| CPC G01S 13/282 (2013.01) [G01S 7/282 (2013.01)] | 10 Claims |
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1. A distance measurement device comprising:
a first transceiver;
a second transceiver;
a processor configured to perform a response information acquisition;
a filter; and
a distance calculator, wherein
the first transceiver transmits a first pulse signal to the second transceiver while performing frequency sweeping,
the second transceiver receives the first pulse signal transmitted from the first transceiver,
the response information acquisition acquires response information on a basis of a phase difference obtained by reception of the first pulse signal,
the filter extracts initial response information from the response information, the initial response information being the response information related to the first pulse signal to be received at an initial stage,
the distance calculator calculates group delay on a basis of the initial response information, and calculates a distance between the first transceiver and the second transceiver by multiplying the group delay by a light velocity,
the distance calculator includes a group delay calculator, a frequency selector, and a multiplier,
the group delay calculator calculates a gradient of group delay on a basis of the initial response information,
the frequency selector selects a frequency on a basis of the gradient of the group delay, and
the multiplier calculates the distance by multiplying the group delay at the frequency by the light velocity.
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