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Internet Message Format  |  1992-11-17  |  966 b 
  1. Path: sparky!uunet!ogicse!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!haven.umd.edu!mimsy!inst-sun1.tmc.edu
  2. From: seth@inst-sun1.tmc.edu (Seth Chazanoff)
  3. Newsgroups: rec.guns
  4. Subject: Re: LASERs - rangefinders?
  5. Message-ID: <9211161901.AA05309@elroy.Jpl.Nasa.Gov>
  6. Date: 16 Nov 92 23:09:21 GMT
  7. Article-I.D.: elroy.9211161901.AA05309
  8. Sender: magnum@mimsy.umd.edu
  9. Organization: Jet Propulsion Laboratory, Pasadena, CA, USA
  10. Lines: 12
  11. Approved: gun-control@cs.umd.edu
  12.  
  13. Gary
  14.  
  15.     Re: RADAR/LASER range finding.
  16.  
  17.  Your point about timing is well taken, but what about if you send out a chirp,
  18. with the frequency increasing.  If you assume a stationary target, you can 
  19. look at the difference between the frequency you get back, and the frequency
  20. you are transmitting (beat them against each other).  If you know the rate
  21. that you are increasing the output frequency, you will know the round trip 
  22. time.  Of course this would only work for a RADAR, not a Laser.
  23.  
  24.                 Seth
  25.