🚀 go-pugleaf

In article <1993Jan10.104636.5690@doug.cae.wisc.edu> kolstad@cae.wisc.edu (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 to
>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 having
>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 transponders
with different phase angles, and the outputs add and substract in nifty
patterns. The outputs interfere, cancelling out, or add, making the output
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 |  
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