Optical phased array laser radar device

Abstract

The invention discloses an optical phased array laser radar device. The device comprises a laser array light source, a double-layer structure liquid crystal optical switch array, an optical switch scanning control device, a double-structure grating array device, a laser reflection signal processing device and an optical lens; the optical lens comprises a scanning illumination lens and a target reflection receiving lens which are respectively disposed between the double-structure grating array device and an illumination target and between the illumination target and the laser reflection signalprocessing device and are respectively used for correcting an outgoing beam and an incoming beam. According to the optical phased array laser radar device of the invention, common low-power laser diodes are encapsulated into the laser array light source; the specially designed double-layer structure liquid crystal optical switch array is adopted as a beam channel control device to perform phase modulation on laser beams under the control of a gate control device; the unique functions of the specially designed double-structure grating device are utilized to achieve various far-field illumination modes; the laser reflection signal processing device receives and processes of laser signals reflected by the target and calculates information parameters such as distances, azimuths, and velocities.

Description

technical field [0001] The invention relates to the technical field of optical phased array in the field of optical detection, in particular to an optical phased array laser radar device. Background technique [0002] At present, with the rapid development of artificial intelligence technology, target detection, weapon guidance, unmanned driving, autonomous obstacle avoidance and other application fields urgently need a fast, accurate and all-round target detection technology. Radar is the most commonly used detection method. Compared with the radar of traditional mechanical scanning technology, phased array scanning technology uses a large number of independently controlled small antenna units arranged into an antenna array, and each antenna unit is controlled by an independent phase shift switch. By controlling the phases emitted by each antenna element, beams of different phases can be synthesized. Inspired by phase-controlled electronically scanned array radar, solid-st...

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Problems solved by technology

However, solid-state lidar also has its corresponding shortcomings. In addition to the central bright pattern, grating diffraction will also form other bright patterns. This problem will cause the laser to form side lobes outside the direction of maximum power and disperse the energy of the laser; especially for optical phased arrays. It is required that the size of the array unit must not be greater than half a wavelength. Generally, the current working wavelength of the laser radar is about 1 micron, so the size of the array unit must not be greater than 500nm

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