Abstract: In order to resolve the danger of GPS to be jammed and turned off by other country in the special time, a new method of Unmanned Air Vehicle（UAV）'s navigation and automatic landing's guidance is proposed. When GPS is abnormal,the SINS begain to navigate, the infrared laser scan can search the airstrip, and the computer vision can guide the UAV's landing. The model and parameters of the infrared laser scan system, the design of the special reflector in the airstrip composed of reflective prisms and laser lamps, the computer vision algorithms for coordinate and direction of airstrip structured with the special reflector on the square or the highway,and the criterion of GPS on the rails are analyzed. The method of avoiding misguidance caused by others reflector and other infrared laser is made by the special reflector and special frequency laser. The results show that the new method is feasible in practice.

Key words: UAV, navigation, automatic landing's guidance, in