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Receiver-transmitter for a target identification system

  • US 5,353,109 A
  • Filed: 03/26/1993
  • Issued: 10/04/1994
  • Est. Priority Date: 03/28/1992
  • Status: Expired due to Fees
First Claim
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1. A receiver-transmitter for a target identification system, includinglaser means for generating and focusing a laser beam for transmission to a reflective surface of a target to be identified;

  • collection means for collecting a reflected signal from the target and producing a collected signal having collected beams;

    an array of photodetectors, at least one of the photodetectors having the collected signal focused thereon;

    generation means, connected to an output of the laser means, for generating a frequency-shifted reference beam from the laser beam;

    beam division means for dividing the reference beam into a number of separate reference beams each having substantially equal power; and

    beam splitting means for causing each of the reference beams to be focused onto a separate one of the photodetectors of the array, the focusing of the collected signal onto the photodetector array being such that the reference and collected beams incident on the same photodetector are collinear.

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