Research of Angle Measurement Technique in Transponder Landing System

In t his paper , a spatial smoothing technique based on MUSIC algorithm is introduced to substitute the traditional phase interferometer angle measurement algorithm of Transponder Landing System (TLS). It m ainly researched the non-uniform linear receiving arrays design scheme under the new algorithm. This proposed algorithm aims to solve the multi-path or multi-targets interference problems of reply signal and eliminate the phase ambiguity caused by receiving arrays’ baseline. It contrasted the feasibility, validity, resolving power and precision of the designed arrays with the uniform arrays in the same condition through computer simulation. The effectiveness and advantage of the proposed algorithm include the usability and reliability of the designed arrays is theoretically investigated. At last, we can obtain the real-time azimuth and elevation information relative to the touchdown point of landing aircraft through c oordinate transformation.