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Radar apparatus

  • US 7,460,055 B2
  • Filed: 06/01/2007
  • Issued: 12/02/2008
  • Est. Priority Date: 06/02/2006
  • Status: Expired due to Fees
First Claim
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1. A radar apparatus which transmits a spectrum-spread radar wave, receives a reflected wave obtained through reflection of the radar wave off an object, and detects the object from the reflected wave, said radar apparatus comprising:

  • a pseudo-noise code generator which generates a pseudo-noise code;

    a delay device which delays the pseudo-noise code generated by said pseudo-noise code generator;

    an oscillator which generates a high-frequency signal;

    a transmission multiplier, made up of a differential circuit for inputting and outputting a differential signal, to which a high-frequency signal divided for transmission from the high-frequency signal generated by said oscillator is inputted as a transmission differential signal which is the differential signal, and which multiplies a frequency of the transmission differential signal by a predetermined multiplication ratio, the differential signal being made up of a positive-side signal and a negative-side signal;

    a reception multiplier, made up of the differential circuit, to which a high-frequency signal divided for reception from the high-frequency signal generated by said oscillator is inputted as a reception differential signal which is the differential signal, and which multiplies a frequency of the reception differential signal by the same multiplication ratio as with said transmission multiplier;

    a transmitter which generates the radar wave by using the differential signal obtained through the multiplication by said transmission multiplier and the pseudo-noise code generated by said pseudo-noise code generator; and

    a receiver which generates, from the reflected wave, a first demodulated signal and a second demodulated signal by using the differential signal obtained through the multiplication by said reception multiplier and the pseudo-noise code delayed by said delay device, the second demodulated signal having a phase that is orthogonal to the first demodulated signal.

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