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Radar

  • US 7,138,939 B2
  • Filed: 01/06/2005
  • Issued: 11/21/2006
  • Est. Priority Date: 01/09/2004
  • Status: Active Grant
First Claim
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1. A radar comprising:

  • a transmission section that switches between a first frequency and a second frequency to transmit a transmission wave having one of the first frequency and the second frequency;

    a predetermined schedule generated on a basis of a pseudo noise code;

    a switch period between the first frequency and the second frequency in the transmission wave equal to or larger than a period determined by a code length of the pseudo noise code;

    a reception section that receives a reflected wave of the transmission wave transmitted by the transmission section;

    a transmission switch section that switches between turning-on and turning-off of an operation of the transmission section at the predetermined schedule;

    a delay section that delays the predetermined schedule;

    a reception switching section that switches between turning-on and turning-off of an operation of the reception section according to the predetermined schedule delayed by the delay section;

    a difference frequency processing section that outputs a difference frequency between the transmission wave and the reflected wave as a detection waveform; and

    a calculation section that calculates a distance to an object on a basis of a delay amount, which the delay section gives to the predetermined schedule, when the detection waveform has a difference frequency between the first frequency and the second frequency.

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