Figure 1-14. Combination of sense and directional antennas.
With the continual development of minicomputers and microprocessors, other methods of
direction finding have become feasible. One common method of azimuth determination is
Time of Arrival measurements. For this measurement, at least two antennas are used to form
an antenna baseline. (See Figure 1-15).
Figure 1-15. Antenna baseline.
As the wavefront strikes each antenna, a microprocessor measures the difference in the time
of arrival at each antenna, and the angle of arrival is determined. (See Figure 1-16).
1-15
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