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Originally Posted by LuftWolf
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There's ARC-Is planned for a long time into the future.
I think that all the big future advances in sonar technology are going to come from fancy computers processing the signal. For decades scientists and engineers have thinking of ways of extracting every little bit of energy out of the water and turning it into a signal. Now... they're right up against the physical limits of how much energy is there TO extract. So... what you're left with is inventing clever ways of looking at noise and finding patterns.
It's sort of like trying to find the remnents of The Big Bang by watching fuzz on your television. Everyone knows it's there, but you need to be really clever to tell which piece of fuzz is the one you're curious about.