Title:
半導体装置、及び半導体装置を用いた位置検出システム
Document Type and Number:
Japanese Patent JP5121302
Kind Code:
B2
Abstract:
A position detection system is formed by network connection of a plurality of interrogators and a server. An RFID and the interrogators communicate wirelessly, whereby a distance from each interrogator to the RFID is searched to search a position of the RFID from the distance. In order to calculate the distance from the interrogator to the RFID, a signal is oscillated with a frequency corresponding to amplitude of a signal received in the RFID from the interrogator. A frequency of a signal oscillated in the RFID is detected in the RFID or by the interrogator, whereby a distance from the interrogator to the RFID is detected.
Inventors:
Hiroshi Muho
Yoshimoto Kurokawa
Takuyuki Inoue
Yoshimoto Kurokawa
Takuyuki Inoue
Application Number:
JP2007132180A
Publication Date:
January 16, 2013
Filing Date:
May 17, 2007
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
G01S11/06; G01S11/02; G01S13/75; G01S13/76; G01S13/79; G06K17/00; G06K19/07; H04B5/02
Domestic Patent References:
| JP2005092343A | ||||
| JP1102693A | ||||
| JP2004271458A | ||||
| JP6325229A |