A laser 3D radar device based on code modulation

Abstract

The invention discloses a laser three-dimensional radar device based on coded modulation. A pulsed laser emits a single beam of laser, and collimation, equalization and beam expansion are carried out through a laser plastic unit to form an even line light source. Intensity modulation is carried out on lasers of different coordinates through an optical encoder, and the modulated lasers are irradiated to N*N tested points at a distance through an emission lens and are reflected. Echo lasers are received by an optical filter of narrow linewidth, and after imaging is carried out on the echo lasers which pass through the optical filter of the narrow linewidth through a receiving lens, the echo lasers are transmitted to an array type photoelectric detector through an optical image transmitting array. A signal collecting and processing circuit carries out sampling, storage and demodulation on the echo signal waveforms generated by the array type photoelectric detector to obtain pixel flight time of N*N tested points. Coordinate transformation and three-dimensional image establishment and calibration are carried out on data of a gesture unit to obtain three-dimensional point cloud data of an object to be tested. Compared with an existing three-dimensional radar, the laser three-dimensional radar device based on the coded modulation simplifies a traditional mechanical scanning structure, and is high in precision and good in stability.

Description

technical field [0001] The invention relates to the field of three-dimensional laser radar, in particular to a three-dimensional laser radar device based on code modulation. Background technique [0002] Compared with traditional two-dimensional radar, laser three-dimensional radar can provide more abundant target space information, and is widely used in industrial, military and other fields. [0003] The traditional laser three-dimensional radar emits a single-beam pulsed laser, and then receives the echo laser by a single detector unit, and uses the time of flight of light to measure the distance between the measured object and the radar. In order to realize spatial three-dimensional detection, it is necessary to add a mechanical scanning structure to change the light emitting and receiving directions of the laser. In order to improve the detection accuracy and speed, the repetition rate of the laser and the turnover rate of the mechanical structure must be increased. Th...

AI Technical Summary

Problems solved by technology

[0004] At present, the laser 3D radar based on the time of flight has bottlenecks that are difficult to break through in terms of the size of the detector array, the frequency of the laser, and the scanning speed, accuracy, and stability of the mechanical structure of the scanner.

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