Patent ID: 11899097
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A distance measurement method of calculating a distance between a first device and a second device, wherein
the first device generates a first reference signal,
the first device transmits a modulated first distance measurement signal, receives a modulated second distance measurement signal, obtains a second demodulated signal through demodulation, and acquires second phase information of the second demodulated signal in a first sampling period based on the first reference signal,
the second device generates a second reference signal independent from the first reference signal,
the second device transmits the second distance measurement signal, receives the first distance measurement signal, obtains a first demodulated signal through demodulation, and acquires first phase information of the first demodulated signal in a second sampling period based on the second reference signal,
a distance between the first device and the second device is calculated based on the first phase information and the second phase information,
one of the first distance measurement signal and the second distance measurement signal is transmitted once or more, and another of the first distance measurement signal and the second distance measurement signal is transmitted twice or more, and
the distance is calculated based on a total of three or more pieces of the first phase information and the second phase information acquired through transmission of the first distance measurement signal and the second distance measurement signal three times or more in total, the first sampling period, and the second sampling period.