Title:
DISTANCE ESTIMATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/261139
Kind Code:
A1
Abstract:
A left-direction identification part (30) and a right-direction identification part (29) identify the direction of radio waves transmitted by an electronic key (21). In order to take measures against a relay attack, a distance measurement unit (31) measures distance by means other than received signal strength. Thus, even if the signal strength is amplified by a relay attack, the accuracy of the distance measurement can be maintained. Further, a correction unit corrects the distance, measured by the distance measurement unit (31), from the distance measurement unit (31) to a mobile terminal, on the basis of the identified direction and the mounting position of the distance measurement unit (31).
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Inventors:
TAKASUKA NAOHITO (JP)
SUZUKI YOUICHIRO (JP)
SANJI KENICHIROU (JP)
SUZUKI YOUICHIRO (JP)
SANJI KENICHIROU (JP)
Application Number:
PCT/JP2021/019469
Publication Date:
December 30, 2021
Filing Date:
May 21, 2021
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
E05B49/00; B60R25/24; G01S3/30; G01S13/76
Foreign References:
| DE102018126219A1 | 2020-03-05 | |||
| US20110196580A1 | 2011-08-11 | |||
| JP2014071569A | 2014-04-21 | |||
| JP2020510567A | 2020-04-09 | |||
| JP2016021099A | 2016-02-04 | |||
| JP2018048921A | 2018-03-29 |
Attorney, Agent or Firm:
YAHAGI Kazuyuki et al. (JP)
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