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In most implementations, two signals are formed, one being the sum of the two beams, and the other being the difference of the two beams. The ratio of these two beams normalises the difference signal and allows the direction of arrival of the signal to be calculated. The shape of the antenna beams
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Two overlapping antenna beams are formed, which are steered in slightly different directions, usually such that they overlap at the
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must be known exactly and hence the accuracy of the techniques can be affected by unwanted multipath reflections.
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