Laser radar

Abstract

The invention relates to the technical field of radar. The invention discloses laser radar. The laser radar comprises a laser and a receiving system, the laser is used for emitting a laser to a target to be detected, the receiving system is used for receiving a laser reflected by the target to be detected, the receiving system at least comprises a first receiving system and a second receiving system, the first receiving system and the laser are arranged at intervals, the second receiving system is arranged between the first receiving system and the laser, the first receiving system is used for receiving the laser reflected by the target to be detected in a range from a first near point to a first far point, the second receiving system is used for receiving a laser reflected by the target to be detected in a range from a second near point to a second far point, and the distance from the second near point to the laser is less than the distance from the first near point to the laser, is smaller than or equal to the distance from the second far point to the laser and is smaller than the distance from the first far point to the laser. The laser radar has an ultra-small blind area or even has no blind area and can meet the miniaturization requirement.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a laser radar. Background technique [0002] Lidar has the advantages of relatively simple structure, high monochromaticity, high directionality, good coherence, high measurement accuracy, high spatial resolution, long detection distance, and low price; it has been widely used, and its application range is as large as the atmosphere It is an effective method for high-precision remote sensing detection of sea and land, and it is as small as a household intelligent sweeping robot to navigate and avoid obstacles. [0003] At present, the mechanical single-line scanning lidar mostly uses the triangulation method to obtain distance information. The principle of triangulation distance measurement is: the laser emits a beam of collimated laser light, and the light beam irradiates the target to be measured, and diffuse reflection occurs, and the reflected light is received by ...

AI Technical Summary

Problems solved by technology

However, due to the requirement of miniaturization of the structure and the limitation of the resolution of the existing imaging sensor, the focal length f of the lens needs to be kept at a relatively large value, that is, the field of view of the lens is limited and cannot be set too large, resulting in the existing distance measurement based on the triangulation method There is a large blind spot in the lidar ranging of a single lens, which will limit the installation position and functional use of the radar

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