What are the main functions of car GPS?

GPS is the U.S. development of the "global positioning system", the role of the receiver to receive signals from satellites, to determine what position on the earth. The GPS navigator is based on GPS signals to guide the user to reach the destination of a vehicle device. Electronic dog is a kind of anti-speed radar on-board device, the role is to remind the owner in advance of the existence of electronic eye or speed radar, can prevent because of speeding or violation of fines and demerit points. GPS navigator is used to play a role in path guidance, even if it can be alarmed by the speed radar camera is generally fixed to a certain coordinate near the prompt, even if the camera is removed, if the map does not update is still will be reported. Electronic dog is used to identify the radar speed special equipment, according to the radar signal or not, remind the user of the radar speed, electronic dog itself is no navigation function.　GPS vehicle tracking system is divided into three categories: anti-theft alarm (including emergency rescue and medical help), scheduling command and fleet management (logistics and transportation).GPS vehicle tracking system integrates the use of GPS technology, modern communication technology and geographic information technology (GIS). Using GPS technology, the GPS receiver in the GPS vehicle terminal receives and processes the GPS constellation signal to locate the vehicle and get the vehicle information, including the vehicle's dynamic coordinate position (longitude, latitude and altitude), time, status, etc. The GPS vehicle terminal generally adopts the DGPS technology, i.e., the differential GPS technology, to improve the accuracy of the vehicle positioning. The GPS receiver of the GPS vehicle terminal receives a vehicle positioning information, the fixed GPS receiver of the monitoring center receives a monitoring center positioning information, the monitoring center positioning information is transmitted to the GPS vehicle terminal through the wireless communication link, and the GPS vehicle terminal comprehensively analyzes the positioning information received by its own GPS receiver and the positioning information of the monitoring center received through the wireless communication link, and then derives the precise positioning information of the vehicle.

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