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Title:
DUAL−FREQUENCY MICROWAVE SENSOR
Document Type and Number:
WIPO Patent Application WO/2003/038470
Kind Code:
A1
Abstract:
A value of signal level of reflected wave for transmitting a target sensing signal is modified according to a distance to a target as a threshold level, which is set in advance. By recognizing a phase difference of reflected waves from the target and a signal level of the reflected wave from the target, correct one of the distances to two objects caused by a return error which are obtained only by the phase difference is selected according to the signal level of the reflected wave.

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Inventors:
TSUJI MASATOSHI (JP)
Application Number:
PCT/JP2002/011245
Publication Date:
May 08, 2003
Filing Date:
October 29, 2002
Export Citation:
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Assignee:
OPTEX CO LTD (JP)
TSUJI MASATOSHI (JP)
International Classes:
G01N22/00; G01S13/38; G01V3/12; G08B13/16; G01S7/40; (IPC1-7): G01S13/38; G08B13/181; G01V3/12
Foreign References:
JPH01285884A1989-11-16
EP0191510A11986-08-20
JPH08166449A1996-06-25
JP2000338234A2000-12-08
Attorney, Agent or Firm:
Kurauchi, Giro (Nishitemma 4-chome Kita-k, Osaka-shi Osaka, JP)
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