US 10,379,136 B2 · Laser radar device

Abstract

The problem with a conventional laser radar device is that the SNR of a value of a wind speed degrades due to motion. A laser radar device according to the present disclosure includes: an optical oscillator to emit laser light; an optical modulator to modulate the laser light generated by the optical oscillator; an optical antenna to emit the laser light modulated by the optical modulator into the air, and to receive, as received light, scattered light scattered by an irradiation target; an optical receiver to perform heterodyne detection on the received light received by the optical antenna; a sensor to detect one or more motion amounts of the optical antenna; and a signal processor to calculate spectra of respective received signals obtained by the heterodyne detection performed by the optical receiver, to correct the spectra by using the one or more motion amounts detected by the sensor, to perform an integration of the corrected spectra, and to calculate a speed of the irradiation target from a spectrum resulting from the integration.

Claims6

Dependent claims

A laser radar device comprising:

an optical oscillator to emit laser light;
an optical modulator to modulate the emitted laser light;
an optical antenna to emit the modulated laser light into air, and to receive, as received light, scattered light scattered by an irradiation target in the air;
an optical receiver to perform heterodyne detection on the received light;
a sensor to detect one or more motion amounts of the optical antenna;
and
a signal processor configured to:
calculate spectra of respective received signals obtained by the heterodyne detection performed by the optical receiver,
correct the calculated spectra by using the one or more motion amounts detected by the sensor,
perform an integration of the corrected spectra, and
calculate a speed of the irradiation target from a spectrum resulting from the integration.

8 more elements

A laser radar device comprising:

an optical oscillator to emit laser light;
an optical modulator to modulate the emitted laser light;
an optical antenna to emit the modulated laser light into air, and to receive, as received light, scattered light scattered by an irradiation target in the air;
an optical receiver to perform heterodyne detection on the received light;
a sensor to detect one or more motion amounts of the optical antenna;
and
a signal processor configured to calculate spectra of respective received signals obtained by the heterodyne detection performed by the optical receiver, correct the calculated spectra by using the one or more motion amounts detected by the sensor, perform an integration of the corrected spectra, and calculate a speed of the irradiation target from a spectrum resulting from the integration,
wherein the signal processor includes:
a range-bin divider to divide the respective received signals into range bins;
a fast Fourier transform processor configured to perform a Fourier transform on received signals in each of the range bins obtained by the range-bin divider to calculate spectra of received signals in the respective range bins;
a correction coefficient calculator to calculate a parameter for projecting a direction of emission of the laser light in a state of motion onto a direction of emission in a state of no motion by using the motion amount detected by the sensor;
a spectrum corrector to correct the spectra calculated by the fast Fourier transform processor, by using the calculated parameter;
an integrator to integrate the corrected spectra with respect to the respective range bins;
and
a wind speed calculator to calculate a Doppler shift component caused by the irradiation target from the integrated and corrected spectra, and calculate a wind speed of the irradiation target from the calculated Doppler shift component.

12 more elements

Dependencies are inferred from the claim text.

Laser radar device

Life of this patent

Laser radar device

Life of this patent

Abstract

Claims6