Once the DF antenna fundamentals discussed above are understood, the basic principle of
the Watson-Watt DF technique is easy to understand. Essentially, the voltages produced by
the three co-located antennas discussed above are electronically processed in the DF
antenna and then sent to the DF receiver as a single composite signal. The DF receiver then
processes this signal in a fashion very similar to that of most any receiver, and then outputs
a demodulated version of the composite signal to the DF bearing processor.
The DF bearing processor then further demodulates this composite signal to recover two
voltages proportional to the X- and Y-axis voltages produced at the outputs of the bidirectional
antennas as discussed above. The recovered X-axis and Y-axis voltages are used
to compute the bearing (using an algorithm that examines the ratio of these two voltages).
The information obtained as a result of this computation is then sent to the bearing display.
The above-mentioned Watson-Watt DF system components are further discussed below
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