Distance measuring device and distance measuring method

A distance measuring device that calculates a distance on a basis of carrier phase detection, the distance measuring device comprising a processor configured to calculate, on a basis of phase information acquired by a first device and a second device, at least one of which is movable, a distance between the first device and the second device, wherein

• the first device includes:
• a first reference signal source;
• and
• a first transceiver configured to transmit two or more first carrier signals having frequencies different from each other and receive two or more second carrier signals having frequencies that are the same as the respective frequencies of the two or more first carrier signals using an output of the first reference signal source,
• the second device includes:
• a second reference signal source configured to operate independently from the first reference signal source;
• and
• a second transceiver configured to transmit the two or more second carrier signals and receive the two or more first carrier signals using an output of the second reference signal source,
• the processor calculates the distance by a phase calculation using a phase detection result obtained by reception of the first and second carrier signals having the same frequencies, and
• the first and second reference signal sources continuously operate during a period in which the first and second carrier signals are transmitted and received by the first and second transceivers, and, as a result, respective phases of the first and second carrier signals continuously change.