Abstract:

In order to analyze and compute the multi-path efects on angle error of microwave landing system (MLS), a new numerical method based on the geometric optical and ray-tracing theory is proposed. In the new method, through the geometric optical and geometric diffraction theory, the signal level ratio of multi-path signal relative to direct signal can be effectively acquired. And through ray-tracing theory, the phase displacement can be computed to achieve the angle error pattern. Through the simulation, the angle error pattern is devided into in-beam region and out-of-beam regions. It is found that the in-beam error is key point of angle error. The new method is applied to simulate the multi-path scenario in an airport. And the results are compared with results of the experience methods to validate its feasibility.

Key words: control and navigation technology of aerocraft, microwave landing system, multi-path effect, angle error, numerical simulation