Abstract:

In complex geographical environments such as uncertain area，hostile environment and restricted area on the battlefield，conducting the search and rescue operation for persons in distress faces numerous challenges including low efficiency and poor positioning accuracy.How to utilize emerging equipment such as unmanned aerial vehicles （UAVs） to improve the efficiency of search and rescue operations for the persons in distress has become a research hotspot across the world.A searching and positioning UAV micro-swarm system composed of three multi-rotor UAVs is designed.This system is mainly composed of quadcopter UAVs，electro-optical search payloads，broadband ad hoc network radios，and UAV ground stations，etc.The day and night search and collaboration control are realized by single UAV and muliti-UAV collaboration.The miniaturized design of UAV makes it easy for the operator to carry with a backpack，facilitating forward reconnaissance to determine the locations information and the condition of the injury.The system can precisely locate the persons in distress and has the advantages of being less restricted by terrain and environment and having high search efficiency in the area.UAVs can achieve multi-mode networking communication among multiple unmanned platforms，and the ground control station has the functions of mission planning，setting the mission routes for multiple UAVs，and controlling UAVs to fly in formation，which can enhance the efficiency of battlefield search and rescue through the multi-UAVs collaboration.

Key words: searching and positioning, unmanned aerial vehicle, person in distress, multi-UAVs collaboration