Title:
PORTABLE MACHINE POSITION ESTIMATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/031550
Kind Code:
A1
Abstract:
In this portable machine position estimation system, an in-vehicle system is provided with: a transmitter/receiver (12X); a plurality of listening machines (12A, 12B, 12C); and a position estimation unit (11). The position estimation unit identifies a first propagation time, which is the propagation time of a wireless signal from the transmitter/receiver to a portable machine, on the basis of a roundtrip time, which is the time from transmission of a response request signal by the transmitter/receiver until the transmitter/receiver receives a response signal from the portable machine. The position estimation unit identifies a second propagation time, which is the propagation time of a wireless signal from the portable machine to the listening machines, on the basis of: the roundtrip time; and a signal reception interval which is the time from reception of the response request signal by the listening machines until reception of the response signal.
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Inventors:
KUSUMOTO TETSUYA (JP)
SANJI KENICHIRO (JP)
SHINODA TAKASHI (JP)
SANJI KENICHIRO (JP)
SHINODA TAKASHI (JP)
Application Number:
PCT/JP2019/026012
Publication Date:
February 13, 2020
Filing Date:
July 01, 2019
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
B60R25/24; E05B49/00; G01S5/14; G01S13/76
Domestic Patent References:
| WO2009145325A1 | 2009-12-03 |
Foreign References:
| JP2017173256A | 2017-09-28 |
Attorney, Agent or Firm:
JIN Shunji (JP)
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