Gps speed limiter.What is GNSS

　　The full name of GNSS is Global Navigation Satellite System (GNSS), which refers to a single satellite navigation and positioning system such as the Beidou system, GPS, GLONASS, Galileo system, etc. It can also refer to their enhanced systems, or to the sum of all these satellite navigation and positioning systems and their enhanced systems, That is to say, it is a large system composed of multiple satellite navigation and positioning systems and their enhanced systems. GNSS is a star rated radio navigation system that uses artificial satellites as navigation stations, providing all-weather, high-precision position, speed, and time information for various military and civilian carriers worldwide, including land, sea, air, and space. It is also known as a space-based positioning, navigation, and timing system.

　　The international GNSS system is a multi system, multi GPS positioning system. The working principle is that the ground control station collects observation data and meteorological information from various monitoring stations, calculates the ephemeris and satellite clock corrections of each satellite, edits navigation messages in the prescribed format, and injects this information into GPS satellites through injection stations on the ground. During measurement and positioning, users can use the stored ephemeris of the receiver to obtain rough positions of each satellite. Based on these data and their own positions, the computer selects four satellites with a larger angle between the satellite and the user's line as observation objects.

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