Novel high-line-number MEMS laser radar system

Abstract

The invention discloses a novel high-line-number MEMS laser radar system. The system comprises a laser transmitting module which is used for generating laser so as to achieve the laser scanning; a rotary reflection module which is used for adjusting the direction of the laser to project the laser to a to-be-measured object and refracting the reflected laser after the laser is projected to the to-be-measured object; a laser receiving module which comprises a refraction lens group used for receiving the reflected laser and refracting the reflected laser into a target light spot, and a linear array APD provided with a plurality of APD pixels and used for receiving the target light spot, wherein the width of the target light spot is greater than the gap width of two adjacent APD pixels; and adata processing module which is connected with the laser transmitting module and the laser receiving module and is used for measuring the flight time of the laser. According to the invention, the number of APD pixels is not required to be consistent with the number of emitted laser lines, a small number of APD pixels can be selected to realize a high-line-number radar, the number of used elementsis small, the device cost is low, and the application and operation difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a novel high line number MEMS laser radar system. Background technique [0002] Multi-line laser radar generally uses multiple lasers to emit laser light to detect the target's position, speed and other characteristic quantities. Its working principle is to first transmit the detection laser beam to the target, and then receive the signal reflected from the target object and compare it with the transmitted signal. Time-of-flight measurement and signal feature extraction to obtain information about the target. The higher the number of radar lines, the higher the resolution, and the more comprehensive the external information can be obtained, thus creating an urgent demand for high-line number lidar. [0003] At present, the number of lines of mechanical rotary lidar is determined by the number of laser sources LD, and the number of detectors is equal to the number of LDs, and...

AI Technical Summary

Problems solved by technology

When the number of radar lines is high, such as 128-line laser radar, 128 laser sources LD and 128-line detectors APD (avalanche photo diodes, avalanche photodiodes) are required. The number of components is huge, the cost is high, and debugging is difficult

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