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Radar apparatus for vehicle

  • US 6,124,823 A
  • Filed: 07/01/1999
  • Issued: 09/26/2000
  • Est. Priority Date: 07/03/1998
  • Status: Expired due to Term
First Claim
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1. A radar apparatus for detecting an object around a vehicle, said radar apparatus comprising a transmitter section for radiating a frequency-modulated transmitted wave, a receiver section for receiving a radio wave re-radiated from an object exposed to said transmitted wave and mixing said radio wave received with part of said transmitted wave to obtain beat signals, and a signal processing section for analyzing frequencies of said beat signals to detect said object around the vehicle,wherein a first threshold value and a second threshold value higher than said first threshold value are set as to signal levels of a frequency spectrum of said beat signals, andwherein said signal processing section is arranged to detect said object around the vehicle, using a beat frequency of a signal level over said second threshold value, and to compare said frequency spectrum with said first threshold value in a predetermined frequency range to determine whether there is dirt on said transmitter section or on said receiver section.

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