Integrated Lidar Based on Nyquist Pulses

Abstract

An integrated laser radar based on Nyquist pulse is characterized in that it includes a Nyquist pulse light source, a circulator, an integrated optical phased array chip with a vertical emission grating, and a control system. The invention has an all-solid-state structure, no mechanical moving parts, and high reliability; the phased array technology ensures a microsecond-level beam scanning speed, and can realize fast beam scanning; when the optical signal is emitted through the vertical grating on the integrated phased array chip , the emission angle is related to the signal wavelength, and the Nyquist pulse has a limited spectral width, so when the optical signal is emitted through the vertical grating, a smaller divergence angle can be obtained, which improves the spatial resolution of the lidar.

Description

technical field [0001] The invention relates to laser radar, in particular to an integrated laser radar based on Nyquist pulse. Specifically, it is an integrated lidar that utilizes the limited spectral width of the Nyquist pulse to achieve a smaller beam divergence angle. Background technique [0002] LiDAR is of great value in areas such as distance measurement and driverless driving. Using lidar ranging can provide distance information of objects in the environment and provide a basis for subsequent decision-making. A typical laser radar technology is based on the pulse time-of-flight scheme: by emitting a laser pulse and measuring the flight time of the laser pulse from being emitted to being reflected by the measured object and finally being received, the measured object distance. [0003] LiDARs based on time-of-flight technology that have been reported so far mainly adopt the following designs: [0004] Method 1: Gaussian light pulses combined with mechanical scan...

AI Technical Summary

Problems solved by technology

However, although the Gaussian optical pulse can obtain a very narrow pulse width, it has a very wide spectrum, resulting in a large divergence angle of the beam emitted by the grating, and cannot obtain a good spatial resolution.

[0006] In short, the above designs are either limited in scanning speed, stability, or beam divergence angle, etc.

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