Figure 1-16. Angle of arrival.
As with the bar antenna, however, a possibility of bidirectional ambiguity exists with time of
arrival measurements if the wavefront strikes both antennas at the same time. (See Figure 1-
To resolve this ambiguity, at least one more antenna is added to form one or more added
baselines. (See Figure 1-18).
If a wavefront strikes antennas 1 and 2 at the same time, the ambiguity is resolved by
measuring the time difference of arrival of the wavefront at antenna 3.