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Originally Posted by desertisland
This is fun. Let me indulge myself a little more. A model for the towed array:
Ask 10 school boys to stand in a row, each 5 meters apart and carries a flag in hand.
Tell the boys to raise the flag if they feel the wind against their cheeks.
By the time lag between each raised flag, and the sequence in which they are raised, we could determined the direction of the wind. But we would get 2 possible solutions since the boys are not asked to tell which cheek is feeling the wind.
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Well this could work only if you new speed of the wind
But generally that's it.
Well in fact it is done in slightly different way. Signals are summed with preset delay which amplifies signals from specific direction. It's called 'array steering' or 'beam-forging'. For BB display many such virtual beams are forged all the time, each for one bearing. It really takes a lot of math to simply see 'ah, there is something loud on bearing 030'
Edit: I should quit smoking ..