Title:
所定領域を移動する受信機の位置管理システム
Document Type and Number:
Japanese Patent JP7239962
Kind Code:
B2
Abstract:
To detect a position of a terminal device at a place where position detection accuracy using a GPS is low or GPS is unavailable.SOLUTION: A plurality of low electric power transmitters 44 are arranged in a prescribed area. Radio field intensity at a place away from each of the low electric power transmitters 44 by a predetermined distance is defined as reference intensity. The reference intensity, an identification code of the low electric power transmitters 44 and position coordinates are registered in a control server 12. A terminal device 16 transmits radio field intensity and an identification code 26 of a radio wave received from the low electric power transmitters 44 to the control server 12. The control server 12 calculates a distance between the terminal device 16 and the low electric power transmitters 44. If an error is smaller than GPS, a position of the low electric power transmitter 44 is determined as a position of the terminal device 16.SELECTED DRAWING: Figure 1
Inventors:
Hirokawa Masakazu
Yuji Ichikawa
Yasuyuki Sato
Fumikatsu Tsuneda
Toshiyuki Furuichi
Yuji Ichikawa
Yasuyuki Sato
Fumikatsu Tsuneda
Toshiyuki Furuichi
Application Number:
JP2018064640A
Publication Date:
March 15, 2023
Filing Date:
March 29, 2018
Export Citation:
Assignee:
IFORCOM Holdings Co., Ltd.
International Classes:
G01S19/48; G01C21/26; G01C21/28; G01S5/14; H04W64/00
Domestic Patent References:
| JP2006267057A | ||||
| JP2017037071A | ||||
| JP2013250083A | ||||
| JP2016024064A | ||||
| JP2013081023A | ||||
| JP2016212035A | ||||
| JP2011019026A | ||||
| JP10260243A |
Foreign References:
| US20120115512 | ||||
| US20030098811 |
Attorney, Agent or Firm:
Yuji Kato