Title:
被変調後方散乱通信システムにおけるトランスポンダの方向を判定するための方法および装置
Document Type and Number:
Japanese Patent JP2005503531
Kind Code:
A
Abstract:
Methods and systems for determining the direction to a transponder are disclosed. The methods and systems include transmitting a first signal to an area where communications with a transponder is desired; producing a second signal desired from the first signal; receiving the second signal via a first and second antenna forming a difference signal from the second signal received via the first and second antennas; forming a third signal by adding the second signal received via the first antenna and the second signal received via the third antenna; delaying the difference signal; and comparing a fist polarity of the delayed difference signal with a second polarity of the third signal.
Inventors:
Rand, Jeremy
Application Number:
JP2002502705A
Publication Date:
February 03, 2005
Filing Date:
June 04, 2001
Export Citation:
Assignee:
Transcore Holdings Incorporated
International Classes:
G01S3/46; G01S3/04; G01S3/32; G01S3/38; G01S3/48; G01S13/74; G06K19/07; H04B1/59; (IPC1-7): G01S3/46; G01S3/32; H04B1/59
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita