Estimation of the directions of incident plane waves in case that the sound sources are complex pure tone

We have investigated about the estimation of direction of incidence of plane wave in case that the sound sources are complex pure tone like transformers. In this case, we show some difficulty in estimating of the error of angle of incidence of plane waves by reflection compared with the random noise signal. From the basic experiment to classify the pattern of characteristic of the error by reflection, we could confirm the influence of reflection theoretically, in the case of calculation, the measurement in the anechoic room, and the measurement out of doors.