Coordinate Transformation Algorithm of UAV Microwave Takeoff and Landing System

In order to obtain real-time and precise airplane position relative to the touchdown point,a rotational coordinate iterative algorithm based on coordinate rotation is presented to solve the measurement equations.Through rotating coordinates,the displacement on the vertical axis is eliminated in this algorithm.Then,the concrete iterative process based on the traditional algorithm is achieved.The coordinate transformation model is established.The proposed method is applied to simulating the coordinate transform in the specific airport environment.What is more,the results are compared with the calculation results from the traditional algorithm.The comparison between them shows that the use of the rotational coordinate iterative algorithm can effectively improve the limitation and deficiency of the traditional algorithm in the convergent speed and accuracy.Moreover,the new algorithm is of practical value in acquiring more accurate and real-time guide information.