Title:
RECEPTION SIGNAL INTENSITY MEASURING DEVICE, RECEPTION SIGNAL INTENSITY MEASURING METHOD, PROGRAM, AND KEYLESS ENTRY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/070219
Kind Code:
A1
Abstract:
In the present invention, a signal intensity acquiring unit acquires, as the first signal intensity, a reception signal intensity at a receiving unit during a first time period in which an object signal is transmitted, and acquires, as the second signal intensity, a reception signal intensity at the receiving unit during a second time period in which no object signal is transmitted. A signal intensity calculating unit calculates, when a variance value of the second signal intensity exceeds a first threshold, the reception signal intensity of an object signal by a first calculation method based on an assumption that a noise signal, the amplitude of which varies, is superposed on the object signal, and calculates, when the variance value of the second signal intensity N is lower than the first threshold, the reception signal intensity of the object signal by a second calculation method based on an assumption that a noise signal the frequency and the amplitude of which are fixed is superposed on the object signal.
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Inventors:
MIYAZAWA AKIRA (JP)
Application Number:
PCT/JP2017/034322
Publication Date:
April 19, 2018
Filing Date:
September 22, 2017
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD (JP)
International Classes:
G01S11/06; B60R25/24; E05B49/00; H04B17/318
Foreign References:
| JP2013194439A | 2013-09-30 | |||
| JP2005325540A | 2005-11-24 | |||
| JP2010181295A | 2010-08-19 | |||
| US20140180498A1 | 2014-06-26 | |||
| US20090121858A1 | 2009-05-14 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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