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

Patent metadata

Field	Value
Publication number	US-11277139-B2
Application number	US-202017018039-A
Country	US
Kind code	B2
Filing date	Sep 11, 2020
Priority date	Mar 19, 2020
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

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 phase correcting device, comprising:
a local oscillator that includes an all digital phase-locked loop configured to generate a local oscillation signal based on a reference clock, and is configured to give the local oscillation signal to a device configured to detect a phase of an inputted signal;
a first phase detector included in the all digital phase-locked loop, and 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 at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on the 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.

2. The phase correcting device according to claim 1 ,
wherein the first phase detector includes a first integrator configured to be given frequency control data for designating a multiplication number of the local oscillation signal, and
the reference phase device includes a second integrator configured to be given frequency control data for designating a multiplication number of the local oscillation signal at the time of the initial setting of the local oscillator.

3. The phase correcting device according to claim 2 ,
wherein the second phase detector includes a first subtractor configured to obtain a difference between an output of the first integrator and an output of the second integrator.

4. The phase correcting device according to claim 3 ,
wherein the second phase detector comprises
hold circuits configured to hold outputs of the first subtractor at predetermined two timings different from each other, and
a second subtractor configured to obtain a difference between the outputs of the first subtractor that are held at the two timings.

5. The phase correcting device according to claim 1 ,
wherein the all digital phase-locked loop comprises the first phase detector, a digital control oscillator configured to control a frequency by digital control based on frequency control data, a counter circuit and a time-digital conversion circuit configured to obtain a phase of the local oscillation signal from the digital control oscillator with a phase of the reference clock as a reference, and a subtractor configured to obtain a difference of outputs of the first phase detector that is given the frequency control data, and the counter circuit and the time-digital conversion circuit to control the digital control oscillator based on a difference result, and
the first phase detector gives an output at a time of lock of the all digital phase-locked loop to the second phase detector as a detection result of the phase of the local oscillation signal.

6. 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, and
the operation device performs calculation of the distance based on a phase detection result obtained by reception of the first carrier signal and the second carrier signal 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.

7. A phase fluctuation detecting device, comprising:
a local oscillator that includes an all digital phase-locked loop configured to generate a local oscillation signal based on a reference clock, and is configured to give the local oscillation signal to a device configured to detect a phase of an inputted signal;
a first phase detector included in the all digital phase-locked loop, and 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 at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on the reference clock; and
a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on a phase detected by the first phase detector and the quasi-reference phase.

8. A phase correction method, comprising:
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;
detecting a phase of the local oscillation signal to o

Assignees

• Toshiba Kk
• Toshiba Electronic Devices & Storage Corp

Inventors

• Nishikawa Masaki

Classifications

• 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

• G01S7/4008

  of transmitters · CPC title

• G01S13/345

  using triangular modulation · CPC title

• G01S7/282

  Transmitters · CPC title

• H03L2207/50

  All digital phase-locked loop · CPC title