The positioning of the current location and the positioning of the target are two key technologies of the ground vehicle navigation system. The former requires GPS to obtain points, while the latter focuses on digital maps as the basis to determine the position of the point. This is actually a map -related analysis problem.

　　With the expansion of China's urban construction scale, the increasing number of vehicles, the management and reasonable scheduling of transportation, the command and safety management of police vehicles have become an important issue in public security and transportation systems. The emergence of GPS navigation positioning technology provides specific real -time positioning capabilities for the navigation positioning of vehicles, ships and other means of transportation. Mainly for public security and transportation systems are: command management systems combined with vehicle GPS positioning and radio communication systems; command management systems for GPS differential technology. GPS vehicle navigation applications are widely used, such as transportation line navigation, emergency vehicle navigation, vehicle dispatch, etc., such as smart vehicles and highway systems can be divided into 4 types based Consultation navigation system and census system. The team management system can operate multiple vehicles and has a cricket center; the consulting system integrates automatic automatic system and fleet management system; census systems are usually composed of automatic vehicle loading cameras or digital cameras, which can be used for Road information that obtains time and point characteristics,

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