Laser radar and ranging method thereof

Abstract

The invention provides a laser radar, comprising an emission unit which comprises a laser and can emit a plurality of laser beams for target object detection; a receiving unit which comprises a detector array and can receive reflected echoes and convert the echoes into electric signals; and a processing unit which can calculate the distance between a target object and the laser radar according to the electric signals output by the detector array, and outputs the electric signals of part of detectors in the detector array according to a preset mode when a preset condition is met. The invention further provides a method for ranging by using the laser radar. By reducing the line number on the short-distance target object, the problems that the performance of the laser radar for measuring the short-distance target object is reduced and the line number at the near position is redundant are solved. The property that the high-harness laser radar is redundant in the short distance is utilized, when the laser radar is designed, the short-distance measurement performance of part of harnesses is preferentially guaranteed, and when the distance value obtained by measuring the harnesses with poor short-distance performance is within a certain short-distance specific range, the measurement results of the harnesses are not output.

Description

technical field [0001] The present disclosure relates to the field of optoelectronic technology, and in particular to a laser radar and a method for measuring distance by using the laser radar. Background technique [0002] In some laser radars with separate transceivers, the optical axes of the receiving lens group and the transmitting lens group are not coincident (non-coaxial). This optical structure will lead to a decrease in the measurement performance of the laser radar for nearby targets. This problem can only be improved to a certain extent through various optical and other methods, and cannot be completely solved. [0003] As the number of lidar lines increases, the spatial resolution of lidar becomes higher and higher. However, since the different lines of the lidar radiate and diverge, the closer to the lidar, the smaller the distance between the different lines, and even the laser spots of adjacent line beams overlap each other. Therefore, for nearby targets, t...

AI Technical Summary

Problems solved by technology

However, because the different lines of the laser radar are radiating and diverging, the closer the laser radar is, the smaller the distance between the different lines is, and even the laser spots of adjacent line beams overlap each other.

Therefore, for nearby targets, the laser beam projected on it may be too dense, and there is redundancy

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