Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SECURITY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/192597
Kind Code:
A1
Abstract:
A vehicle-mounted system (100) is a security system that authenticates a portable unit (102) to determine validity, phase data acquired from range-finding radiowaves being used to determine validity of communication between the portable unit (102) and a vehicle-mounted device (103). The received phase data of the range-finding radiowaves varies according to the distance from a transmission source. When the vehicle-mounted device (103) and the portable unit (102) are fixed and the vehicle-mounted device (103) and the portable unit (102) have transmitted and received range-finding radiowaves having the same characteristic frequency, vehicle acquisition phase data and terminal acquisition phase data are the same. By using bidirectional phase data, the validity of the communication between the vehicle-mounted device (103) and the portable unit (102) can be determined with good precision.

Inventors:
SAIKI TAKASHI (JP)
SANJI KENICHIROU (JP)
Application Number:
PCT/JP2021/003066
Publication Date:
September 30, 2021
Filing Date:
January 28, 2021
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DENSO CORP (JP)
International Classes:
E05B49/00; B60R25/24; G01S11/02
Foreign References:
JP2019176437A2019-10-10
JP2015040406A2015-03-02
JP2017218723A2017-12-14
JPH11252631A1999-09-17
JP2006118886A2006-05-11
JP2019128341A2019-08-01
JP2020046321A2020-03-26
Attorney, Agent or Firm:
YAHAGI Kazuyuki et al. (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: LINKED DNA PRODUCTION METHOD AND VECTOR COMBINATION FOR USE THEREIN

Next Patent: DISTANCE ESTIMATION DEVICE