In recent years, low and slow minor events have increased significantly. The development of low and slow small UAVs (drone threat) poses an increasingly significant threat to priority targets, priority areas and major activities. Especially in the current severe anti-terrorism situation, once it is used by people with ulterior motives or hostile elements, it will cause immeasurable losses and consequences.

　　Low and slow small aircraft cover a wide range of areas (including small and medium-sized aircraft, helicopters, gliders, delta wings, paragliders, powered umbrellas, hot air balloons, airships, drones, aviation models, air balls and other general aviation equipment and aviation sports equipment.) Due to the development of science and technology and the characteristics of low-speed small drones themselves - low cost, simple operation, easy to carry, easy to obtain, low takeoff requirements, strong takeoff surprise, difficult to find and handle. With the gradual opening of low-altitude airspace control and the rapid development of low-slow small UAV technology, the cases of illegal flight and terrorist attacks of low-slow small UAV are increasing day by day. Reports about illegal surveying and mapping of low-speed small drones, close investigations, and disrupting normal aviation order frequently appear in the report, causing huge negative impacts and economic losses, and seriously affecting national security and the normal development of the national economy.

　　The impact of low and slow small UAVs on the existing security system makes the existing technical prevention system, physical barrier, detection, alarm, access control and other prevention systems based on preventing land intrusion powerless in the face of the threat of low and slow small UAVs. The traditional key targets, key areas of civil air defense, physical defense, and technical defense modes are severely challenged by the threat of low and slow small UAVs.