The airport site environmental influence is one important factor to reduce the navigation precision of the microwave landing system (MLS). According to the technology system and navigation principle of MLS, the scheme of hardware-in-the-loop simulation of MLS based on scale model with large scale factor was put forward. We used the controllable laser transmitting equipment to simulate the function of the angle navigation antenna of the MLS, radiating well directional laser scanning beam. According to the electromagnetic similitude theory, we set up the scale model of the environment of an airport, and used the propagation of the laser in the scale model of the airport to simulate the real propagation situation of the navigation signal transmitted by the MLS. The feasibility of this simulation system was analyzed thoroughly. The critical technologies of this system had been researched. At last, the scale model of one real airport was set up; the scale model simulation was conducted. The simulation results indicated the validity of the scale model simulation system of MLS.
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