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RADAR APPARATUS AND METHOD OF DETERMINING SIGN OF VELOCITY

  • US 20150185244A1
  • Filed: 12/23/2014
  • Published: 07/02/2015
  • Est. Priority Date: 12/26/2013
  • Status: Active Grant
First Claim
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1. A radar apparatus which radiates laser light toward an object and detects and analyzes the laser light reflected by the object, comprising:

  • detector which includes first detector for mixing received laser light and pre-transmission laser light so as to perform optical heterodyne detection, and second detector for shifting the phase of one of the received laser light and the pre-transmission laser light by 90° and

    mixing the phase-shifted one laser light with the other laser light so as to perform optical heterodyne detection; and

    frequency analyzer for producing a complex signal while using electric signals output from the first detector and the second detector as an I component signal and a Q component signal, obtaining a Doppler frequency fd through frequency analysis of the complex signal, and determining the sign of velocity of the object from the sign of the Doppler frequency fd.

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