Method for calculating time-of-flight

A method for calculating time-of-flight includes: emitting an acoustic wave by a transmitting sensor; receiving the acoustic wave and converting the received acoustic wave into a received signal by a receiving sensor; performing fast Fourier transform on the received signal to obtain a main frequenc...

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Bibliographische Detailangaben
Hauptverfasser:	LU, CHEN-YUAN, LIN, FU-SUNG, HUANG, CHIH-HSIEN, DU, SHAN-WEN, TSENG, TZU-YI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	A method for calculating time-of-flight includes: emitting an acoustic wave by a transmitting sensor; receiving the acoustic wave and converting the received acoustic wave into a received signal by a receiving sensor; performing fast Fourier transform on the received signal to obtain a main frequency range of the received signal; filtering the received signal to obtain a main signal by a bandpass filter according to the main frequency range; inputting the main signal into a Schmitt-trigger to generate a triggered signal; obtaining a received time point of the acoustic wave according to the triggered signal; and calculating time-of-flight of the acoustic wave according to the received time point and an emitted time point that the transmitting sensor emits the acoustic wave.