公开(公告)号：US20210373156A1

公开(公告)日：2021-12-02

申请号：US17401014

申请日：2021-08-12

Applicant: DENSO CORPORATION

Inventor： Teiyu KIMURA ,  Noriyuki OZAKI ,  Takehiro HATA ,  Mineki SOGA ,  Hiroyuki MATSUBARA ,  Isamu TAKAI

IPC: G01S17/08 ,  G01S17/931 ,  G01S7/4861 ,  G01S7/484

Abstract: An optical distance measuring apparatus comprises a laser diode emitting a light pulse, light receiver including a photon-counting light receiver, distance measurement unit including a signal discriminator and propagation estimator, and threshold determiner. The signal discriminator discriminates the signal component, exceeding a threshold, of the signal as a reflected signal resulting from reflection of the light pulse at a measurement object. The propagation estimator estimates a round-trip propagation time of the light pulse to the measurement object using the signal. The threshold determiner sets a boundary level as the threshold, corresponding to a reference level obtained from the signal when the signal discriminator determines the reflected signal, using the relationship between the reference and the boundary level. The reference level is obtained from the average value of a noise probability distribution in the signal. The boundary level represents a predetermined cumulative probability in the noise probability distribution.