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Remote sensing apparatus and a frequency analysis method of the remote sensing apparatus

  • US 7,161,733 B2
  • Filed: 03/02/2006
  • Issued: 01/09/2007
  • Est. Priority Date: 09/09/2004
  • Status: Active Grant
First Claim
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1. A remote sensing apparatus, comprising:

  • an optical system device which transmits laser light generated from a laser light source toward an optical pattern rotary plate being a measurement object to receive its reflection light by an optical receiver;

    a frequency converter which converts a reception signal obtained by the optical receiver into a signal in a frequency domain; and

    a frequency analyzer which analyzes a frequency component of the signal in the frequency domain obtained by the frequency converter, whereinthe frequency analyzer selects candidate values of sideband wave frequencies from the signal in the frequency domain, obtains an approximate value of a rotational frequency by decision of a majority of intervals of the sideband wave frequencies, obtains candidate values of a carrier frequency from the approximate value and selects the rotational frequency on the basis of the candidate values of the rotational frequency from among the candidate values of the carrier frequency.

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