A laser radar system

Abstract

The present invention provides a laser radar system, comprising a transmitting module and a scanning module sequentially arranged along a first optical path. The transmitting module comprises a laser transmitting unit and a telecentric lens assembly. The laser transmitting unit comprises a plurality of light sources for transmitting a plurality of laser beams. The telecentric lens assembly is used for respectively collimating each of the plurality of laser beams into parallel beams, and enabling the plurality of parallel beams to be converged along the first optical path and to be incident to the scanning module. The scanning module is used for reflecting the converged parallel beams to a three-dimensional space, and receiving and reflecting an echo beam reflected by a target to be detected. According to the laser radar system of the present invention, laser beams emitted at different angles can be guaranteed to be efficiently collimated and emitted, the emergence efficiency of laser is guaranteed to the maximum extent, and some of laser beams transmitted by the plurality of light sources are protected from being scattered outside the scanning module to form the stray light in the operation process of the laser radar system.

Description

technical field [0001] The invention relates to the technical field of environment perception, in particular to a laser radar system. Background technique [0002] In autonomous driving technology, the environmental perception system is a basic and crucial part, and it is the guarantee of the safety and intelligence of autonomous vehicles. As an important sensor for perceiving surrounding information, on-board lidar has resolution as one of its important parameters. The higher the resolution of lidar, the richer the information, the more conducive to automatic driving decision-making. [0003] The resolution of lidar using scanning mirrors and other scanning methods is often limited by the scanning frequency of the scanning device. In order to further increase the resolution, it can be realized by correspondingly increasing the number of lasers and detectors. At present, the commonly used technical solution is to use the transmitting collimating lens, the collimating lens...

AI Technical Summary

Problems solved by technology

[0005] Since there is a certain distance between the scanning mirror and the collimating lens, different outgoing laser beams will fall on different positions of the scanning mirror. When the size of the scanning mirror is small, some laser beams will fall outside the scanning mirror. On the one hand, it will affect the light extraction efficiency. Affects ranging performance; on the other hand, internal stray light will be formed, resulting in near blind spots

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