Analysis on Transponder Landing System Angle Measurement Error

Transponder landing system is a transponder-based precise approach landing system.It adopts phase interferometer principle to obtain the azimuth and elevation information.This paper introduces the basic principle of angle measurement,analyzes the accuracy and error source about the angle measurement of this system.The phase error caused by the receiving channel unbalance and the phase ambiguity of multi-baseline interferometer is analyzed especially.Aiming to each characteristic,this paper puts forward the method to solve the receiving channel unbalance and the phase ambiguity under the condition of noise.The correctness of the theory analysis was demonstrated by computer simulation.