The traditional bearing measurement method for TACAN equipment has the problems of large error and weak anti-jamming performance. An accurate measurement method was put forward according to the characteristics of TACAN impulse signal, which implemented angle measurement based on sinusoidal curve fitting. Measurement error of traditional method and the accurate measurement method was calculated out. The signal’s quality factor which can confirm the reliability of the measurement value was defined. Simulations were carried out under different SNRs to compare the performance of the traditional method and the new method, and to analyze the variation of quality factor when the signal had a distortion. The result proved that the new method greatly improves the measurement precision and anti-jamming performance, and the quality factor better reflects the signal’s distortion.