Phase correcting device, distance measuring device, phase fluctuation detecting device and phase correction method

Patent metadata

Field	Value
Publication number	US-11664807-B2
Application number	US-202217670027-A
Country	US
Kind code	B2
Filing date	Feb 11, 2022
Priority date	Mar 19, 2020
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

A phase correcting device includes a local oscillator that includes an all digital phase-locked loop configured to output a local oscillation signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.

First claim

What is claimed is:

1. A distance measuring device that calculates a distance based on carrier phase detection, comprising,
an operation device configured to calculate a distance between a first device and a second device based on phase information acquired from the first device and the second device, at least one of the first device and the second device being movable,
wherein the first device comprises:
a first local oscillator that includes a first all digital phase-locked loop configured to generate a first local oscillation signal based on a first reference clock, and is configured to output the first local oscillation signal;
a first transmitter configured to transmit two or more first carrier signals by using an output of the first local oscillator by a direct modulation method;
a first receiver configured to receive two or more second carrier signals by using an output of the first local oscillator by a heterodyne method;
a first output phase detector included in the first all digital phase-locked loop, and configured to detect a phase of the first local oscillation signal to output the phase of the first local oscillation signal;
a first reference phase device configured to generate a first quasi-reference phase corresponding to a first reference phase of the first local oscillation signal at a time of an initial setting of the first local oscillator to output the first quasi-reference phase, based on the first reference clock; and
a first fluctuation phase detector configured to detect a first fluctuation amount of a phase of the first local oscillator, based on a phase detected by the first output phase detector and the first quasi-reference phase,
the second device comprises:
a second local oscillator that includes a second all digital phase-locked loop configured to generate a second local oscillation signal based on a second reference clock, and is configured to output the second local oscillation signal;
a second transmitter configured to transmit the two or more second carrier signals by using an output of the second local oscillator by a direct modulation method;
a second receiver configured to receive the two or more first carrier signals by using an output of the second local oscillator by a heterodyne method;
a second output phase detector included in the second all digital phase-locked loop, and configured to detect a phase of the second local oscillation signal to output the phase of the second local oscillation signal;
a second reference phase device configured to generate a second quasi-reference phase corresponding to a second reference phase of the second local oscillation signal at a time of an initial setting of the second local oscillator to output the second quasi-reference phase, based on the second reference clock; and
a second fluctuation phase detector configured to detect a second fluctuation amount of a phase of the second local oscillator, based on a phase detected by the second output phase detector, and the second quasi-reference phase,
wherein the first transmitter transmits a first carrier signal of a first low frequency, the first carrier signal of the first low frequency being one of the two or more first carrier signals, the second receiver receives the first carrier signal of the first low frequency from the first transmitter, the second transmitter transmits a second carrier signal of a second low frequency twice, the second carrier signal of the second low frequency being one of the two or more second carrier signals, the first receiver receives the second carrier signal of the second low frequency twice from the second transmitter, the first transmitter transmits the first carrier signal of the first low frequency, the second receiver receives the first carrier signal of the first low frequency from the first transmitter, the first transmitter transmits a first carrier signal of a first high frequency, the first carrier signal of the first high frequency being another one of the two or more first carrier signals, the second receiver receives the first carrier signal of the first high frequency from the first transmitter, the second transmitter transmits a second carrier signal of a second high frequency twice, the second carrier signal of the second high frequency being another one of the two or more second carrier signals, the first receiver receives the second carrier signal of the second high frequency twice from the second transmitter, the first transmitter transmits the first carrier signal of the first high frequency, and the second receiver receives the first carrier signal of the first high frequency from the first transmitter, and
the operation device performs calculation of the distance based on a phase detection result obtained by reception of the first and second carrier signals by the first receiver and the second receiver, and the first fluctuation amount and the second fluctuation amount detected by the first fluctuation phase detector and the second fluctuation phase detector.

2. The distance measuring device according to claim 1 , wherein
the first transmitter performs first transmission of the first carrier signal of the first low frequency at a first time, performs second transmission of the first carrier signal of the first low frequency at a second time, performs first transmission of the first carrier signal of the first high frequency at a third time, and performs second transmission of the first carrier signal of the first high frequency at a fourth time, and
an interval between the third time and the fourth time is equal to an interval between the first time and the second time.

3. A distance measuring method of calculating a distance between a first device and a second device based on phase information acquired from the first device and the second device, at least one of the first device and the second device being movable, the method comprising:
transmitting a first carrier signal of a first low frequency by a first transmitter of the first device;
receiving the first carrier signal of the first low frequency from the first transmitter, by a second receiver of the second device;
transmitting a second carrier signal of a second low frequency twice, by a second transmitter of the second device;
receiving the second carrier signal of the second low frequency twice from the second transmitter, by a first receiver of the first device;
transmitting the first carrier signal of the first low frequency by the first transmitter;
receiving the first carrier signal of the first low frequency from the first transmitter, by the second receiver;
transmitting a first carrier signal of a first high frequency by the first transmitter;
receiving the first carrier signal of the first high frequency from the first transmitter, by the second receiver;
transmitting a second carrier signal of a second high frequency twice, by the second transmitter;
receiving the second carrier signal of the second high frequency twice from the second transmitter, by the first receiver;
transmitting the first carrier signal of the first high frequency by the first transmitter;
receiving the first carrier signal of the first high frequency from the first transmitter, by the second receiver;
giving a local oscillation signal to a device configured to detect a phase of an inputted signal, from a local oscillator including an all digital phase-locked loop configured to generate the local oscillation signal based on a reference clock, the inputted signal being acquired by the first receiver and the second receiver receiving the first and second carrier signals;
detecting a phase of the local oscillation signal to output the phase of the local oscillation signal, by a first phase detector included in the all digital phase-locked loop;
generating a quasi-reference phase corresponding to a reference p

Assignees

• Toshiba Kk
• Toshiba Electronic Devices & Storage Corp

Inventors

• Nishikawa Masaki

Classifications

• H03L2207/50

  All digital phase-locked loop · CPC title

• H03L7/146

  by using digital means for generating the oscillator control signal (H03L7/141, H03L7/143 take precedence) · CPC title

• G01S7/2923

  based on data belonging to a number of consecutive radar periods · CPC title

• G01S13/765

  with exchange of information between interrogator and responder · CPC title

• H03L7/085 Primary

  concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal (H03L7/10 takes precedence; circuits for comparing the phase or frequency of two mutually-independent oscillations H03D13/00) · CPC title