Mobile object detection method and detection system

• US 20070132582A1
• Filed: 12/11/2006
• Published: 06/14/2007
• Est. Priority Date: 12/13/2005
• Status: Abandoned Application

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Inventors: Itoh, Hideo, Kaji, Ryosaku
• Application Number:
  US11/636,940
• Publication Number:
  US 20070132582A1
• Time in Patent Office: Days
• US Class Current: 340/561
• CPC Class Codes: G08B 13/2491 Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Abstract

The present invention provides a mobile object detection method, and a mobile object detection system, that allow detecting the movement of an object based on measurements of the electric field intensity generated by transmitters such as IC tags, while curbing implementation costs. Movement of the object is detected by measuring electric field intensity generated by a plurality of transmitters arranged in a detection space, obtaining a difference between the electric field intensity and an average value of the electric field intensity in a state where an object in the detection space is not moving, and detecting the movement of the object when the difference is equal to or larger than a threshold value based on a standard deviation of the electric field intensity in a state where the object in the detection space is not moving.

Claims

1. A mobile object detection method, comprising:

measuring electric field intensity generated by a plurality of transmitters arranged in a detection space;

obtaining a difference between the electric field intensity and an average value of the electric field intensity in a state where an object in the detection space is not moving; and

detecting the movement of the object when the difference is equal to or larger than a threshold value based on a standard deviation of the electric field intensity in a state where the object in the detection space is not moving.

2. A mobile object detection system, comprising:

means for measuring electric field intensity generated by a plurality of transmitters arranged in a detection space; and

means for obtaining a difference between the electric field intensity and an average value of the electric field intensity in a state where an object in the detection space is not moving, and detecting the movement of the object when the difference is equal to or larger than a threshold value based on a standard deviation of the electric field intensity in a state where the object in the detection space is not moving.