SIGNAL PROCESSOR

• Main Author: OKUDA YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 20.02.2020
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

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 【課題】簡易な構成で精度よく測距をすることが可能な信号処理装置を提供する。【解決手段】第１周波数の第１の正弦波より周波数が低い第２周波数の第２の正弦波を振幅変調した光強度を有するレーザ光の反射光を受光して受信信号を取得する取得部と、受信信号に対し、第１の正弦波に基づく第１の演算及び第１の正弦波とは位相が異なる第３の正弦波に基づく第２の演算を行う第１の演算部２２と、第１又は第２の演算の演算結果に対し、第２の正弦波を演算する第３の演算及び第２の正弦波とは位相が異なる第４の正弦波を演算する第４の演算を行う第２の演算部２３と、演算結果に対する高周波成分の遮断により、受信信号の第１周波数の余弦成分である第１成分、第１周波数の正弦成分である第２成分、第２周波数の余弦成分である第３成分、及び第２周波数の正弦成分である第４成分を検出する信号成分検出部と、を有する。【選択図】図１