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Method and apparatus for measuring position of object for vehicle

  • US 6,433,856 B1
  • Filed: 09/14/2000
  • Issued: 08/13/2002
  • Est. Priority Date: 11/10/1999
  • Status: Expired due to Fees
First Claim
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1. A method for measuring a position of an object employing at least two separate optical radar units separated by a distance, wherein each optical radar unit can emit light pulses in a direction and receive light pulses coming from the same direction as the emitted light beam, comprising:

  • setting the two separate optical radar units such that the two separate optical radar units are directed to a point;

    emitting a light pulse to the point at time t by one of the two optical radar units, which is called the first optical radar unit and detecting the light pulse reflected from the point by the other optical radar unit, which is called the second optical radar unit;

    switching the functions of the two optical radar units after a switching time interval dt such that the second optical radar unit emits a light pulse to the point at time t+dt and the first optical radar unit detects the light pulse reflected from the point;

    comparing the two signals detected by the first and the second optical radar units to determine whether the time difference of the two detected signals is the switching time interval dt;

    determining the position of the point on the basis of the two directions and the separation of the two optical radar units;

    displaying the result of the comparison of the two detected signals at the position of the point to determine whether an object is at the point and to measure the position of the object if the object is at the point; and

    scanning a predetermined area by changing the two directions of the two optical radar units.

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