US 2026/0266993 A1 · FMCW LIDAR SYSTEM AND FMCW FREQUENCY-SWEEPING METHOD

Abstract

An FMCW LiDAR system and an FMCW frequency-sweeping method are provided. The FMCW frequency-sweeping method includes: acquiring a frequency-sweeping beam which performs within a preset ranging period n times of frequency-rising and n times of frequency-falling according to preset frequency-rising and frequency-falling slopes, n being a positive number, n≥2, a frequency-sweeping bandwidth of the frequency-sweeping beam and a preset total bandwidth meets the following relationship: f=fc/n, fc being the preset total bandwidth, f being the frequency-sweeping bandwidth (S401); splitting the frequency-sweeping beam into a signal beam and a local oscillation beam, wherein waveforms of the signal beam and the local oscillation beam being wholly identical (S403); transmitting the signal beam, the transmitted beam being reflected after encountering an obstacle to generate a reflected beam (S405); and measuring a beat frequency between the local oscillation beam and the reflected beam, to measure the distance of the obstacle (S407).

Claims10

Dependent claims

A Frequency-Modulated Continuous Wave (FMCW) frequency-sweeping method applied to a Llght Detection And Ranging (LiDAR) system, comprising:

obtaining a frequency-sweeping light beam;
splitting the frequency-sweeping light beam into an signal light beam and a local oscillation light beam, wherein frequency modulation waveforms of the signal light beam and the local oscillation light beam are completely same;
transmitting the signal light beam, wherein the transmitted light beam is reflected after encountering an obstacle to generate a reflected light beam;
and
detecting a beat frequency between the local oscillation light beam and the reflected light beam to determine a distance of the obstacle,
wherein the frequency-sweeping light beam performs n times of frequency-rising based on a preset frequency-rising slope and performs n times of frequency-falling based on a preset frequency-falling slope in a preset frequency-sweeping ranging period, wherein n≥2, and a frequency-sweeping bandwidth of the frequency-sweeping light beam and a preset frequency-sweeping total bandwidth meet the following relationship:
f
=
f
c
/
n
wherein fc is the preset frequency-sweeping total bandwidth, and f is the frequency-sweeping bandwidth.

10 more elements

A Frequency-Modulated Continuous Wave (FMCW) Llght Detection And Ranging (LiDAR) system, comprising:

a laser light source configured to generate a frequency-sweeping light beam;
an optical splitter configured to split the frequency-sweeping light beam into a signal light beam and a local oscillation light beam, wherein frequency modulation waveforms of the signal light beam and the local oscillation light beam are completely the same;
an optical transmitter configured to transmit the signal light beam, wherein the transmitted light beam is reflected to generate a reflected light beam after encountering an obstacle;
an optical receiver configured to receive the reflected light beam;
a detector configured to detect a beat frequency between the local oscillation light beam and the reflected light beam to determine a distance of the obstacle,
wherein the frequency-sweeping light beam performs n times of frequency-rising based on a preset frequency-rising slope and performs n times of frequency-falling based on a preset frequency-falling slope in a preset frequency-sweeping ranging period, wherein n≥2, and a frequency-sweeping bandwidth of the frequency-sweeping light beam and a preset frequency-sweeping total bandwidth meet the following relationship:
f
=
f
c
/
n
wherein fc is the preset frequency-sweeping total bandwidth, and f is the frequency-sweeping bandwidth.

10 more elements

Dependencies are inferred from the claim text.

Fmcw lidar system and fmcw frequency-sweeping method

Life of this patent

Fmcw lidar system and fmcw frequency-sweeping method

Life of this patent

Abstract

Claims10