Title:
【発明の名称】トランスポンダー検出システム
Document Type and Number:
Japanese Patent JP2677540
Kind Code:
B2
Abstract:
A transponder detection system (50) for detecting the presence at a detection area (22) of a vehicle (100) on which the transponder (3) is mounted. Two antenna arrays (32, 34) are located on opposite sides of the detection area (22), and have their boresights (B) directed to the detection area. For each array, a sum and difference signal of signals received from the transponder are measured. The sum channel signal is used to establish whether a transmission has occurred, and the difference channel signal is used to isolate any transponder that is at the detection area.
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Inventors:
Roger Jay O'Connor
Robert Sea Nittle
Robert Sea Nittle
Application Number:
JP31321295A
Publication Date:
November 17, 1997
Filing Date:
November 30, 1995
Export Citation:
Assignee:
HI Holdings Inc. DBA Hughes Electronics
International Classes:
G01S13/87; H01Q3/34; G07B15/06; H01Q21/06; H04B1/59; H04B7/08; G01S13/44; G01S13/74; G01S13/91; (IPC1-7): H04B1/59; H01Q3/34; H01Q21/06; H04B7/08
Domestic Patent References:
| JP613933A |
Attorney, Agent or Firm:
Takehiko Suzue