Title:
無線タグ移動検知装置
Document Type and Number:
Japanese Patent JP6881198
Kind Code:
B2
Abstract:
Provided is a configuration for detection of a movement state of a radio tag using a phase difference of a response wave from the radio tag. A phase (Õ[i]) and a measurement time (t[i]) of a response wave from a radio tag (30) measured by using a communication processing part (13) are sequentially stored in a memory (12). A difference from a previous phase and a difference from a previous measurement time with respect to each phase (Õ[i]) stored in the memory (12) are calculated as a phase difference (Õ[i]) and a time difference (t[i]). A phase addition value (cpsum[i]) obtained by cumulatively adding a plurality of the phase differences (Õ[i]) is calculated so as to correct a phase difference in which the corresponding time difference (t[i]) among the calculated plurality of the phase differences (Õ[i]) exceeds a time threshold tsa ([i]), whereby the movement state of the radio tag (30) is detected based upon the calculated phase addition value Õsum[i]. A required time when a phase is changed by À is obtained by a movement distance and a movement average speed of the radio tag (30), and the time threshold (tsa[i]) is set to be equal to or less than half of the required time.
Inventors:
Enomoto Kohei
Masayuki Ogawa
Masuda Yusuke
Masayuki Ogawa
Masuda Yusuke
Application Number:
JP2017189510A
Publication Date:
June 02, 2021
Filing Date:
September 29, 2017
Export Citation:
Assignee:
Denso Wave Co., Ltd.
International Classes:
G01S13/84; G06K7/10
Domestic Patent References:
| JP2006260062A | ||||
| JP2008514920A | ||||
| JP63502132A |
Attorney, Agent or Firm:
Akito Tashita
Katsuhiko Tateishi
Katsuhiko Tateishi