Air-ground coordination traffic status perception and emergency commanding system construction

The time and place of traffic incident is unpredictable. It will seriously disturb the normal traffic if not dealt with in timely manner. The space-based traffic status perception and emergency commanding system was built, and its contribution principles were proposed. The system architecture was researched, which was divided into 4 layers, that is information acquisition layer, network layer, safety management layer and emergency command layer. Information acquisition layer mainly obtains the traffic information through a variety of ways such as ground or space-based foundation. Network transmission layer handles the store and forward of all types network communication packet. Safety management layer ensures the safety of system data and transport. Emergency commanding layer realizes unification receiving alarm, dealing alarm decision and coordinate command. The space-based information extraction about road contour feature and vector electronic map, and the matching between aerial images and electronic map were all realized. It laid a good foundation for identifying queuing length and vehicle density caused by an emergency situation.