Importance

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Abstract

A microwave sensor transmits a plurality of microwaves of different frequencies toward a detection area and carries out an object detection operation based on reflected waves of the microwaves from an object present in the detection area. The microwave sensor includes a distance identification section for obtaining a relative distance to the object in the detection area, a movement-distance identification section for obtaining a movement distance per unit of time of the object in the detection area, and an object determination section that receives output from the distance identification section and the movement-distance identification section and carries out an operation for determining object detection by setting the movement distance value per unit of time, which is a threshold for determining object detection, smaller for longer relative distances to the object in the detection area.

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First Claim