Application of GPS in Traffic

　　(1) Vehicle tracking

　　The actual position of the vehicle can be displayed in real time by using GPS and electronic map, and can be enlarged, reduced, restored and changed arbitrarily; It can move with the target to keep the target on the screen; It can also realize simultaneous tracking of multiple windows, multiple vehicles and multiple screens. This function can be used to track and transport important vehicles and goods.

　　(2) Provide travel route planning and navigation

　　Providing travel route planning is an important auxiliary function of automobile navigation system, which includes automatic route planning and manual route design. Automatic route planning is that the driver determines the starting point and destination, and the computer software automatically designs the best driving route according to requirements, including the calculation of the fastest route, the simplest route, and the route that passes through the expressway section with the least number of times. Manual route design is to automatically establish a route library by the driver according to his/her destination to design the starting point, ending point and passing point. After the route planning is completed, the display can display the design route on the electronic map, as well as the vehicle running path and method.

　　(3) Information query

　　Provide users with databases of main objects, such as tourist attractions, hotels, hospitals, etc. Users can display their locations on electronic maps. At the same time, the monitoring center can use the monitoring console to query the location of any target in the area, and the vehicle information will be displayed in digital form on the electronic map of the control center.

　　(4) Traffic command

　　The command center can monitor the running status of vehicles in the area and reasonably dispatch the monitored vehicles. The command center can also communicate with the tracked target at any time for management.

　　(5) Emergency assistance

　　The GPS positioning and monitoring management system can provide emergency assistance to vehicles in danger or accidents. The electronic map of the monitoring station displays the help seeking information and alarm targets, plans the optimal assistance scheme, and alerts the personnel on duty with sound and light of the alarm for emergency treatment.

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The following aspects mainly affect the performance of GPS antenna