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Frequency-modulated continuous wave laser radar system and laser radar scanning method

A frequency-modulated continuous wave and laser radar technology, applied in the field of measurement, can solve the problem of reduced coupling between the echo signal and the receiving device

Pending Publication Date: 2021-05-07
BENEWAKE BEIJING TECH CO LTD
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Problems solved by technology

[0004] In view of this, the embodiment of the present application provides a frequency-modulated continuous wave laser radar system and a laser radar scanning method, which is convenient to improve the problem of reduced coupling between the echo signal and the receiving device caused by the time of flight

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  • Frequency-modulated continuous wave laser radar system and laser radar scanning method

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Embodiment Construction

[0031] Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0032] It should be clear that the embodiments described herein are only some of the embodiments of the application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0033] The FMCW lidar system is different from the pulse radar to measure the flight time of the pulse, and is essentially a heterodyne interferometry device. The light source uses a narrow linewidth laser, and through internal modulation or external modulation, the wavelength of the laser is linearly changed, thereby realizing the linear modulation of the laser frequency. The modulated laser light is divided into two paths, one path is local oscillator light, and the other path is signal light. Use an optical a...

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Abstract

The embodiment of the invention discloses a frequency-modulated continuous wave laser radar system and a laser radar scanning method, relates to the technical field of measurement, and aims to solve the problem that the coupling between an echo signal and a receiving device is reduced due to flight time. The frequency-modulated continuous wave laser radar system comprises: a frequency modulation device which carries out frequency modulation on laser emitted by a laser; an interference device which divides the laser subjected to frequency modulation into local oscillation light and signal light, wherein the signal light is emitted by an optical waveguide and then is scanned and emitted by at least two wedge-shaped mirrors in a wedge-shaped mirror scanning device in sequence, and the interference device interferes the signal light reflected by a target with the local oscillation light to generate a beat frequency signal; and a signal receiving and processing device used for converting the beat frequency signal into an electric signal, processing the converted electric signal, obtaining a frequency component in the beat frequency signal, and calculating a measurement result according to the frequency component. The system and the method in the embodiment of the invention can be applied to measurement of medium and long distances.

Description

technical field [0001] The present application relates to the field of measurement technology, in particular to a frequency-modulated continuous wave laser radar system and a laser radar scanning method. Background technique [0002] Frequency Modulation Continuous Wave Lidar (FMCWLidar) is essentially heterodyne interferometry. The principle is to linearly modulate the laser frequency and divide the laser into two, one for local oscillator light and one for signal light. It shoots straight out and is reflected by the target into the receiving system, and interferes with the local oscillator light to generate a beat frequency signal. The signal carries the frequency tuning amount generated by the time of flight and the Doppler frequency shift generated by relative motion, and the beat frequency is measured to calculate the distance. and speed information. [0003] At present, the scanning mechanism in the FMCW lidar system is mainly based on reflection methods such as vibra...

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Application Information

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IPC IPC(8): G01S7/481G01S17/34G01S17/58
CPCG01S7/4817G01S17/34G01S17/58
Inventor 疏达李鲲杨野李远
Owner BENEWAKE BEIJING TECH CO LTD
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