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Obstacle detecting apparatus and vehicle occupant protecting device using the same

  • US 5,936,549 A
  • Filed: 06/10/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 06/11/1996
  • Status: Expired due to Fees
First Claim
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1. An obstacle detecting apparatus which detects the distance between an obstacle and a vehicle, the apparatus comprising:

  • two electrical wave radar sensors for measuring the distance between the obstacle and the vehicle;

    collision angle calculating means in which a plurality of positions of the obstacle is calculated via triangulation on the basis of distance information from said two electrical wave radar sensors, and a collision angle, which is formed between the obstacle and the vehicle, is calculated by the locus of the obstacle which is calculated based on said calculated plurality of positions of the obstacle; and

    collision velocity calculating means in which, a collision velocity in the direction of the collision angle is calculated, on the basis of the relative velocity and the angle, of the obstacle with respect to the vehicle, which are detected by said two electrical wave radar sensors, and the collision angle which has been calculated by said collision angle calculating means, said relative velocity being calculated by measuring of Doppler frequency, which is the difference in frequency between a transmitting wave and a receiving wave through a Doppler effect.

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