The composition of GPS system

　　GPS navigation system is a radio navigation and positioning system based on 24 positioning artificial satellites in the world, which provides three-dimensional position, three-dimensional speed and other information to all parts of the world all-weather. It consists of three parts, one is the ground control part, which consists of the main control station, the ground antenna, the indiscriminate measurement station and the communication auxiliary system. The second is the space part, which consists of 24 satellites distributed in 6 orbital planes. The third part is the user device, which consists of a GPS receiver and a satellite antenna. Now civilian positioning accuracy can reach within 10 meters.

　　●Navigation function: The driver selects the starting point and end point of the driving route on the vehicle GPS navigation system, and the navigation system provides the optimal driving route according to the current location and traffic conditions

　　●Electronic map: covering all major cities in the country and local road information, and even the traffic of the destination city at any time.

　　●Steering voice prompt function: If you encounter an intersection or turn ahead, the system will remind the driver in advance by voice.

　　●Location function: GPS can accurately determine its location by receiving satellite signals, and the error is within 10 meters.

　　●Safety reminder function: Built-in road safety attribute information (such as traffic lights, over/speed limit sections, accident dangerous areas, etc.), the navigator will promptly remind the driver of the safety attribute information of the road section ahead in the form of voice and graphs to avoid violating traffic rules. Effectively prevent traffic accidents.

　　●Display track: Record the route that the vehicle travels through effectively and in real time.

　　Anti-theft function: static anti-theft and dynamic tracking, the former of static anti-theft means that when the owner leaves the car and the parked vehicle is stolen, destroyed or moved, the vehicle sends an alarm to the GPS monitoring center through its own monitoring system, and automatically communicates with the owner's mobile phone. Contact, call the police, etc. Dynamic tracking means that it can track the location of stolen vehicles in motion, monitor vehicle conditions, record vehicle tracks, and even control vehicle power outages and fuel cuts.

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A - GPS positioning