DISTANCE DETECTION DEVICE, DISTANCE DETECTION METHOD, AND PERSISTENT TANGIBLE COMPUTER-READABLE MEDIUM THEREFOR

摘要

A distance detection device (10) for detecting the distance to a target by transceiving sound waves is provided with: a target assessment device (S170) for assessing the existence of a target and the distance to the target by comparing a threshold value set in advance and the level at which reflected waves obtained by transmitted-sound waves being reflected from the target are received; and sensitivity modification devices (S130 to S160) for setting the sensitivity at which the target assessment device obtains reflected waves to be higher after a time that corresponds to a reference distance has elapsed after transmission of the sound waves, the reference distance being within a distance range in which a plurality of targets having different sizes of sound-wave reflection surfaces can be identified.