A direction of arrival (DOA) finding method in passive radar is proposed based on amplitude comparison of signals between different beams.By the use of an 8-element uniform circular array

18 beams covering the whole space for targets surveillance are formed based on beam pattern synthesis technique.On the process of beam scanning

clutter cancellation and match filtering

DOA is estimated on the range-doppler map.Performance of the original method is analyzed when reference signal is contaminated by target echoes

where the performance of the original method degrades rapidly.An improved method is proposed for the case when reference signal is contaminated by target echoes.Experiments show that the improved method well outperforms the original method when reference signal is contaminated by target echoes.