In addition to GPS for navigation, positioning and measurement, since the precise clock on the space satellite of the GPS system can release time and frequency information, based on the precise clock on the space satellite, under the monitoring of the ground monitoring station, transmission Precise time and frequency is another important application of GPS, which can be used to control precise time or frequency and serve many engineering experiments. In addition, GPS can also be used to obtain meteorological data for some experimental and engineering applications.

　　The global satellite positioning system GPS is one of the most innovative high-tech developed this year. Its global, omnipotent, all-weather navigation and positioning, timing, and speed measurement advantages will inevitably be more and more widely used in many fields. Applications. In developed countries, GPS technology has been applied to transportation and traffic engineering. At present, the application of GPS technology in China's road engineering and traffic management has just started. With the development of China's economy, the rapid construction of high-grade highways and the gradual deepening of the application of GPS technology, its application in road engineering will also be Broader and deeper, and play a bigger role.

　　Data interface format: This needs to be discussed in detail. GPS can output real-time positioning data for other devices to use, which involves a data exchange protocol. Almost all GPS receivers now follow the standard specification specified by the National Marine Electronics Association, which establishes the communication standard between all marine electronic instruments, including the format of transmission data and the communication of transmission data. protocol. There are three types of NMEA protocols: 0180, 0182 and 0183. 0183 can be considered as a superset of the first two and is now widely used. 0183 has several versions, V1.5 V2.1. Therefore, if your GPS receiver is to be connected to a common GPS navigation program in your notebook, such as OZIEXPLORER and my GPSRECEIVER, you should choose the protocol above NEMA V2.0. The communication speed specified by NMEA is 4800 b/S. There are now receivers that offer higher speeds too, but honestly it's not much use, 4800 is more than enough.

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