XPost: rec.arts.sf.written, rec.arts.sf.science   
      
   In rec.arts.sf.science J. Clarke  wrote:   
   > In article , robban@clubtelco.com   
   > says...   
      
   >> But if every car were using that, wouldn't there be some interference?   
   >   
   > Most likely they use encoded signals so that each car can distinguish   
   > its own returns from those of others.   
   >   
      
   And if they use directional transmission/reception, circular   
   polarization and a precise direction, time and location encoded in the signal,   
   you can use other cars' signals to determine 1) their location 2) path   
   their signal took to get to your car, and thus obstacles in the   
   surroundings.   
   Very hi-tech, but doable - if not today, then in a few years.   
      
      
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