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Microwave sensor for object detection based on reflected microwaves

  • US 7,167,008 B2
  • Filed: 07/08/2005
  • Issued: 01/23/2007
  • Est. Priority Date: 07/09/2004
  • Status: Expired due to Fees
First Claim
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1. A microwave sensor for transmitting a plurality of microwaves of different frequencies toward a detection area and carrying out an object detection operation based on reflected waves of the microwaves from an object present in the detection area, the microwave sensor comprising:

  • a distance identification means for obtaining a relative distance to the object present in the detection area based on the reflected waves;

    a movement-distance identification means for obtaining a movement distance per unit of time of the object present in the detection area; and

    an object determination means for receiving output from the distance identification means and the movement-distance identification means, and carrying out an operation for object detection by setting a movement distance value per unit of time threshold which is a threshold for determining object detection, to a first value corresponding to a movement distance that is very unlikely to occur by plants moving due to wind when the relative distance to the object present in the detection area is less than a predetermined value and by setting the movement distance value per unit of time threshold to a second value smaller than the first value when the relative distance is the predetermined value or greater.

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