🚀 go-pugleaf

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


>-- 
>________________________________________________________________________
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> John Paul Morrison                     |  
> University of British Columbia, Canada |  
> Electrical Engineering                 |   .sig file without a cause
> jmorriso@ee.ubc.ca              VE7JPM |  
>________________________________________|_______________________________
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The spherical array of a BQQ-5 sonar system (submarine) consists
of well over 1000 seperate elements.  Its "quite" a system!