Title:
SIGNAL PROCESSOR
Document Type and Number:
Japanese Patent JP2020027034
Kind Code:
A
Abstract:
To provide a signal processor capable of highly precisely measuring a distance in a simple configuration.SOLUTION: The signal processor includes: an acquisition unit that acquires a reception signal by receiving reflected light of a laser beam having light intensity modulated in amplitude of a second sine wave of a second frequency that is lower than a first sine wave of a first frequency; a first computing unit 22 that performs a first computation of the reception signal on the basis of the first sine wave and a second computation on the basis of a third sine wave having a different phase from that of the first sine wave; a second computing unit 23 that, regarding the computation result of the first or second computation, performs a third computation of computing the second sine wave and a fourth computation of computing a fourth sine wave that has a different phase from that of the second sine wave; and a signal component detection unit that, by cutting off high-frequency components of the computation results, detects a first component that is a cosine component of the first frequency of the reception signal, a second component that is a sine component of the first frequency, a third component that is a cosine component of the second frequency, and a fourth component that is a sine component of the second frequency.SELECTED DRAWING: Figure 1
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Inventors:
OKUDA YOSHIYUKI
Application Number:
JP2018152036A
Publication Date:
February 20, 2020
Filing Date:
August 10, 2018
Export Citation:
Assignee:
PIONEER ELECTRONIC CORP
International Classes:
G01S17/36
Domestic Patent References:
| JPH11118928A | 1999-04-30 | |||
| JPS6469983A | 1989-03-15 | |||
| JP2012048366A | 2012-03-08 | |||
| JP2001264014A | 2001-09-26 |
Foreign References:
| US20140168004A1 | 2014-06-19 |
Attorney, Agent or Firm:
Patent Business Corporation Lexto International Patent Office