Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SIGNAL PROCESSSING FOR OBJECT DETECTION SYSTEM
Document Type and Number:
WIPO Patent Application WO2000075892
Kind Code:
A3
Abstract:
Methods and apparatus for detecting objects are disclosed. In one embodiment of the invention, a person entering a secured or "Safe Zone TM" is illuminated with low-power polarized radio waves. Differently polarized waves which are reflected back from the person are collected and measured. In a preferred embodiment of the invention, concealed weapons are detected by calculating the difference of a pair of differences (Delta A and B) of different polarized reflected energy (upper and lower curves in the two graphs) in the time domain, and by using signal processing methods and apparatus to improve the reliability of the detection process. Alternative embodiments of the invention may be used to detect a wide variety of objects other than concealed firearms. The invention may be used for inventory control or to thwart shoplifting.

Inventors:
CHADWICK GEORGE G (US)
WEAKLEY THOMAS C (US)
Application Number:
PCT/US2000/014509
Publication Date:
March 01, 2001
Filing Date:
May 25, 2000
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SAFE ZONE SYSTEMS INC (US)
CHADWICK GEORGE G (US)
WEAKLEY THOMAS C (US)
International Classes:
G01S7/02; G01S7/41; G01V3/12; G01S7/288; (IPC1-7): G01S13/04
Foreign References:
US5334981A1994-08-02
Other References:
See also references of EP 1203359A4
Download PDF: