Title:
【発明の名称】可動物体探索装置
Document Type and Number:
Japanese Patent JP3004051
Kind Code:
B2
Abstract:
A locating system and method in which a network of communication stations are spread over a surveillance area. Each moveable element is provided with a transponder having an associated identification code. A paging signal sent out over the surveillance area is picked up by the transponders and the one with the identification code provided in the page responds. The response is made at a frequency different from the page. The response is picked up by the nearest communication stations. A master station communicates with the communication stations at a frequency different from that used by the paging signal or the transponder. The master station which interrogates all the communication stations locates the paged transponder to within a sector bordered by the communication stations that received the response from the transponder. The communication stations can be subdivided into three or more interspersed arrays.
Inventors:
Vesby, Philip Bee
Application Number:
JP50649691A
Publication Date:
January 31, 2000
Filing Date:
March 27, 1991
Export Citation:
Assignee:
Vesby, Philip Bee
International Classes:
G01S13/74; G08B3/10; G08B21/00; G08B21/24; H04B1/59; H04W60/00; H04W64/00; H04W84/02; (IPC1-7): H04Q7/34
Attorney, Agent or Firm:
Yuzo Yamazaki (2 outside)