Subject:
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Re: Sonar question
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Wed, 20 Oct 2004 21:50:27 GMT
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Viewed:
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1508 times
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In lugnet.off-topic.geek, David Laswell wrote:
> In lugnet.build.military, Dave Schuler wrote:
> > Can sonar "see" around objects? Can it detect, for example, a sub hiding on
> > the other side of a reef or similar underwater obstacle? • ***snip***
> The only way to get accurate readings around objects would be to use some sort
> of stereo-sonar, and since sonar systems mounted at opposite ends of a ship
> would be effectively receiving the same readings from objects located on or near
> their shared axis, you'd need a minimum of three sonar systems (using different
> frequencies or coded signals for active sonar so they don't get confused with
> each other) in a non-linear layout that are able to receive a return signal from
> a given object, so you'd probably need to have a large number of them all over
> the ship, and a powerful computer to interpret the various signals into one
> combined readout.
Good info--thanks. It started out as an idle curiosity, but then I really got
to wondering about it.
> > I plan to put sonar on all my spaceships, so I'm eager to learn of its
> > limitations.
>
> Well, the most significant limitation in this instance is that sonar, being
> sound-based, doesn't work at all in a vacuum.
That's what I get for leaving out the 8^)
You'll probably poo-poo my plan to install a screen door on the airlock, too.
Dave!
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Message is in Reply To:
 | | Re: Sonar question
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| (...) Only if there are sufficient holes in the obstacle to allow the sonar to read objects through them. You should be able to read another object through a chain-link fence, but not a privacy fence with overlapping boards. (...) Sound waves bounce (...) (20 years ago, 20-Oct-04, to lugnet.off-topic.geek)
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