公开(公告)号：US20180356522A1

公开(公告)日：2018-12-13

申请号：US16000261

申请日：2018-06-05

Applicant: TOPCON Corporation

Inventor： Masaho Kikuchi ,  Naoki Shoji ,  Masae Matsumoto

IPC: G01S17/36 ,  G01B9/02

CPC classification number: G01S17/36 ,  G01B9/02004

Abstract: A phase difference frequency generating method comprising: cutting out a reference signal, which is a continuous signal with a predetermined frequency, in a predetermined time and at a predetermined time interval by a signal for intermitting and creating a first intermittent signal, shifting the signal for intermitting by a time corresponding to π/a (a=natural number) of a fundamental frequency of the reference signal, cutting out the reference signal in the predetermined time and at the predetermined time interval by the signal for intermitting as shifted and creating a second intermittent signal, and carrying out a restoration processing for restoring the second intermittent signal by a time as shifted.

公开(公告)号：US11105926B2

公开(公告)日：2021-08-31

申请号：US16000261

申请日：2018-06-05

Applicant: TOPCON Corporation

Inventor： Masaho Kikuchi ,  Naoki Shoji ,  Masae Matsumoto

IPC: G01S17/36 ,  G01B9/02 ,  G01S7/4915 ,  G01S7/4911

Abstract: A phase difference frequency generating method comprising: cutting out a reference signal, which is a continuous signal with a predetermined frequency, in a predetermined time and at a predetermined time interval by a signal for intermitting and creating a first intermittent signal, shifting the signal for intermitting by a time corresponding to π/a (a=natural number) of a fundamental frequency of the reference signal, cutting out the reference signal in the predetermined time and at the predetermined time interval by the signal for intermitting as shifted and creating a second intermittent signal, and carrying out a restoration processing for restoring the second intermittent signal by a time as shifted.