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I have recently started studying array signal processing. I am struggling to understand the intuition behind ambiguity of direction using a single linear array and how it is solved using two parallel linear arrays. Can anyone please explain me?

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  • \$\begingroup\$ With two arrays you can use differential processing to give you more accurate results. Common mode reflections can be cancelled out, etc. Doppler effects such as motion become more clear. \$\endgroup\$ – Sparky256 Mar 14 at 22:59
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Consider a linear array of sensors aligned in a North-South direction. This array cannot distinguish between a signal arriving from the East versus a signal arriving from the West. Either signal will arrive at all of the sensors at the same time. Now consider what happens if there are two parallel arrays designated A and B with array A to the West of array B. A signal arriving from the East will reach the sensors in array B before the sensors in array A. Similarly a signal arriving from the West will reach the sensors in array A before those in array B. Thus the directional ambiguity no longer exists.

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