Two-dimensional multi-beam laser radar rapid scanning device and method based on Blass matrix

Abstract

The invention discloses a two-dimensional multi-beam laser radar rapid scanning device and method based on a Blass matrix. A tunable laser source array is utilized to generate multiple paths of incoherent optical signals, and the phases of the multiple paths of incoherent optical signals are adjusted according to a preset beam direction by controlling a phase shifter in a Blass matrix, so that each path of optical signal has a specific phase difference when reaching each antenna unit, and an optical phased array is formed; and scanning in a dimension parallel to an antenna array plane is realized. The diffraction grating is etched on the waveguide end face of the antenna unit, and the diffraction angle of the diffraction grating is related to the wavelength of an optical signal, so that scanning in a dimension vertical to an antenna array plane can be realized by adjusting the central wavelength of the laser, and rapid scanning in two dimensions is realized. In addition, the rapid scanningdevice has the advantages of being compact in structure, easy to integrate, capable of flexibly expanding the number of beams and the like, and can meet various application requirements.

Description

technical field [0001] The invention is designed in the field of radar detection and imaging. The invention is oriented to the requirement of fast scene scanning laser radar, and proposes a two-dimensional multi-beam laser radar rapid scanning device and method based on Blass matrix. Background technique [0002] With the rapid development of technologies such as automatic driving, bridge collision avoidance, and space rendezvous and docking, it is an important trend to further improve the ranging capability of radar and the accuracy and speed of imaging. However, the traditional microwave imaging radar has problems such as large system volume, wide antenna beam angle, and long imaging time, which will be more limited in the more complex application environment in the future. Lidar with fast ranging and high-resolution imaging capabilities is an excellent choice for this application scenario. [0003] The existing lidar ranging technology is mainly single-beam scanning rang...

AI Technical Summary

Problems solved by technology

Recently, a research has proposed a multi-beam fast scanning method of laser radar based on Butler matrix, but in the above scheme, because the Butler matrix can only meet the limitation of fixed scanning angle, the system has to be in Butler to realize the angular scanning within a certain range. A phase shifter is added after the matrix, which undoubtedly increases the complexity of the system

[0004] In summary, the existing lidar has problems such as ranging, slow imaging and scanning speed, and limited scanning angle.

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