home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.electronics
- Path: sparky!uunet!mnemosyne.cs.du.edu!nyx!ghuntres
- From: ghuntres@nyx.cs.du.edu (Gary huntress)
- Subject: Re: Phased sonar
- Message-ID: <1993Jan11.165502.27120@mnemosyne.cs.du.edu>
- Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
- Organization: University of Denver, Dept. of Math & Comp. Sci.
- References: <1993Jan10.104636.5690@doug.cae.wisc.edu> <1993Jan11.025137.5
- Date: Mon, 11 Jan 93 16:55:02 GMT
- Lines: 52
-
- jmorriso@ee.ubc.ca (John Paul Morrison) writes:
-
- >In article <1993Jan10.104636.5690@doug.cae.wisc.edu> kolstad@cae.wisc.ed
- (Joel Kolstad) writes:
- >>
- >>Hi,
- >>
- >> I've been told, by those who ought to know, that you can take 3 or
- >>more sonar transponders, send out a pulse, and then watch what happens
- o
- >>all three of them on the return trip to get an entire effective 360 deg
-
- >>sweep of whatever you're looking at. Supposedly almost as good as havi
- g
- >>one rotating transponder, but no more need to rotate -- neat.
-
- >'supposedly almost as good' ... grumble...
- >>
- >> So... could someone give me a reference to where I could read all
- >>the details about how this is done? Or, if it ought to be glaringly
- >>obvious and simple, explain how it's done?
-
- >I would imagine that a phased sonar works on the same basic principles
- >as a phased array radar. (just using different kinds of waves)
-
- >The 3 transponders are like 3 antennas. Send pulses into the transponder
-
- >with different phase angles, and the outputs add and substract in nifty
- >patterns. The outputs interfere, cancelling out, or add, making the outp
- t
- >focused in a certain direction.
-
- >WIth nifty control electronics, who needs a spinning transponder/antenna
-
- >>
- >> Thanks.
- >>
- >> ---Joel Kolstad
-
-
- >--
- >________________________________________________________________________
- _
- > John Paul Morrison |
- > University of British Columbia, Canada |
- > Electrical Engineering | .sig file without a cause
- > jmorriso@ee.ubc.ca VE7JPM |
- >________________________________________|_______________________________
- _
- The spherical array of a BQQ-5 sonar system (submarine) consists
- of well over 1000 seperate elements. Its "quite" a system!
-
-