPS satellite positioning?

　　1. There are two types of positioning methods: static measurement and dynamic measurement, also known as differential measurement, which can be divided into real-time differential and post-processing differential. However, real-time differential is more commonly used and can quickly obtain the three-dimensional coordinates of the positioning point.

　　2. For static measurement, it is the simultaneous use of several GPS for long-term observation, which can be determined according to engineering needs. Then, the observed data is solved and adjusted using software to obtain high-precision three-dimensional positioning coordinates.

　　3. For dynamic measurement, one or more GPS receivers are used as reference stations, while others are used as mobile stations. The reference station receives signals from satellites and sends differential data to the mobile station in the form of a data link. The mobile station receives differential signals from the reference station while receiving satellite signals, performs real-time differential, and obtains three-dimensional coordinate information of the positioning point. The application of GPS in road engineering is mainly used to establish various road engineering control networks and measure aerial survey external control points.

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