To provide a ranging device capable of appropriately measuring even a range affected by reverberation.SOLUTION: A ranging device includes: a transmission/reception part for transmitting transmission waves as ultrasonic waves and receiving reflection waves generated by the transmission waves; a detection part for detecting reception signals received by the transmission/reception part and obtaining a reception waveform for showing a time change in strength of reception signals; a feature amount detection part for detecting a feature amount of reflection waves on the basis of a reception waveform; a measurement distance calculation part for calculating a distance from the ranging device to an object as a measurement distance; a detection condition control part for controlling a detection condition of detection of a feature amount; and an output control part for outputting a measurement distance. The detection condition control part adjusts a detection condition by changing a threshold for detecting a feature amount on the basis of a ranging distance in conformity with transition of a feature amount when reflection waves arrive during a reverberation period in which reverberation of transmission waves remain in the transmission/reception part.SELECTED DRAWING: Figure 7

    【課題】残響の影響のある範囲でもより適切に距離を計測することができる測距装置を提供する。【解決手段】本開示の測距装置では、超音波である送信波の送信、及び、送信波によって生じた反射波の受信を行う送受信部と、送受信部が受信した受信信号を検波して受信信号の強度の時間変化を示す受信波形を得る検波部と、受信波形に基づいて、反射波の特徴量を検出する特徴量検出部と、特徴量に基づいて、測距装置から物体までの距離を測定距離として算出する測定距離算出部と、特徴量の検出の検出条件を制御する検出条件制御部と、測定距離を出力する出力制御部と、を備え、検出条件制御部は、送受信部に送信波の残響が残存している残響期間中に反射波が到達する場合には、特徴量の推移に基づいて、特徴量の検出の閾値を測距距離に基づいて変更することで、検出条件を調整する。【選択図】図7


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    Title :

    RANGING DEVICE


    Additional title:

    測距装置


    Contributors:

    Publication date :

    2022-10-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01S RADIO DIRECTION-FINDING , Funkpeilung / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS



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