Landing condition analysis of a loss-of-thrust UAV based on adjoint method

A loss-of-thrust UAV (unmanned aerial vehicle) needs to land to a predetermined area, which not only requires a higher accuracy of landing area, but also needs to maintain a certain attitude angle. In this paper, the Schwartz inequality and state space form are used to derive the guidance law with angle constraint. The influence of heading error and angle constraint on aircraft landing area are analyzed quantitatively based on the adjoint method. The simulations show the range of the heading error and angle constraint on the condition of certain miss distance. Compared with traditional Monte-Carlo method, the method of adjoint in this paper has the advantages of small computation and simple data processing.