A Lidar and Smart Vehicle

Abstract

The embodiment of the present application provides a laser radar and a smart vehicle, which can be specifically applied in the field of smart vehicles, wherein a laser radar may include: a laser generates a laser signal; a beam shaping module performs collimation processing on the laser signal; a beam splitting module The laser signal is split into beams to obtain the detection signal and the local oscillator signal; the receiving module receives the echo information and transmits the echo signal to the optical mixing module; the optical mixing module performs frequency mixing processing on the local oscillator signal and the echo information to obtain the first A beat frequency signal and a second beat frequency signal; the differential receiving unit performs differential reception on the first beat frequency signal and the second beat frequency signal; the first beat frequency signal and the second beat frequency signal are used to determine the distance or speed of the target object at least one of the . By adopting the embodiment of the present application, the signal can be transmitted through the spatial optical path, and the receiving aperture can be enlarged according to the actual demand, so as to increase the received echo signal.

Description

technical field [0001] The present application relates to the field of radar detection, in particular to a laser radar and an intelligent vehicle. Background technique [0002] Laser radar (LiDAR) is an optical remote sensing technology that obtains target-related information by detecting the scattered light characteristics of the target. LiDAR has high measurement accuracy, fine time and space resolution, and can complete functions such as surveying and mapping, tracking and imaging recognition. It has broad application prospects in the fields of intelligent transportation, automatic driving, atmospheric environment monitoring, geographic mapping, and drones. LiDAR can be mainly divided into three types according to the modulation method: Pulsed LiDAR, AMCW LiDAR and Coherent LiDAR. [0003] For coherent lidar, the laser signal is transmitted with linear frequency modulation. The echo signal formed after the laser signal is reflected by the target is received by the lidar....

AI Technical Summary

Problems solved by technology

[0004] The common laser radar transmits and receives signals through the optical fiber optical path. Due to the limitation of the size of the optical fiber, the energy of the received echo signal will be limited, resulting in low detection accuracy of the laser radar.

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