Title:
DISTANCE ESTIMATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/192598
Kind Code:
A1
Abstract:
In an in-vehicle system (100), radio waves which are for ranging and to which a phase shift amount from a reference phase is applied are generated by a transmission process unit (302) in accordance with a generation rule. The phase shift amount includes the case where a phase shift is performed and the case where a value corresponding to the absence of a phase shift is (0). Therefore, in the case where the generation rule is not known, there are difficulties in specifying the reference phase. Even if a third party fraudulently obtains communication between a mobile device (102) and an in-vehicle device (103), using an unauthorized device, the reference phase cannot be identified, because the generation rule is not known. A distance estimation unit (307) estimates distances using a combination of a plurality of frequencies, and adopts an estimated distance when the differences between the plurality of estimated distances are within a predetermined range. Therefore, because the distances are estimated using the phases of the plurality of frequencies, erroneous estimation can be inhibited and the accuracy of estimation can be improved.
Inventors:
SAIKI TAKASHI (JP)
Application Number:
PCT/JP2021/003067
Publication Date:
September 30, 2021
Filing Date:
January 28, 2021
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
E05B49/00; G01S11/02
Foreign References:
| JP2019502096A | 2019-01-24 | |||
| JP2004502177A | 2004-01-22 | |||
| JP2006118886A | 2006-05-11 | |||
| JP2019128341A | 2019-08-01 | |||
| JP2020134169A | 2020-08-31 | |||
| JP2020101474A | 2020-07-02 |
Attorney, Agent or Firm:
YAHAGI Kazuyuki et al. (JP)
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