Laser radar and laser radar control method

Abstract

The embodiment of the invention discloses a laser radar and a laser radar control method. The laser radar comprises two or more than two detection units, each detection unit comprises: one emitter configured to emit an emergent laser; one emitting terminal collimation unit configured to perform collimation of the emergent laser emitted by the emitter; one polarizing beam-splitting unit configuredto allow the emergent laser after collimation to enter from a first light port of the polarizing beam-splitting unit to allow the P polarized light in the emergent laser after collimation to be emergent from the emitting terminal collimation unit; a quarter-wave plate configured to allow the P polarized light emergent from the second light port of the emitting terminal collimation unit to become circular polarized light; and a galvanometric scanner configured to change the emergent direction of the circular polarized light to become the emergent laser. The laser radar and the laser radar control method can enhance the scanning range of the laser radar and improve the resolution and precision of the laser radar.

Description

technical field [0001] The invention relates to the detection field, in particular to a laser radar and a laser radar control method. Background technique [0002] Lidar is a radar system that emits laser beams to detect the position, speed and other characteristic quantities of the target. Its working principle is to first transmit the detection laser beam to the target, and then compare the received signal reflected from the target with the transmitted signal. After proper processing, the relevant information of the target can be obtained, such as target distance, azimuth, height, speed, attitude, and even shape and other parameters. [0003] Lidar usually includes a transmitter, an optical unit at the transmitting end, an optical unit at the receiving end, and a receiver. According to the relative position of the optical axis of the transmitting end and the receiving end, lidar can be divided into two types: off-axis and coaxial. Solid-state laser radar is a kind of las...

AI Technical Summary

Problems solved by technology

Solid-state laser radar is a kind of laser radar. The existing solid-state laser radar mainly adopts the off-axis scheme, but the off-axis scheme also has relatively large defects, such as the receiving field of view is too large and the background noise is large, so the receiver's Higher requirements and higher costs

In addition, the receiving end of the solid-state lidar usually uses a single vibrating mirror to change the angle of the outgoing laser light. Since the scanning range of a single vibrating mirror is limited, the scanning range of the solid-state lidar in the prior art is also limited.

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